{"id":37734,"date":"2026-01-08T11:23:26","date_gmt":"2026-01-08T04:23:26","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=37734"},"modified":"2026-01-08T11:23:26","modified_gmt":"2026-01-08T04:23:26","slug":"certificate-authority-ca-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/","title":{"rendered":"Certificate Authority l\u00e0 g\u00ec? Vai tr\u00f2, C\u00e1c lo\u1ea1i &#038; Ti\u00eau ch\u00ed ch\u1ecdn"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed8I DUNG<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Certificate-Authority-la-gi\" >Certificate Authority l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Vai-tro-va-tam-quan-trong-cua-CA-trong-bao-mat-mang\" >Vai tr\u00f2 v\u00e0 t\u1ea7m quan tr\u1ecdng c\u1ee7a CA trong b\u1ea3o m\u1eadt m\u1ea1ng<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Nen-tang-cua-SSLTLS\" >N\u1ec1n t\u1ea3ng c\u1ee7a SSL\/TLS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Xac-thuc-danh-tinh-Authentication\" >X\u00e1c th\u1ef1c danh t\u00ednh (Authentication)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Bao-mat-du-lieu-Encryption\" >B\u1ea3o m\u1eadt d\u1eef li\u1ec7u (Encryption)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Toan-ven-du-lieu-Data-Integrity\" >To\u00e0n v\u1eb9n d\u1eef li\u1ec7u (Data Integrity)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Cac-loai-Certificate-Authority-pho-bien-hien-nay\" >C\u00e1c lo\u1ea1i Certificate Authority ph\u1ed5 bi\u1ebfn hi\u1ec7n nay<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Public-CA-CA-cong-cong\" >Public CA (CA c\u00f4ng c\u1ed9ng)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Private-CA-CA-noi-bo\" >Private CA (CA n\u1ed9i b\u1ed9)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Free-CA-va-Paid-CA-%E2%80%93-nen-chon-loai-nao\" >Free CA v\u00e0 Paid CA \u2013 n\u00ean ch\u1ecdn lo\u1ea1i n\u00e0o?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Cac-thanh-phan-trong-he-thong-Certificate-Authority\" >C\u00e1c th\u00e0nh ph\u1ea7n trong h\u1ec7 th\u1ed1ng Certificate Authority<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Root-CA-CA-goc\" >Root CA (CA g\u1ed1c)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Intermediate-CA-CA-trung-gian\" >Intermediate CA (CA trung gian)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Chuoi-tin-cay-Chain-of-Trust\" >Chu\u1ed7i tin c\u1eady (Chain of Trust)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Certificate-Authority-va-SSL-khac-nhau-nhu-the-nao\" >Certificate Authority v\u00e0 SSL kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Top-cac-to-chuc-SSL-CA-uy-tin-hien-nay\" >Top c\u00e1c t\u1ed5 ch\u1ee9c\u00a0SSL CA uy t\u00edn hi\u1ec7n nay<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Tren-the-gioi\" >Tr\u00ean th\u1ebf gi\u1edbi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Tai-Viet-Nam\" >T\u1ea1i Vi\u1ec7t Nam<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Cac-loai-chung-chi-so-pho-bien-do-Certificate-Authority-CA-cap\" >C\u00e1c lo\u1ea1i ch\u1ee9ng ch\u1ec9 s\u1ed1 ph\u1ed5 bi\u1ebfn do Certificate Authority (CA) c\u1ea5p<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Chung-chi-Domain-Validation-DV\" >Ch\u1ee9ng ch\u1ec9 Domain Validation (DV)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Chung-chi-Organization-Validation-OV\" >Ch\u1ee9ng ch\u1ec9 Organization Validation (OV)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Chung-chi-Extended-Validation-EV\" >Ch\u1ee9ng ch\u1ec9 Extended Validation (EV)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Chung-chi-Multi-domain-SANUCC\" >Ch\u1ee9ng ch\u1ec9 Multi-domain (SAN\/UCC)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Chung-chi-Wildcard-SSL\" >Ch\u1ee9ng ch\u1ec9 Wildcard SSL<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Chung-chi-Code-Signing\" >Ch\u1ee9ng ch\u1ec9 Code Signing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Chung-chi-SMIME\" >Ch\u1ee9ng ch\u1ec9 S\/MIME<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Tieu-chi-lua-chon-nha-cung-cap-CA-uy-tin\" >Ti\u00eau ch\u00ed l\u1ef1a ch\u1ecdn nh\u00e0 cung c\u1ea5p CA uy t\u00edn<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Chinh-sach-bao-mat-ho-tro-ky-thuat\" >Ch\u00ednh s\u00e1ch b\u1ea3o m\u1eadt &amp; h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Tuong-thich-voi-CAA-Record-he-thong-DNS\" >T\u01b0\u01a1ng th\u00edch v\u1edbi CAA Record &amp; h\u1ec7 th\u1ed1ng DNS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Muc-do-pho-bien-cua-Certificate-Authority\" >M\u1ee9c \u0111\u1ed9 ph\u1ed5 bi\u1ebfn c\u1ee7a Certificate Authority<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Cac-bien-phap-bao-mat-do-Certificate-Authority-cung-cap\" >C\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt do Certificate Authority cung c\u1ea5p<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Do-tin-cay-cua-trinh-duyet\" >\u0110\u1ed9 tin c\u1eady c\u1ee7a tr\u00ecnh duy\u1ec7t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Muc-do-xac-thuc\" >M\u1ee9c \u0111\u1ed9 x\u00e1c th\u1ef1c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Dich-vu-ho-tro-va-Chi-phi\" >D\u1ecbch v\u1ee5 h\u1ed7 tr\u1ee3 v\u00e0 Chi ph\u00ed<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Huong-dan-dang-ky-chung-chi-SSL-thong-qua-Certificate-Authority\" >H\u01b0\u1edbng d\u1eabn \u0111\u0103ng k\u00fd ch\u1ee9ng ch\u1ec9 SSL th\u00f4ng qua Certificate Authority<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Cau-hoi-thuong-gap-ve-Certificate-Authority-FAQ\" >C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 Certificate Authority (FAQ)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Certificate-Authority-co-bat-buoc-khong\" >Certificate Authority c\u00f3 b\u1eaft bu\u1ed9c kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Website-khong-co-CA-thi-dieu-gi-xay-ra\" >Website kh\u00f4ng c\u00f3 CA th\u00ec \u0111i\u1ec1u g\u00ec x\u1ea3y ra?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Co-the-tu-tao-CA-khong\" >C\u00f3 th\u1ec3 t\u1ef1 t\u1ea1o CA kh\u00f4ng?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/#Phan-ket-luan\" >Ph\u1ea7n k\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<p>Khi truy c\u1eadp m\u1ed9t website c\u00f3 bi\u1ec3u t\u01b0\u1ee3ng \u1ed5 kh\u00f3a v\u00e0 giao th\u1ee9c HTTPS, b\u1ea1n \u0111ang s\u1eed d\u1ee5ng m\u1ed9t k\u1ebft n\u1ed1i \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c v\u00e0 b\u1ea3o m\u1eadt. \u0110\u1ee9ng sau c\u01a1 ch\u1ebf n\u00e0y l\u00e0 Certificate Authority (CA) \u2013 t\u1ed5 ch\u1ee9c ch\u1ecbu tr\u00e1ch nhi\u1ec7m x\u00e1c minh danh t\u00ednh v\u00e0 ph\u00e1t h\u00e0nh ch\u1ee9ng ch\u1ec9 s\u1ed1 cho website. V\u1eady <a href=\"https:\/\/interdata.vn\/blog\/certificate-authority-ca-la-gi\/\"><strong>Certificate Authority l\u00e0 g\u00ec<\/strong><\/a>, CA \u0111\u00f3ng vai tr\u00f2 nh\u01b0 th\u1ebf n\u00e0o trong h\u1ec7 th\u1ed1ng b\u1ea3o m\u1eadt Internet? B\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 kh\u00e1i ni\u1ec7m, vai tr\u00f2 c\u1ee7a CA, ph\u00e2n lo\u1ea1i, c\u00e1c lo\u1ea1i ch\u1ee9ng ch\u1ec9 s\u1ed1 ph\u1ed5 bi\u1ebfn do Certificate Authority (CA) c\u1ea5p c\u0169ng nh\u01b0 c\u00e1ch l\u1ef1a ch\u1ecdn nh\u00e0 cung c\u1ea5p ch\u1ee9ng ch\u1ec9 ph\u00f9 h\u1ee3p.