{"id":12379446,"date":"2026-03-20T11:52:35","date_gmt":"2026-03-20T03:52:35","guid":{"rendered":"https:\/\/www.likacloud.com\/knowledge\/%e5%85%a8%e9%9d%a2%e8%a7%a3%e6%9e%90ssl%e8%af%81%e4%b9%a6%ef%bc%9a%e4%bb%8e%e5%8e%9f%e7%90%86%e5%88%b0%e9%83%a8%e7%bd%b2%ef%bc%8c%e4%bf%9d%e9%9a%9c%e7%bd%91%e7%ab%99%e5%ae%89%e5%85%a8%e4%b8%8e\/"},"modified":"2026-03-20T12:05:25","modified_gmt":"2026-03-20T04:05:25","slug":"ssl-certificate-guide-principle-deployment-security-trust","status":"publish","type":"knowledge_post","link":"https:\/\/www.likacloud.com\/vi\/knowledge\/ssl-certificate\/ssl-certificate-guide-principle-deployment-security-trust\/","title":{"rendered":"Ph\u00e2n t\u00edch to\u00e0n di\u1ec7n v\u1ec1 ch\u1ee9ng ch\u1ec9 SSL: T\u1eeb nguy\u00ean l\u00fd \u0111\u1ebfn qu\u00e1 tr\u00ecnh tri\u1ec3n khai, nh\u1eb1m b\u1ea3o v\u1ec7 an ninh v\u00e0 uy t\u00edn cho trang web"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Trong m\u00f4i tr