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Certificate-Authority-la-gi\"><\/span>Certificate Authority l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Certificate Authority<\/strong> (vi\u1ebft t\u1eaft l\u00e0 CA), hay c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 nh\u00e0 cung c\u1ea5p ch\u1ee9ng th\u1ef1c s\u1ed1, l\u00e0 m\u1ed9t th\u1ef1c th\u1ec3 th\u1ee9 ba trung gian \u0111\u01b0\u1ee3c tin c\u1eady, ch\u1ecbu tr\u00e1ch nhi\u1ec7m x\u00e1c th\u1ef1c danh t\u00ednh c\u1ee7a website, doanh nghi\u1ec7p ho\u1eb7c h\u1ec7 th\u1ed1ng v\u00e0 ph\u00e1t h\u00e0nh ch\u1ee9ng ch\u1ec9 s\u1ed1 (SSL\/TLS Certificate) \u0111\u1ec3 b\u1ea3o \u0111\u1ea3m an to\u00e0n trong qu\u00e1 tr\u00ecnh truy\u1ec1n d\u1eef li\u1ec7u tr\u00ean Internet.<\/p>\n<figure id=\"attachment_37736\" aria-describedby=\"caption-attachment-37736\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37736\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Certificate-Authority-la-gi.jpg\" alt=\"Certificate Authority l\u00e0 g\u00ec?\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Certificate-Authority-la-gi.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Certificate-Authority-la-gi-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Certificate-Authority-la-gi-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-37736\" class=\"wp-caption-text\">Certificate Authority l\u00e0 g\u00ec?<\/figcaption><\/figure>\n<p>\u0110\u1ec3 h\u00ecnh dung \u0111\u01a1n gi\u1ea3n, b\u1ea1n c\u00f3 th\u1ec3 v\u00ed d\u1ee5 minh h\u1ecda CA gi\u1ed1ng nh\u01b0 &#8220;C\u1ee5c Qu\u1ea3n l\u00fd Xu\u1ea5t nh\u1eadp c\u1ea3nh&#8221; ho\u1eb7c m\u1ed9t &#8220;V\u0103n ph\u00f2ng c\u00f4ng ch\u1ee9ng&#8221; tr\u00ean m\u00f4i tr\u01b0\u1eddng internet.<\/p>\n<ul>\n<li><strong>Ngo\u00e0i \u0111\u1eddi th\u1ef1c<\/strong>: Khi b\u1ea1n mu\u1ed1n xu\u1ea5t ngo\u1ea1i, b\u1ea1n c\u1ea7n H\u1ed9 chi\u1ebfu \u0111\u1ec3 ch\u1ee9ng minh danh t\u00ednh. C\u1ee5c Qu\u1ea3n l\u00fd Xu\u1ea5t nh\u1eadp c\u1ea3nh l\u00e0 \u0111\u01a1n v\u1ecb x\u00e1c minh h\u1ed3 s\u01a1 v\u00e0 c\u1ea5p cu\u1ed1n H\u1ed9 chi\u1ebfu \u0111\u00f3 cho b\u1ea1n.<\/li>\n<li><strong>Tr\u00ean m\u00f4i tr\u01b0\u1eddng m\u1ea1ng<\/strong>: Khi m\u1ed9t website mu\u1ed1n ch\u1ee9ng minh n\u00f3 an to\u00e0n v\u00e0 ch\u00ednh ch\u1ee7, website \u0111\u00f3 c\u1ea7n m\u1ed9t Ch\u1ee9ng th\u01b0 s\u1ed1 (SSL\/TLS). T\u1ed5 ch\u1ee9c CA ch\u00ednh l\u00e0 \u0111\u01a1n v\u1ecb x\u00e1c minh th\u00f4ng tin ch\u1ee7 s\u1edf h\u1eefu v\u00e0 c\u1ea5p Ch\u1ee9ng th\u01b0 s\u1ed1 n\u00e0y.<\/li>\n<\/ul>\n<p>S\u1ea3n ph\u1ea9m \u0111\u1ea7u ra quan tr\u1ecdng nh\u1ea5t c\u1ee7a m\u1ed9t CA ch\u00ednh l\u00e0 <strong>Digital Certificate<\/strong> (Ch\u1ee9ng th\u01b0 s\u1ed1). \u0110\u00e2y l\u00e0 m\u1ed9t t\u1ec7p d\u1eef li\u1ec7u \u0111i\u1ec7n t\u1eed ch\u1ee9a th\u00f4ng tin x\u00e1c th\u1ef1c c\u1ee7a c\u00e1 nh\u00e2n ho\u1eb7c t\u1ed5 ch\u1ee9c, kh\u00f3a c\u00f4ng khai (Public Key) v\u00e0 ch\u1eef k\u00fd s\u1ed1 c\u1ee7a ch\u00ednh CA \u0111\u00f3 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh h\u1ee3p l\u1ec7.<\/p>\n<p>N\u1ebfu kh\u00f4ng c\u00f3 s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a CA, Internet c\u00f4ng c\u1ed9ng s\u1ebd kh\u00f3 duy tr\u00ec ni\u1ec1m tin &#8211; n\u01a1i b\u1ea5t k\u1ef3 ai c\u0169ng c\u00f3 th\u1ec3 gi\u1ea3 danh l\u00e0 Facebook, Google hay ng\u00e2n h\u00e0ng c\u1ee7a b\u1ea1n \u0111\u1ec3 \u0111\u00e1nh c\u1eafp d\u1eef li\u1ec7u. Do \u0111\u00f3, vi\u1ec7c hi\u1ec3u r\u00f5 kh\u00e1i qu\u00e1t ch\u1ee9ng ch\u1ec9 CA l\u00e0 g\u00ec l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean \u0111\u1ec3 x\u00e2y d\u1ef1ng nh\u1eadn th\u1ee9c \u0111\u00fang \u0111\u1eafn v\u1ec1 an to\u00e0n th\u00f4ng tin.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Vai-tro-va-tam-quan-trong-cua-CA-trong-bao-mat-mang\"><\/span>Vai tr\u00f2 v\u00e0 t\u1ea7m quan tr\u1ecdng c\u1ee7a CA trong b\u1ea3o m\u1eadt m\u1ea1ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Trong h\u1ec7 th\u1ed1ng h\u1ea1 t\u1ea7ng kh\u00f3a c\u00f4ng khai (PKI), CA \u0111\u00f3ng vai tr\u00f2 l\u00e0 &#8220;m\u1ecf neo c\u1ee7a ni\u1ec1m tin&#8221; (Trust Anchor). Vai tr\u00f2 c\u1ee7a h\u1ecd kh\u00f4ng ch\u1ec9 d\u1eebng l\u1ea1i \u1edf vi\u1ec7c c\u1ea5p ph\u00e1t gi\u1ea5y t\u1edd, m\u00e0 c\u00f2n bao g\u1ed3m vi\u1ec7c duy tr\u00ec tr\u1ea1ng th\u00e1i c\u1ee7a c\u00e1c ch\u1ee9ng ch\u1ec9 \u0111\u00f3 trong su\u1ed1t v\u00f2ng \u0111\u1eddi ho\u1ea1t \u0111\u1ed9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Nen-tang-cua-SSLTLS\"><\/span>N\u1ec1n t\u1ea3ng c\u1ee7a SSL\/TLS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Giao th\u1ee9c HTTPS m\u00e0 ch\u00fang ta th\u1ea5y tr\u00ean thanh \u0111\u1ecba ch\u1ec9 tr\u00ecnh duy\u1ec7t kh\u00f4ng th\u1ec3 ho\u1ea1t \u0111\u1ed9ng n\u1ebfu thi\u1ebfu SSL\/TLS Certificate. CA ch\u00ednh l\u00e0 \u0111\u01a1n v\u1ecb duy nh\u1ea5t c\u00f3 th\u1ea9m quy\u1ec1n ban h\u00e0nh c\u00e1c ch\u1ee9ng ch\u1ec9 n\u00e0y. Khi ng\u01b0\u1eddi d\u00f9ng t\u00ecm hi\u1ec3u <strong>Certificate Authority<\/strong>, h\u1ecd th\u01b0\u1eddng nh\u1eadn ra m\u1ed1i quan h\u1ec7 m\u1eadt thi\u1ebft: CA l\u00e0 ng\u01b0\u1eddi c\u1ea5p, SSL l\u00e0 ch\u1ee9ng ch\u1ec9, v\u00e0 HTTPS l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a qu\u00e1 tr\u00ecnh b\u1ea3o m\u1eadt \u0111\u00f3.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Xac-thuc-danh-tinh-Authentication\"><\/span>X\u00e1c th\u1ef1c danh t\u00ednh (Authentication)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>X\u00e1c th\u1ef1c danh t\u00ednh l\u00e0 vai tr\u00f2 quan tr\u1ecdng nh\u1ea5t gi\u00fap ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng l\u1eeba \u0111\u1ea3o (Phishing). Tr\u01b0\u1edbc khi c\u1ea5p ch\u1ee9ng ch\u1ec9, CA ph\u1ea3i th\u1ef1c hi\u1ec7n c\u00e1c b\u01b0\u1edbc x\u00e1c minh danh t\u00ednh c\u1ee7a ng\u01b0\u1eddi y\u00eau c\u1ea7u (qua email, h\u1ed3 s\u01a1 doanh nghi\u1ec7p ho\u1eb7c g\u1ecdi \u0111i\u1ec7n tr\u1ef1c ti\u1ebfp). Nh\u1edd \u0111\u00f3, ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp website c\u00f3 th\u1ec3 tin t\u01b0\u1edfng r\u1eb1ng \u0111\u01a1n v\u1ecb v\u1eadn h\u00e0nh website \u0111\u00fang l\u00e0 \u0111\u01a1n v\u1ecb \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u00ean ch\u1ee9ng ch\u1ec9.<\/p>\n<figure id=\"attachment_37737\" aria-describedby=\"caption-attachment-37737\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37737\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Vai-tro-va-tam-quan-trong-cua-CA.jpg\" alt=\"Vai tr\u00f2 v\u00e0 t\u1ea7m quan tr\u1ecdng c\u1ee7a CA\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Vai-tro-va-tam-quan-trong-cua-CA.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Vai-tro-va-tam-quan-trong-cua-CA-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Vai-tro-va-tam-quan-trong-cua-CA-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-37737\" class=\"wp-caption-text\">Vai tr\u00f2 v\u00e0 t\u1ea7m quan tr\u1ecdng c\u1ee7a CA<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Bao-mat-du-lieu-Encryption\"><\/span>B\u1ea3o m\u1eadt d\u1eef li\u1ec7u (Encryption)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>CA cung c\u1ea5p h\u1ea1 t\u1ea7ng \u0111\u1ec3 k\u00edch ho\u1ea1t kh\u1ea3 n\u0103ng m\u00e3 h\u00f3a. D\u1eef li\u1ec7u truy\u1ec1n t\u1ea3i gi\u1eefa m\u00e1y t\u00ednh ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u00e1y ch\u1ee7 (Server) s\u1ebd \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a b\u1eb1ng c\u00e1c thu\u1eadt to\u00e1n ph\u1ee9c t\u1ea1p. Ngay c\u1ea3 khi hacker ch\u1eb7n \u0111\u01b0\u1ee3c \u0111\u01b0\u1eddng truy\u1ec1n, h\u1ecd c\u0169ng ch\u1ec9 th\u1ea5y m\u1ed9t chu\u1ed7i k\u00fd t\u1ef1 v\u00f4 ngh\u0129a kh\u00f4ng th\u1ec3 gi\u1ea3i m\u00e3.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Toan-ven-du-lieu-Data-Integrity\"><\/span>To\u00e0n v\u1eb9n d\u1eef li\u1ec7u (Data Integrity)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ch\u1ee9ng th\u01b0 s\u1ed1 do CA c\u1ea5p gi\u00fap \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u kh\u00f4ng b\u1ecb thay \u0111\u1ed5i, ch\u1ec9nh s\u1eeda hay ph\u00e1 h\u1ee7y tr\u00ean \u0111\u01b0\u1eddng truy\u1ec1n. N\u1ebfu m\u1ed9t g\u00f3i tin b\u1ecb can thi\u1ec7p, h\u1ec7 th\u1ed1ng s\u1ebd ph\u00e1t hi\u1ec7n ra s\u1ef1 sai l\u1ec7ch ch\u1eef k\u00fd s\u1ed1 v\u00e0 ng\u1eaft k\u1ebft n\u1ed1i ngay l\u1eadp t\u1ee9c \u0111\u1ec3 b\u1ea3o v\u1ec7 ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac-loai-Certificate-Authority-pho-bien-hien-nay\"><\/span>C\u00e1c lo\u1ea1i Certificate Authority ph\u1ed5 bi\u1ebfn hi\u1ec7n nay<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Khi t\u00ecm hi\u1ec3u <strong>Certificate Authority l\u00e0 g\u00ec<\/strong>, nhi\u1ec1u qu\u1ea3n tr\u1ecb vi\u00ean h\u1ec7 th\u1ed1ng th\u01b0\u1eddng b\u1ed1i r\u1ed1i tr\u01b0\u1edbc s\u1ef1 \u0111a d\u1ea1ng c\u1ee7a c\u00e1c lo\u1ea1i h\u00ecnh CA. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ph\u00e2n lo\u1ea1i chi ti\u1ebft:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Public-CA-CA-cong-cong\"><\/span>Public CA (CA c\u00f4ng c\u1ed9ng)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 c\u00e1c t\u1ed5 ch\u1ee9c cung c\u1ea5p d\u1ecbch v\u1ee5 ch\u1ee9ng th\u1ef1c th\u01b0\u01a1ng m\u1ea1i, ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp v\u00e0 \u0111\u01b0\u1ee3c c\u00e1c tr\u00ecnh duy\u1ec7t web l\u1edbn (Chrome, Firefox, Safari, Edge) tin t\u01b0\u1edfng m\u1eb7c \u0111\u1ecbnh.<\/p>\n<ul>\n<li><strong>\u0110\u1eb7c \u0111i\u1ec3m:<\/strong> Ch\u1ee9ng ch\u1ec9 do h\u1ecd c\u1ea5p \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn r\u1ed9ng r\u00e3i tr\u00ean to\u00e0n c\u1ea7u.<\/li>\n<li><strong>\u0110\u1ed1i t\u01b0\u1ee3ng s\u1eed d\u1ee5ng:<\/strong> C\u00e1c website c\u00f4ng c\u1ed9ng, s\u00e0n th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, web doanh nghi\u1ec7p c\u1ea7n ti\u1ebfp c\u1eadn kh\u00e1ch h\u00e0ng \u0111\u1ea1i ch\u00fang. C\u00e1c v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh g\u1ed3m DigiCert, GlobalSign, Sectigo.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Private-CA-CA-noi-bo\"><\/span>Private CA (CA n\u1ed9i b\u1ed9)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 h\u1ec7 th\u1ed1ng CA do ch\u00ednh doanh nghi\u1ec7p t\u1ef1 x\u00e2y d\u1ef1ng \u0111\u1ec3 c\u1ea5p ph\u00e1t ch\u1ee9ng ch\u1ec9 cho c\u00e1c thi\u1ebft b\u1ecb, \u1ee9ng d\u1ee5ng trong m\u1ea1ng n\u1ed9i b\u1ed9 (LAN\/VPN).<\/p>\n<ul>\n<li><strong>\u0110\u1eb7c \u0111i\u1ec3m:<\/strong> Ch\u1ee9ng ch\u1ec9 n\u00e0y kh\u00f4ng \u0111\u01b0\u1ee3c c\u00e1c tr\u00ecnh duy\u1ec7t b\u00ean ngo\u00e0i tin t\u01b0\u1edfng (s\u1ebd b\u00e1o l\u1ed7i \u0111\u1ecf n\u1ebfu truy c\u1eadp t\u1eeb internet c\u00f4ng c\u1ed9ng), nh\u01b0ng ho\u00e0n to\u00e0n h\u1ee3p l\u1ec7 trong m\u1ea1ng n\u1ed9i b\u1ed9.<\/li>\n<li><strong>M\u1ee5c \u0111\u00edch:<\/strong> Ti\u1ebft ki\u1ec7m chi ph\u00ed khi c\u1ea7n c\u1ea5p s\u1ed1 l\u01b0\u1ee3ng l\u1edbn ch\u1ee9ng ch\u1ec9 cho nh\u00e2n vi\u00ean, thi\u1ebft b\u1ecb IoT n\u1ed9i b\u1ed9.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Free-CA-va-Paid-CA-%E2%80%93-nen-chon-loai-nao\"><\/span>Free CA v\u00e0 Paid CA \u2013 n\u00ean ch\u1ecdn lo\u1ea1i n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>S\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a c\u00e1c t\u1ed5 ch\u1ee9c phi l\u1ee3i nhu\u1eadn nh\u01b0 Let&#8217;s Encrypt \u0111\u00e3 thay \u0111\u1ed5i th\u1ecb tr\u01b0\u1eddng.<\/p>\n<ul>\n<li><strong>Free CA (Mi\u1ec5n ph\u00ed):<\/strong> Cung c\u1ea5p ch\u1ee9ng ch\u1ec9 SSL c\u01a1 b\u1ea3n, t\u1ef1 \u0111\u1ed9ng h\u00f3a cao. Tuy nhi\u00ean, ch\u00fang th\u01b0\u1eddng ch\u1ec9 x\u00e1c th\u1ef1c t\u00ean mi\u1ec1n (DV), kh\u00f4ng c\u00f3 b\u1ea3o hi\u1ec3m r\u1ee7i ro v\u00e0 kh\u00f4ng h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt tr\u1ef1c ti\u1ebfp.<\/li>\n<li><strong>Paid CA (Tr\u1ea3 ph\u00ed):<\/strong> Cung c\u1ea5p c\u00e1c m\u1ee9c \u0111\u1ed9 x\u00e1c th\u1ef1c cao h\u01a1n (OV, EV), c\u00f3 ch\u1ebf \u0111\u1ed9 b\u1ea3o h\u00e0nh (Warranty) l\u00ean \u0111\u1ebfn h\u00e0ng tri\u1ec7u USD n\u1ebfu r\u00f2 r\u1ec9 m\u00e3 h\u00f3a, v\u00e0 \u0111\u1ed9i ng\u0169 h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt 24\/7. V\u1edbi c\u00e1c doanh nghi\u1ec7p l\u1edbn, vi\u1ec7c s\u1eed d\u1ee5ng Paid CA l\u00e0 kho\u1ea3n \u0111\u1ea7u t\u01b0 cho uy t\u00edn th\u01b0\u01a1ng hi\u1ec7u.<\/li>\n<\/ul>\n<figure id=\"attachment_37741\" aria-describedby=\"caption-attachment-37741\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37741\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cac-loai-Certificate-Authority-pho-bien-hien-nay.jpg\" alt=\"C\u00e1c lo\u1ea1i Certificate Authority ph\u1ed5 bi\u1ebfn hi\u1ec7n nay\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cac-loai-Certificate-Authority-pho-bien-hien-nay.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cac-loai-Certificate-Authority-pho-bien-hien-nay-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cac-loai-Certificate-Authority-pho-bien-hien-nay-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-37741\" class=\"wp-caption-text\">C\u00e1c lo\u1ea1i Certificate Authority ph\u1ed5 bi\u1ebfn hi\u1ec7n nay<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Cac-thanh-phan-trong-he-thong-Certificate-Authority\"><\/span>C\u00e1c th\u00e0nh ph\u1ea7n trong h\u1ec7 th\u1ed1ng Certificate Authority<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>M\u1ed9t h\u1ec7 th\u1ed1ng CA ho\u00e0n ch\u1ec9nh kh\u00f4ng ch\u1ec9 c\u00f3 m\u1ed9t m\u00e1y ch\u1ee7 \u0111\u01a1n l\u1ebb. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n t\u1ed1i \u0111a, c\u1ea5u tr\u00fac CA \u0111\u01b0\u1ee3c ph\u00e2n t\u1ea7ng ch\u1eb7t ch\u1ebd. Hi\u1ec3u \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac n\u00e0y gi\u00fap b\u1ea1n n\u1eafm r\u00f5 b\u1ea3n ch\u1ea5t k\u1ef9 thu\u1eadt c\u1ee7a <strong>Certificate Authority<\/strong>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Root-CA-CA-goc\"><\/span>Root CA (CA g\u1ed1c)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Root CA l\u00e0 c\u1ea5p cao nh\u1ea5t trong h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p tin c\u1eady. Root Certificate (Ch\u1ee9ng ch\u1ec9 g\u1ed1c) c\u1ee7a c\u00e1c t\u1ed5 ch\u1ee9c n\u00e0y \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t s\u1eb5n m\u1eb7c \u0111\u1ecbnh trong h\u1ec7 \u0111i\u1ec1u h\u00e0nh v\u00e0 tr\u00ecnh duy\u1ec7t web.<\/p>\n<ul>\n<li><strong>\u0110\u1eb7c \u0111i\u1ec3m:<\/strong> Private Key c\u1ee7a Root CA \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 c\u1ef1c k\u1ef3 nghi\u00eam ng\u1eb7t, th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong c\u00e1c thi\u1ebft b\u1ecb ph\u1ea7n c\u1ee9ng chuy\u00ean d\u1ee5ng (HSM) v\u00e0 ng\u1eaft k\u1ebft n\u1ed1i m\u1ea1ng (offline) \u0111\u1ec3 tr\u00e1nh b\u1ecb hack. N\u1ebfu Root CA b\u1ecb l\u1ed9 kh\u00f3a, to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng tin c\u1eady to\u00e0n c\u1ea7u li\u00ean quan \u0111\u1ebfn n\u00f3 s\u1ebd s\u1ee5p \u0111\u1ed5.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Intermediate-CA-CA-trung-gian\"><\/span>Intermediate CA (CA trung gian)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u1ec3 b\u1ea3o v\u1ec7 Root CA, c\u00e1c t\u1ed5 ch\u1ee9c kh\u00f4ng d\u00f9ng Root CA \u0111\u1ec3 c\u1ea5p tr\u1ef1c ti\u1ebfp ch\u1ee9ng ch\u1ec9 cho ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i (End-entity). Thay v\u00e0o \u0111\u00f3, h\u1ecd t\u1ea1o ra c\u00e1c Intermediate CA.<\/p>\n<ul>\n<li>Root CA s\u1ebd k\u00fd x\u00e1c th\u1ef1c cho Intermediate CA.<\/li>\n<li>Intermediate CA s\u1ebd k\u00fd x\u00e1c th\u1ef1c cho ch\u1ee9ng ch\u1ec9 c\u1ee7a website (SSL).<br \/>\nM\u00f4 h\u00ecnh n\u00e0y t\u1ea1o ra m\u1ed9t l\u1edbp \u0111\u1ec7m an to\u00e0n. N\u1ebfu Intermediate CA b\u1ecb t\u1ea5n c\u00f4ng, Root CA v\u1eabn an to\u00e0n v\u00e0 ch\u1ec9 c\u1ea7n thu h\u1ed3i quy\u1ec1n c\u1ee7a nh\u00e1nh trung gian \u0111\u00f3.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Chuoi-tin-cay-Chain-of-Trust\"><\/span>Chu\u1ed7i tin c\u1eady (Chain of Trust)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Khi tr\u00ecnh duy\u1ec7t truy c\u1eadp v\u00e0o m\u1ed9t website, n\u00f3 s\u1ebd ki\u1ec3m tra &#8220;gia ph\u1ea3&#8221; c\u1ee7a ch\u1ee9ng ch\u1ec9 theo quy tr\u00ecnh ng\u01b0\u1ee3c:<\/p>\n<ol>\n<li>Ki\u1ec3m tra SSL c\u1ee7a website -&gt; Th\u1ea5y \u0111\u01b0\u1ee3c c\u1ea5p b\u1edfi Intermediate CA A.<\/li>\n<li>Ki\u1ec3m tra Intermediate CA A -&gt; Th\u1ea5y \u0111\u01b0\u1ee3c c\u1ea5p b\u1edfi Root CA B.<\/li>\n<li>Ki\u1ec3m tra kho l\u01b0u tr\u1eef (Trust Store) tr\u00ean m\u00e1y t\u00ednh -&gt; Th\u1ea5y Root CA B n\u1eb1m trong danh s\u00e1ch tin c\u1eady.<\/li>\n<li>K\u1ebft lu\u1eadn: Website an to\u00e0n. Quy tr\u00ecnh li\u00ean k\u1ebft n\u00e0y g\u1ecdi l\u00e0 Chain of Trust. B\u1ea5t k\u1ef3 m\u1eaft x\u00edch n\u00e0o b\u1ecb \u0111\u1ee9t (v\u00ed d\u1ee5 thi\u1ebfu Intermediate CA), tr\u00ecnh duy\u1ec7t s\u1ebd hi\u1ec7n c\u1ea3nh b\u00e1o b\u1ea3o m\u1eadt.<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"Certificate-Authority-va-SSL-khac-nhau-nhu-the-nao\"><\/span>Certificate Authority v\u00e0 SSL kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>D\u00f9 Certificate Authority v\u00e0 SSL li\u00ean quan m\u1eadt thi\u1ebft, nh\u01b0ng b\u1ea3n ch\u1ea5t c\u1ee7a ch\u00fang ho\u00e0n to\u00e0n kh\u00e1c nhau.<\/p>\n<table style=\"width: 100%; border-collapse: collapse; font-family: Arial, Helvetica, sans-serif; font-size: 15px; line-height: 1.6; box-shadow: 0 4px 12px rgba(0,0,0,0.08); border-radius: 8px; overflow: hidden;\">\n<thead>\n<tr style=\"background: linear-gradient(90deg, #0C40F4, #077FFA, #0497FC); color: #ffffff;\">\n<th style=\"padding: 14px 12px; text-align: left; width: 25%;\">Ti\u00eau ch\u00ed<\/th>\n<th style=\"padding: 14px 12px; text-align: left; width: 37.5%;\">Certificate Authority (CA)<\/th>\n<th style=\"padding: 14px 12px; text-align: left; width: 37.5%;\">SSL (Secure Sockets Layer)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #f8fbff;\">\n<td style=\"padding: 12px; font-weight: 600;\">B\u1ea3n ch\u1ea5t<\/td>\n<td style=\"padding: 12px;\">L\u00e0 m\u1ed9t t\u1ed5 ch\u1ee9c, m\u1ed9t th\u1ef1c th\u1ec3 ph\u00e1p l\u00fd.<\/td>\n<td style=\"padding: 12px;\">L\u00e0 m\u1ed9t giao th\u1ee9c c\u00f4ng ngh\u1ec7 \/ m\u1ed9t t\u1ec7p k\u1ef9 thu\u1eadt s\u1ed1.<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; font-weight: 600;\">Vai tr\u00f2<\/td>\n<td style=\"padding: 12px;\">Ng\u01b0\u1eddi th\u1ea9m \u0111\u1ecbnh v\u00e0 c\u1ea5p ph\u00e1t.<\/td>\n<td style=\"padding: 12px;\">C\u00f4ng c\u1ee5 \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 x\u00e1c th\u1ef1c.<\/td>\n<\/tr>\n<tr style=\"background-color: #f8fbff;\">\n<td style=\"padding: 12px; font-weight: 600;\">V\u00ed d\u1ee5<\/td>\n<td style=\"padding: 12px;\">DigiCert, GlobalSign, VNPT-CA.<\/td>\n<td style=\"padding: 12px;\">Ch\u1ee9ng ch\u1ec9 SSL DV, SSL EV.<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; font-weight: 600;\">V\u00ed d\u1ee5 so s\u00e1nh<\/td>\n<td style=\"padding: 12px;\">Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc (n\u01a1i c\u1ea5p b\u1eb1ng).<\/td>\n<td style=\"padding: 12px;\">T\u1ea5m b\u1eb1ng t\u1ed1t nghi\u1ec7p (gi\u1ea5y ch\u1ee9ng nh\u1eadn).<\/td>\n<\/tr>\n<tr style=\"background-color: #f8fbff;\">\n<td style=\"padding: 12px; font-weight: 600;\">M\u1ed1i quan h\u1ec7<\/td>\n<td style=\"padding: 12px;\">Ph\u00e1t h\u00e0nh ch\u1ee9ng ch\u1ec9 cho SSL\/TLS.<\/td>\n<td style=\"padding: 12px;\">D\u1ef1a v\u00e0o CA \u0111\u1ec3 x\u00e1c th\u1ef1c ch\u1ee9ng ch\u1ec9.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Do \u0111\u00f3, khi \u0111\u1eb7t c\u00e2u h\u1ecfi <strong>Certificate Authority l\u00e0 g\u00ec<\/strong>, b\u1ea1n \u0111ang h\u1ecfi v\u1ec1 \u0111\u01a1n v\u1ecb cung c\u1ea5p. C\u00f2n khi h\u1ecfi v\u1ec1 SSL, b\u1ea1n \u0111ang h\u1ecfi v\u1ec1 s\u1ea3n ph\u1ea9m m\u00e0 \u0111\u01a1n v\u1ecb \u0111\u00f3 cung c\u1ea5p.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Top-cac-to-chuc-SSL-CA-uy-tin-hien-nay\"><\/span>Top c\u00e1c t\u1ed5 ch\u1ee9c\u00a0SSL CA uy t\u00edn hi\u1ec7n nay<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Th\u1ecb tr\u01b0\u1eddng ch\u1ee9ng th\u1ef1c s\u1ed1 \u0111\u01b0\u1ee3c chia th\u00e0nh hai nh\u00f3m ch\u00ednh: C\u00e1c t\u1ed5 ch\u1ee9c qu\u1ed1c t\u1ebf v\u00e0 c\u00e1c \u0111\u01a1n v\u1ecb \u0111\u01b0\u1ee3c c\u1ea5p ph\u00e9p n\u1ed9i \u0111\u1ecba t\u1ea1i Vi\u1ec7t Nam.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tren-the-gioi\"><\/span>Tr\u00ean th\u1ebf gi\u1edbi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>DigiCert:<\/strong> \u0110\u01b0\u1ee3c xem l\u00e0 \u0111\u01a1n v\u1ecb d\u1eabn \u0111\u1ea7u th\u1ecb tr\u01b0\u1eddng v\u1ec1 c\u00e1c gi\u1ea3i ph\u00e1p b\u1ea3o m\u1eadt cao c\u1ea5p (High-assurance). DigiCert th\u01b0\u1eddng \u0111\u01b0\u1ee3c c\u00e1c ng\u00e2n h\u00e0ng, t\u1eadp \u0111o\u00e0n \u0111a qu\u1ed1c gia tin d\u00f9ng v\u00ec quy tr\u00ecnh x\u00e1c minh nghi\u00eam ng\u1eb7t v\u00e0 \u0111\u1ed9 t\u01b0\u01a1ng th\u00edch tuy\u1ec7t \u0111\u1ed1i.<\/li>\n<li><strong>GlobalSign:<\/strong> GlobalSign c\u00f3 th\u1ebf m\u1ea1nh \u0111\u1eb7c bi\u1ec7t trong vi\u1ec7c cung c\u1ea5p ch\u1eef k\u00fd s\u1ed1 cho t\u00e0i li\u1ec7u (PDF Signing) v\u00e0 Code Signing (k\u00fd ph\u1ea7n m\u1ec1m). C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n \u1ee9ng d\u1ee5ng th\u01b0\u1eddng ch\u1ecdn GlobalSign \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ph\u1ea7n m\u1ec1m c\u1ee7a h\u1ecd kh\u00f4ng b\u1ecb Windows b\u00e1o c\u00e1o l\u00e0 virus khi ng\u01b0\u1eddi d\u00f9ng c\u00e0i \u0111\u1eb7t.<\/li>\n<li><strong>Sectigo (tr\u01b0\u1edbc \u0111\u00e2y l\u00e0 Comodo):<\/strong> Sectigo t\u1eadp trung v\u00e0o gi\u1ea3i ph\u00e1p b\u1ea3o m\u1eadt web to\u00e0n di\u1ec7n. Ngo\u00e0i SSL, h\u1ecd cung c\u1ea5p c\u1ea3 c\u00e1c c\u00f4ng c\u1ee5 qu\u00e9t malware, b\u1ea3o m\u1eadt email. \u0110\u00e2y l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1i \u01b0u v\u1ec1 chi ph\u00ed cho c\u00e1c Start-up mu\u1ed1n ti\u1ebft ki\u1ec7m ng\u00e2n s\u00e1ch nh\u01b0ng v\u1eabn c\u1ea7n ch\u1ee9ng ch\u1ec9 th\u01b0\u01a1ng m\u1ea1i.<\/li>\n<li><strong>Let&#8217;s Encrypt:<\/strong> Let&#8217;s Encrypt cung c\u1ea5p SSL mi\u1ec5n ph\u00ed, t\u1ef1 \u0111\u1ed9ng gia h\u1ea1n m\u1ed7i 90 ng\u00e0y. Tuy nhi\u00ean, n\u00f3 kh\u00f4ng h\u1ed7 tr\u1ee3 c\u00e1c m\u1ee9c x\u00e1c th\u1ef1c doanh nghi\u1ec7p (OV\/EV) v\u00e0 kh\u00f4ng c\u00f3 ch\u1ebf \u0111\u1ed9 b\u1ea3o h\u00e0nh t\u00e0i ch\u00ednh, n\u00ean \u00edt \u0111\u01b0\u1ee3c c\u00e1c t\u1ed5 ch\u1ee9c t\u00e0i ch\u00ednh s\u1eed d\u1ee5ng cho h\u1ec7 th\u1ed1ng giao d\u1ecbch ch\u00ednh.<\/li>\n<\/ul>\n<figure id=\"attachment_37738\" aria-describedby=\"caption-attachment-37738\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37738\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Top-cac-to-chuc-SSL-CA-uy-tin-hien-nay.jpg\" alt=\"Top c\u00e1c t\u1ed5 ch\u1ee9c\u00a0SSL CA uy t\u00edn hi\u1ec7n nay\" width=\"800\" height=\"450\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Top-cac-to-chuc-SSL-CA-uy-tin-hien-nay.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Top-cac-to-chuc-SSL-CA-uy-tin-hien-nay-300x169.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Top-cac-to-chuc-SSL-CA-uy-tin-hien-nay-768x432.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-37738\" class=\"wp-caption-text\">Top c\u00e1c t\u1ed5 ch\u1ee9c\u00a0SSL CA uy t\u00edn hi\u1ec7n nay<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Tai-Viet-Nam\"><\/span>T\u1ea1i Vi\u1ec7t Nam<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c d\u1ecbch v\u1ee5 c\u00f4ng, k\u00ea khai thu\u1ebf ho\u1eb7c h\u00f3a \u0111\u01a1n \u0111i\u1ec7n t\u1eed, vi\u1ec7c s\u1eed d\u1ee5ng Ch\u1eef k\u00fd s\u1ed1 c\u00f4ng c\u1ed9ng do c\u00e1c CA Vi\u1ec7t Nam c\u1ea5p l\u00e0 b\u1eaft bu\u1ed9c v\u1ec1 m\u1eb7t ph\u00e1p l\u00fd. C\u00e1c \u0111\u01a1n v\u1ecb n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c B\u1ed9 Th\u00f4ng tin v\u00e0 Truy\u1ec1n th\u00f4ng c\u1ea5p gi\u1ea5y ph\u00e9p ho\u1ea1t \u0111\u1ed9ng.<\/p>\n<ul>\n<li><strong>Viettel-CA:<\/strong> Th\u1ecb ph\u1ea7n l\u1edbn, h\u1ea1 t\u1ea7ng h\u1ed7 tr\u1ee3 r\u1ed9ng kh\u1eafp.<\/li>\n<li><strong>VNPT-CA:<\/strong> \u0110\u01a1n v\u1ecb thu\u1ed9c t\u1eadp \u0111o\u00e0n b\u01b0u ch\u00ednh vi\u1ec5n th\u00f4ng, uy t\u00edn l\u00e2u n\u0103m trong kh\u1ed1i c\u01a1 quan nh\u00e0 n\u01b0\u1edbc.<\/li>\n<li><strong>BKAV-CA, FPT-CA, MISA-CA:<\/strong> C\u00e1c \u0111\u01a1n v\u1ecb c\u00f4ng ngh\u1ec7 t\u01b0 nh\u00e2n cung c\u1ea5p d\u1ecbch v\u1ee5 linh ho\u1ea1t, t\u00edch h\u1ee3p s\u00e2u v\u00e0o c\u00e1c ph\u1ea7n m\u1ec1m k\u1ebf to\u00e1n, qu\u1ea3n tr\u1ecb.<\/li>\n<\/ul>\n<p>L\u01b0u \u00fd r\u1eb1ng, ch\u1ee9ng th\u01b0 s\u1ed1 d\u00f9ng cho Website (SSL) v\u00e0 ch\u1ee9ng th\u01b0 s\u1ed1 d\u00f9ng \u0111\u1ec3 k\u00fd v\u0103n b\u1ea3n (USB Token) l\u00e0 hai \u1ee9ng d\u1ee5ng kh\u00e1c nhau, d\u00f9 c\u00f9ng do m\u1ed9t CA c\u1ea5p ph\u00e1t.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac-loai-chung-chi-so-pho-bien-do-Certificate-Authority-CA-cap\"><\/span>C\u00e1c lo\u1ea1i ch\u1ee9ng ch\u1ec9 s\u1ed1 ph\u1ed5 bi\u1ebfn do Certificate Authority (CA) c\u1ea5p<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Chung-chi-Domain-Validation-DV\"><\/span>Ch\u1ee9ng ch\u1ec9 Domain Validation (DV)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>DV l\u00e0 lo\u1ea1i ch\u1ee9ng ch\u1ec9 c\u00f3 <strong>m\u1ee9c x\u00e1c th\u1ef1c th\u1ea5p nh\u1ea5t<\/strong>, \u0111i k\u00e8m <strong>chi ph\u00ed d\u1ec5 ti\u1ebfp c\u1eadn<\/strong> v\u00e0 <strong>th\u1eddi gian c\u1ea5p ph\u00e1t nhanh<\/strong>. Tr\u1ecdng t\u00e2m c\u1ee7a DV SSL l\u00e0 ki\u1ec3m tra <strong>quy\u1ec1n s\u1edf h\u1eefu t\u00ean mi\u1ec1n<\/strong>, t\u1eeb \u0111\u00f3 thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i m\u00e3 h\u00f3a an to\u00e0n gi\u1eefa tr\u00ecnh duy\u1ec7t v\u00e0 website. Nh\u1edd quy tr\u00ecnh \u0111\u01a1n gi\u1ea3n, ch\u1ee9ng ch\u1ec9 n\u00e0y th\u01b0\u1eddng ph\u00f9 h\u1ee3p v\u1edbi <strong>website c\u00e1 nh\u00e2n, blog ho\u1eb7c trang tin t\u1ee9c quy m\u00f4 nh\u1ecf<\/strong>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chung-chi-Organization-Validation-OV\"><\/span>Ch\u1ee9ng ch\u1ec9 Organization Validation (OV)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>OV SSL \u0111\u01b0\u1ee3c xem l\u00e0 l\u1ef1a ch\u1ecdn c\u00e2n b\u1eb1ng gi\u1eefa DV v\u00e0 EV khi b\u1ed5 sung th\u00eam b\u01b0\u1edbc <strong>x\u00e1c minh th\u00f4ng tin doanh nghi\u1ec7p<\/strong> nh\u01b0 t\u00ean c\u00f4ng ty, \u0111\u1ecba ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng ho\u1eb7c gi\u1ea5y ph\u00e9p \u0111\u0103ng k\u00fd. Nh\u1edd \u0111\u00f3, lo\u1ea1i ch\u1ee9ng ch\u1ec9 n\u00e0y gi\u00fap website <strong>th\u1ec3 hi\u1ec7n danh t\u00ednh r\u00f5 r\u00e0ng h\u01a1n<\/strong>, t\u1ea1o c\u1ea3m gi\u00e1c tin c\u1eady cao h\u01a1n cho ng\u01b0\u1eddi truy c\u1eadp so v\u1edbi DV, \u0111\u1eb7c bi\u1ec7t ph\u00f9 h\u1ee3p v\u1edbi <strong>website doanh nghi\u1ec7p<\/strong>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chung-chi-Extended-Validation-EV\"><\/span>Ch\u1ee9ng ch\u1ec9 Extended Validation (EV)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>EV SSL \u0111\u1ea1i di\u1ec7n cho <strong>c\u1ea5p \u0111\u1ed9 x\u00e1c th\u1ef1c cao nh\u1ea5t<\/strong> trong h\u1ec7 th\u1ed1ng ch\u1ee9ng ch\u1ec9 s\u1ed1, v\u1edbi <strong>quy tr\u00ecnh ki\u1ec3m tra th\u1ee7 c\u00f4ng nghi\u00eam ng\u1eb7t<\/strong> t\u1eeb ph\u00eda Certificate Authority. Lo\u1ea1i ch\u1ee9ng ch\u1ec9 n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c xem nh\u01b0 <strong>ti\u00eau chu\u1ea9n b\u1ea3o m\u1eadt cao<\/strong> d\u00e0nh cho website th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, ng\u00e2n h\u00e0ng ho\u1eb7c t\u1ed5 ch\u1ee9c t\u00e0i ch\u00ednh, nh\u1eb1m <strong>kh\u1eb3ng \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 uy t\u00edn<\/strong> v\u00e0 gi\u1ea3m thi\u1ec3u r\u1ee7i ro l\u1eeba \u0111\u1ea3o cho ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chung-chi-Multi-domain-SANUCC\"><\/span>Ch\u1ee9ng ch\u1ec9 Multi-domain (SAN\/UCC)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Multi-domain, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ch\u1ee9ng ch\u1ec9 <strong>SAN\/UCC<\/strong>, l\u00e0 gi\u1ea3i ph\u00e1p ph\u00f9 h\u1ee3p khi c\u1ea7n <strong>b\u1ea3o v\u1ec7 nhi\u1ec1u t\u00ean mi\u1ec1n v\u00e0 t\u00ean mi\u1ec1n con c\u00f9ng l\u00fac<\/strong>. Ch\u1ec9 v\u1edbi m\u1ed9t ch\u1ee9ng ch\u1ec9 duy nh\u1ea5t, b\u1ea1n c\u00f3 th\u1ec3 qu\u1ea3n l\u00fd b\u1ea3o m\u1eadt cho <strong>h\u00e0ng tr\u0103m domain kh\u00e1c nhau<\/strong>, t\u1eeb \u0111\u00f3 <strong>\u0111\u01a1n gi\u1ea3n h\u00f3a vi\u1ec7c v\u1eadn h\u00e0nh v\u00e0 qu\u1ea3n tr\u1ecb h\u1ec7 th\u1ed1ng<\/strong>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chung-chi-Wildcard-SSL\"><\/span>Ch\u1ee9ng ch\u1ec9 Wildcard SSL<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Wildcard SSL cho ph\u00e9p m\u00e3 h\u00f3a <strong>t\u00ean mi\u1ec1n ch\u00ednh v\u00e0 to\u00e0n b\u1ed9 c\u00e1c t\u00ean mi\u1ec1n con tr\u1ef1c thu\u1ed9c<\/strong>, kh\u00f4ng gi\u1edbi h\u1ea1n s\u1ed1 l\u01b0\u1ee3ng. Lo\u1ea1i ch\u1ee9ng ch\u1ec9 n\u00e0y th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n \u1edf c\u00e1c m\u1ee9c x\u00e1c th\u1ef1c <strong>DV ho\u1eb7c OV<\/strong>, gi\u00fap doanh nghi\u1ec7p <strong>ti\u1ebft ki\u1ec7m chi ph\u00ed v\u00e0 th\u1eddi gian<\/strong> khi m\u1edf r\u1ed9ng th\u00eam c\u00e1c ph\u00e2n h\u1ec7 ho\u1eb7c website con trong t\u01b0\u01a1ng lai.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chung-chi-Code-Signing\"><\/span>Ch\u1ee9ng ch\u1ec9 Code Signing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Code Signing l\u00e0 ch\u1ee9ng ch\u1ec9 chuy\u00ean bi\u1ec7t d\u00e0nh cho <strong>nh\u00e0 ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m<\/strong>, d\u00f9ng \u0111\u1ec3 <strong>x\u00e1c minh ngu\u1ed3n g\u1ed1c t\u00e1c gi\u1ea3<\/strong> v\u00e0 \u0111\u1ea3m b\u1ea3o <strong>t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a m\u00e3 ngu\u1ed3n<\/strong>. Th\u00f4ng qua c\u1eb7p kh\u00f3a m\u1eadt m\u00e3, ch\u1ee9ng ch\u1ec9 n\u00e0y gi\u00fap ch\u1ee9ng minh r\u1eb1ng <strong>\u1ee9ng d\u1ee5ng ho\u1eb7c t\u1ec7p tin ch\u01b0a b\u1ecb ch\u1ec9nh s\u1eeda hay ch\u00e8n m\u00e3 \u0111\u1ed9c<\/strong> tr\u01b0\u1edbc khi \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i \u0111\u1ebfn ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chung-chi-SMIME\"><\/span>Ch\u1ee9ng ch\u1ec9 S\/MIME<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>S\/MIME (Secure\/Multipurpose Internet Mail Extensions) \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ri\u00eang cho <strong>h\u1ec7 th\u1ed1ng email doanh nghi\u1ec7p<\/strong>. Ch\u1ee9ng ch\u1ec9 n\u00e0y ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch <strong>m\u00e3 h\u00f3a n\u1ed9i dung email b\u1eb1ng kh\u00f3a c\u00f4ng khai c\u1ee7a ng\u01b0\u1eddi nh\u1eadn<\/strong>, \u0111\u1ea3m b\u1ea3o ch\u1ec9 ng\u01b0\u1eddi s\u1edf h\u1eefu kh\u00f3a ri\u00eang t\u01b0 t\u01b0\u01a1ng \u1ee9ng m\u1edbi c\u00f3 th\u1ec3 gi\u1ea3i m\u00e3 v\u00e0 \u0111\u1ecdc n\u1ed9i dung, t\u1eeb \u0111\u00f3 <strong>ng\u0103n ch\u1eb7n hi\u1ec7u qu\u1ea3 nguy c\u01a1 nghe l\u00e9n email<\/strong>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Tieu-chi-lua-chon-nha-cung-cap-CA-uy-tin\"><\/span>Ti\u00eau ch\u00ed l\u1ef1a ch\u1ecdn nh\u00e0 cung c\u1ea5p CA uy t\u00edn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vi\u1ec7c hi\u1ec3u <strong>Certificate Authority l\u00e0 g\u00ec<\/strong> ch\u1ec9 l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u. Ch\u1ecdn \u0111\u00fang CA s\u1ebd gi\u00fap doanh nghi\u1ec7p tr\u00e1nh \u0111\u01b0\u1ee3c c\u00e1c r\u1ee7i ro gi\u00e1n \u0111o\u1ea1n d\u1ecbch v\u1ee5 v\u00e0 t\u1ed1i \u01b0u chi ph\u00ed. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c ti\u00eau ch\u00ed quan tr\u1ecdng c\u1ea7n c\u00e2n nh\u1eafc:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chinh-sach-bao-mat-ho-tro-ky-thuat\"><\/span>Ch\u00ednh s\u00e1ch b\u1ea3o m\u1eadt &amp; h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>M\u1ed9t CA uy t\u00edn ph\u1ea3i c\u00f3 quy tr\u00ecnh x\u00e1c minh minh b\u1ea1ch (theo chu\u1ea9n WebTrust). Ngo\u00e0i ra, kh\u1ea3 n\u0103ng h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t. Khi website c\u1ee7a b\u1ea1n b\u1ecb l\u1ed7i SSL v\u00e0o l\u00fac n\u1eeda \u0111\u00eam, b\u1ea1n c\u1ea7n m\u1ed9t \u0111\u01a1n v\u1ecb c\u00f3 \u0111\u1ed9i ng\u0169 support ph\u1ea3n h\u1ed3i ngay l\u1eadp t\u1ee9c ch\u1ee9 kh\u00f4ng ph\u1ea3i h\u1ec7 th\u1ed1ng tr\u1ea3 l\u1eddi t\u1ef1 \u0111\u1ed9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tuong-thich-voi-CAA-Record-he-thong-DNS\"><\/span>T\u01b0\u01a1ng th\u00edch v\u1edbi CAA Record &amp; h\u1ec7 th\u1ed1ng DNS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>CAA (Certificate Authority Authorization) l\u00e0 m\u1ed9t b\u1ea3n ghi trong DNS cho ph\u00e9p ch\u1ee7 t\u00ean mi\u1ec1n quy \u0111\u1ecbnh CA n\u00e0o \u0111\u01b0\u1ee3c ph\u00e9p c\u1ea5p ch\u1ee9ng ch\u1ec9 cho t\u00ean mi\u1ec1n c\u1ee7a h\u1ecd. M\u1ed9t CA chuy\u00ean nghi\u1ec7p ph\u1ea3i tu\u00e2n th\u1ee7 nghi\u00eam ng\u1eb7t b\u1ea3n ghi CAA n\u00e0y \u0111\u1ec3 ng\u0103n ch\u1eb7n vi\u1ec7c c\u1ea5p ph\u00e1t sai tr\u00e1i.<\/p>\n<figure id=\"attachment_37739\" aria-describedby=\"caption-attachment-37739\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37739\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tieu-chi-lua-chon-nha-cung-cap-CA-uy-tin.jpg\" alt=\"Ti\u00eau ch\u00ed l\u1ef1a ch\u1ecdn nh\u00e0 cung c\u1ea5p CA uy t\u00edn\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tieu-chi-lua-chon-nha-cung-cap-CA-uy-tin.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tieu-chi-lua-chon-nha-cung-cap-CA-uy-tin-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tieu-chi-lua-chon-nha-cung-cap-CA-uy-tin-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-37739\" class=\"wp-caption-text\">Ti\u00eau ch\u00ed l\u1ef1a ch\u1ecdn nh\u00e0 cung c\u1ea5p CA uy t\u00edn<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Muc-do-pho-bien-cua-Certificate-Authority\"><\/span>M\u1ee9c \u0111\u1ed9 ph\u1ed5 bi\u1ebfn c\u1ee7a Certificate Authority<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>B\u00ean c\u1ea1nh l\u1ecbch s\u1eed ph\u00e1t tri\u1ec3n, <strong>\u0111\u1ed9 ph\u1ed5 bi\u1ebfn<\/strong> c\u0169ng l\u00e0 y\u1ebfu t\u1ed1 \u0111\u00e1ng quan t\u00e2m. B\u1ea1n c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u th\u00f4ng tin qua Internet ho\u1eb7c c\u00e1c c\u1ed9ng \u0111\u1ed3ng, di\u1ec5n \u0111\u00e0n \u0111\u1ec3 <strong>tham kh\u1ea3o \u0111\u00e1nh gi\u00e1 t\u1eeb ng\u01b0\u1eddi \u0111\u00e3 t\u1eebng s\u1eed d\u1ee5ng<\/strong>, t\u1eeb \u0111\u00f3 c\u00f3 c\u00e1i nh\u00ecn kh\u00e1ch quan h\u01a1n v\u1ec1 ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9 ph\u1ee7 c\u1ee7a Certificate Authority.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cac-bien-phap-bao-mat-do-Certificate-Authority-cung-cap\"><\/span>C\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt do Certificate Authority cung c\u1ea5p<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ngo\u00e0i nh\u1eefng y\u1ebfu t\u1ed1 nh\u01b0 <strong>\u0111\u1ed9 ph\u1ed5 bi\u1ebfn, l\u1ecbch s\u1eed ph\u00e1t tri\u1ec3n hay d\u1ecbch v\u1ee5 \u0111i k\u00e8m<\/strong>, <strong>t\u00ednh n\u0103ng b\u1ea3o m\u1eadt<\/strong> c\u0169ng l\u00e0 ti\u00eau ch\u00ed kh\u00f4ng th\u1ec3 b\u1ecf qua. Tr\u01b0\u1edbc khi l\u1ef1a ch\u1ecdn Certificate Authority cho website, b\u1ea1n n\u00ean <strong>t\u00ecm hi\u1ec3u k\u1ef9 c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u ch\u1ee9ng ch\u1ec9<\/strong> m\u00e0 CA cung c\u1ea5p \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o m\u1ee9c \u0111\u1ed9 an to\u00e0n ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u s\u1eed d\u1ee5ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do-tin-cay-cua-trinh-duyet\"><\/span>\u0110\u1ed9 tin c\u1eady c\u1ee7a tr\u00ecnh duy\u1ec7t<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 ti\u00eau ch\u00ed s\u1ed1ng c\u00f2n. Ch\u1ee9ng th\u01b0 s\u1ed1 c\u1ea5p ra ph\u1ea3i \u0111\u01b0\u1ee3c 99.9% c\u00e1c tr\u00ecnh duy\u1ec7t (Chrome, Safari, Firefox, Edge) tr\u00ean c\u1ea3 m\u00e1y t\u00ednh v\u00e0 thi\u1ebft b\u1ecb di \u0111\u1ed9ng ch\u1ea5p nh\u1eadn. N\u1ebfu b\u1ea1n mua SSL t\u1eeb m\u1ed9t CA l\u1ea1 l\u1eabm, kh\u00e1ch h\u00e0ng truy c\u1eadp web c\u00f3 th\u1ec3 g\u1eb7p c\u1ea3nh b\u00e1o &#8220;K\u1ebft n\u1ed1i kh\u00f4ng ri\u00eang t\u01b0&#8221;, l\u00e0m gi\u1ea3m uy t\u00edn th\u01b0\u01a1ng hi\u1ec7u nghi\u00eam tr\u1ecdng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Muc-do-xac-thuc\"><\/span>M\u1ee9c \u0111\u1ed9 x\u00e1c th\u1ef1c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>T\u00f9y v\u00e0o quy m\u00f4 website m\u00e0 b\u1ea1n ch\u1ecdn lo\u1ea1i x\u00e1c th\u1ef1c ph\u00f9 h\u1ee3p:<\/p>\n<ul>\n<li><strong>DV (Domain Validation):<\/strong> Ch\u1ec9 x\u00e1c minh quy\u1ec1n s\u1edf h\u1eefu t\u00ean mi\u1ec1n. Ph\u00f9 h\u1ee3p cho blog c\u00e1 nh\u00e2n, web tin t\u1ee9c. C\u1ea5p ph\u00e1t nhanh trong v\u00e0i ph\u00fat.<\/li>\n<li><strong>OV (Organization Validation):<\/strong> X\u00e1c minh th\u00eam th\u00f4ng tin doanh nghi\u1ec7p. Ph\u00f9 h\u1ee3p cho web c\u00f4ng ty, t\u1ed5 ch\u1ee9c phi ch\u00ednh ph\u1ee7.<\/li>\n<li><strong>EV (Extended Validation):<\/strong> M\u1ee9c x\u00e1c minh cao nh\u1ea5t, hi\u1ec3n th\u1ecb t\u00ean doanh nghi\u1ec7p r\u00f5 r\u00e0ng tr\u00ean chi ti\u1ebft ch\u1ee9ng ch\u1ec9. B\u1eaft bu\u1ed9c \u0111\u1ed1i v\u1edbi Ng\u00e2n h\u00e0ng, Fintech, s\u00e0n TM\u0110T l\u1edbn.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Dich-vu-ho-tro-va-Chi-phi\"><\/span>D\u1ecbch v\u1ee5 h\u1ed7 tr\u1ee3 v\u00e0 Chi ph\u00ed<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>T\u1ea1i Vi\u1ec7t Nam, nhi\u1ec1u doanh nghi\u1ec7p \u01b0u ti\u00ean ch\u1ecdn mua SSL c\u1ee7a c\u00e1c CA qu\u1ed1c t\u1ebf th\u00f4ng qua \u0111\u1ea1i l\u00fd trong n\u01b0\u1edbc \u0111\u1ec3 v\u1eeba c\u00f3 ch\u1ee9ng ch\u1ec9 uy t\u00edn to\u00e0n c\u1ea7u, v\u1eeba \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt b\u1eb1ng ti\u1ebfng Vi\u1ec7t v\u00e0 xu\u1ea5t h\u00f3a \u0111\u01a1n t\u00e0i ch\u00ednh h\u1ee3p l\u1ec7.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Huong-dan-dang-ky-chung-chi-SSL-thong-qua-Certificate-Authority\"><\/span>H\u01b0\u1edbng d\u1eabn \u0111\u0103ng k\u00fd ch\u1ee9ng ch\u1ec9 SSL th\u00f4ng qua Certificate Authority<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vi\u1ec7c \u0111\u0103ng k\u00fd ch\u1ee9ng ch\u1ec9 SSL cho website hi\u1ec7n nay kh\u00f4ng qu\u00e1 ph\u1ee9c t\u1ea1p. Nhi\u1ec1u nh\u00e0 cung c\u1ea5p t\u00ean mi\u1ec1n ho\u1eb7c hosting \u0111\u00e3 t\u00edch h\u1ee3p s\u1eb5n d\u1ecbch v\u1ee5 SSL trong c\u00e1c g\u00f3i s\u1ea3n ph\u1ea9m khi b\u1ea1n mua domain ho\u1eb7c hosting. Trong tr\u01b0\u1eddng h\u1ee3p b\u1ea1n mu\u1ed1n s\u1eed d\u1ee5ng SSL t\u1eeb m\u1ed9t Certificate Authority kh\u00e1c, c\u00f3 th\u1ec3 tham kh\u1ea3o quy tr\u00ecnh \u0111\u0103ng k\u00fd ti\u00eau chu\u1ea9n d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1<\/strong>:Tr\u01b0\u1edbc ti\u00ean, b\u1ea1n c\u1ea7n <strong>t\u1ea1o CSR<\/strong> tr\u00ean m\u00e1y ch\u1ee7 (server) ho\u1eb7c th\u00f4ng qua <strong>Control Panel c\u1ee7a hosting<\/strong>, g\u1eafn v\u1edbi t\u00ean mi\u1ec1n d\u1ef1 \u0111\u1ecbnh \u0111\u0103ng k\u00fd ch\u1ee9ng ch\u1ec9 SSL.<\/li>\n<li><strong>B\u01b0\u1edbc 2<\/strong>: Sau khi t\u1ea1o CSR, b\u1ea1n ti\u1ebfn h\u00e0nh <strong>nh\u1eadp v\u00e0 g\u1eedi CSR<\/strong> theo h\u01b0\u1edbng d\u1eabn chi ti\u1ebft \u0111\u01b0\u1ee3c <strong>Certificate Authority cung c\u1ea5p qua email<\/strong>.<\/li>\n<li><strong>B\u01b0\u1edbc 3<\/strong>: T\u00f9y theo lo\u1ea1i ch\u1ee9ng ch\u1ec9 SSL \u0111\u0103ng k\u00fd, <strong>Certificate Authority s\u1ebd g\u1eedi email x\u00e1c nh\u1eadn<\/strong> \u0111\u1ebfn email ch\u1ee7 s\u1edf h\u1eefu t\u00ean mi\u1ec1n ho\u1eb7c email g\u1eafn v\u1edbi t\u00ean mi\u1ec1n \u0111\u1ec3 ti\u1ebfn h\u00e0nh b\u01b0\u1edbc x\u00e1c th\u1ef1c.<\/li>\n<li><strong>B\u01b0\u1edbc 4<\/strong>: Khi qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c t\u00ean mi\u1ec1n ho\u00e0n t\u1ea5t, b\u1ea1n ch\u1ec9 c\u1ea7n ki\u1ec3m tra h\u1ed9p th\u01b0 email \u0111\u1ec3 nh\u1eadn \u0111\u1ea7y \u0111\u1ee7 th\u00f4ng tin ch\u1ee9ng ch\u1ec9 SSL do Certificate Authority c\u1ea5p.<\/li>\n<li><strong>B\u01b0\u1edbc 5<\/strong>: Cu\u1ed1i c\u00f9ng, b\u1ea1n c\u00f3 th\u1ec3 <strong>truy c\u1eadp t\u00ean mi\u1ec1n tr\u00ean tr\u00ecnh duy\u1ec7t<\/strong> \u0111\u1ec3 ki\u1ec3m tra ch\u1ee9ng ch\u1ec9. N\u1ebfu c\u1ea5u h\u00ecnh th\u00e0nh c\u00f4ng, website s\u1ebd hi\u1ec3n th\u1ecb \u0111\u1ecba ch\u1ec9 d\u1ea1ng <code>https:\/\/yourdomain.com<\/code> k\u00e8m theo <strong>bi\u1ec3u t\u01b0\u1ee3ng \u1ed5 kh\u00f3a<\/strong> ph\u00eda tr\u01b0\u1edbc thanh URL.<\/li>\n<\/ul>\n<figure id=\"attachment_37740\" aria-describedby=\"caption-attachment-37740\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37740\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cach-dang-ky-chung-chi-SSL-CA.jpg\" alt=\"C\u00e1ch \u0111\u0103ng k\u00fd ch\u1ee9ng ch\u1ec9 SSL CA\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cach-dang-ky-chung-chi-SSL-CA.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cach-dang-ky-chung-chi-SSL-CA-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cach-dang-ky-chung-chi-SSL-CA-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-37740\" class=\"wp-caption-text\">C\u00e1ch \u0111\u0103ng k\u00fd ch\u1ee9ng ch\u1ec9 SSL CA<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Cau-hoi-thuong-gap-ve-Certificate-Authority-FAQ\"><\/span>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 Certificate Authority (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Trong qu\u00e1 tr\u00ecnh h\u1ed7 tr\u1ee3 kh\u00e1ch h\u00e0ng, <strong>InterData<\/strong> th\u01b0\u1eddng xuy\u00ean nh\u1eadn \u0111\u01b0\u1ee3c nh\u1eefng th\u1eafc m\u1eafc xoay quanh ch\u1ee7 \u0111\u1ec1 <strong>Certificate Authority<\/strong>. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 gi\u1ea3i \u0111\u00e1p cho nh\u1eefng c\u00e2u h\u1ecfi ph\u1ed5 bi\u1ebfn nh\u1ea5t:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Certificate-Authority-co-bat-buoc-khong\"><\/span>Certificate Authority c\u00f3 b\u1eaft bu\u1ed9c kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>V\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt, b\u1ea1n c\u00f3 th\u1ec3 t\u1ef1 t\u1ea1o CA (Self-signed CA) v\u00e0 t\u1ef1 c\u1ea5p ch\u1ee9ng ch\u1ec9 cho m\u00ecnh. Tuy nhi\u00ean, ch\u1ee9ng ch\u1ec9 n\u00e0y s\u1ebd kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ea5t k\u1ef3 tr\u00ecnh duy\u1ec7t n\u00e0o tin t\u01b0\u1edfng. \u0110\u1ec3 website ho\u1ea1t \u0111\u1ed9ng c\u00f4ng khai v\u00e0 kh\u00f4ng b\u1ecb c\u1ea3nh b\u00e1o b\u1ea3o m\u1eadt, vi\u1ec7c s\u1eed d\u1ee5ng CA \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn l\u00e0 <strong>b\u1eaft bu\u1ed9c<\/strong>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Website-khong-co-CA-thi-dieu-gi-xay-ra\"><\/span>Website kh\u00f4ng c\u00f3 CA th\u00ec \u0111i\u1ec1u g\u00ec x\u1ea3y ra?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>N\u1ebfu website kh\u00f4ng c\u00e0i \u0111\u1eb7t ch\u1ee9ng th\u01b0 s\u1ed1 t\u1eeb CA:<\/p>\n<ol>\n<li>Tr\u00ecnh duy\u1ec7t s\u1ebd \u0111\u00e1nh d\u1ea5u &#8220;Not Secure&#8221; (Kh\u00f4ng b\u1ea3o m\u1eadt) tr\u00ean thanh \u0111\u1ecba ch\u1ec9.<\/li>\n<li>D\u1eef li\u1ec7u kh\u00e1ch h\u00e0ng (m\u1eadt kh\u1ea9u, th\u1ebb t\u00edn d\u1ee5ng) truy\u1ec1n \u0111i \u1edf d\u1ea1ng v\u0103n b\u1ea3n thu\u1ea7n (plain text), d\u1ec5 b\u1ecb hacker \u0111\u00e1nh c\u1eafp.<\/li>\n<li>Th\u1ee9 h\u1ea1ng SEO tr\u00ean Google s\u1ebd b\u1ecb gi\u1ea3m v\u00ec Google \u01b0u ti\u00ean c\u00e1c trang c\u00f3 HTTPS.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Co-the-tu-tao-CA-khong\"><\/span>C\u00f3 th\u1ec3 t\u1ef1 t\u1ea1o CA kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C\u00f3, b\u1ea1n ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 t\u1ef1 d\u1ef1ng m\u1ed9t Private CA b\u1eb1ng c\u00e1c c\u00f4ng c\u1ee5 nh\u01b0 OpenSSL ho\u1eb7c Microsoft Active Directory Certificate Services. Gi\u1ea3i ph\u00e1p n\u00e0y th\u01b0\u1eddng d\u00f9ng cho m\u00f4i tr\u01b0\u1eddng n\u1ed9i b\u1ed9 doanh nghi\u1ec7p (Intranet), n\u01a1i b\u1ea1n c\u00f3 th\u1ec3 ch\u1ee7 \u0111\u1ed9ng c\u00e0i \u0111\u1eb7t Root Certificate c\u1ee7a m\u00ecnh v\u00e0o m\u00e1y t\u00ednh nh\u00e2n vi\u00ean.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Phan-ket-luan\"><\/span>Ph\u1ea7n k\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Qua b\u00e0i vi\u1ebft n\u00e0y, hy v\u1ecdng b\u1ea1n \u0111\u00e3 c\u00f3 c\u00e1i nh\u00ecn to\u00e0n di\u1ec7n v\u1ec1 <strong>Certificate Authority l\u00e0 g\u00ec<\/strong> c\u0169ng nh\u01b0 t\u1ea7m quan tr\u1ecdng kh\u00f4ng th\u1ec3 thay th\u1ebf c\u1ee7a c\u00e1c t\u1ed5 ch\u1ee9c n\u00e0y trong k\u1ef7 nguy\u00ean s\u1ed1. CA kh\u00f4ng ch\u1ec9 l\u00e0 \u0111\u01a1n v\u1ecb c\u1ea5p ph\u00e1t m\u1ed9t t\u1ec7p tin k\u1ef9 thu\u1eadt s\u1ed1, m\u00e0 h\u1ecd ch\u00ednh l\u00e0 ng\u01b0\u1eddi b\u1ea3o v\u1ec7 ni\u1ec1m tin gi\u1eefa doanh nghi\u1ec7p v\u00e0 kh\u00e1ch h\u00e0ng tr\u00ean m\u00f4i tr\u01b0\u1eddng internet \u0111\u1ea7y r\u1ee7i ro.<\/p>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn m\u1ed9t CA uy t\u00edn, ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u v\u00e0 ng\u00e2n s\u00e1ch l\u00e0 b\u01b0\u1edbc \u0111i chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ec3 b\u1ea3o v\u1ec7 th\u01b0\u01a1ng hi\u1ec7u. N\u1ebfu b\u1ea1n v\u1eabn c\u00f2n b\u0103n kho\u0103n trong vi\u1ec7c l\u1ef1a ch\u1ecdn lo\u1ea1i ch\u1ee9ng th\u01b0 s\u1ed1 n\u00e0o ho\u1eb7c c\u1ea7n h\u1ed7 tr\u1ee3 \u0111\u0103ng k\u00fd SSL, \u0111\u1eebng ng\u1ea7n ng\u1ea1i tham kh\u1ea3o c\u00e1c gi\u1ea3i ph\u00e1p l\u01b0u tr\u1eef b\u1ea3o m\u1eadt cao t\u1ea1i <strong>InterData<\/strong> ho\u1eb7c \u0111\u1ec3 l\u1ea1i b\u00ecnh lu\u1eadn b\u00ean d\u01b0\u1edbi \u0111\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1ed9i ng\u0169 chuy\u00ean gia c\u1ee7a ch\u00fang t\u00f4i t\u01b0 v\u1ea5n chi ti\u1ebft.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Khi truy c\u1eadp m\u1ed9t website c\u00f3 bi\u1ec3u t\u01b0\u1ee3ng \u1ed5 kh\u00f3a v\u00e0 giao th\u1ee9c HTTPS, b\u1ea1n \u0111ang s\u1eed d\u1ee5ng m\u1ed9t k\u1ebft n\u1ed1i \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c v\u00e0 b\u1ea3o m\u1eadt. \u0110\u1ee9ng sau c\u01a1 ch\u1ebf n\u00e0y l\u00e0 Certificate Authority (CA) \u2013 t\u1ed5 ch\u1ee9c ch\u1ecbu tr\u00e1ch nhi\u1ec7m x\u00e1c minh danh t\u00ednh v\u00e0 ph\u00e1t h\u00e0nh ch\u1ee9ng ch\u1ec9 s\u1ed1 cho website.<\/p>\n","protected":false},"author":11,"featured_media":37742,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83],"tags":[],"class_list":["post-37734","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bao-mat-an-ninh-mang"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/37734","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=37734"}],"version-history":[{"count":2,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/37734\/revisions"}],"predecessor-version":[{"id":37743,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/37734\/revisions\/37743"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/37742"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=37734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=37734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=37734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}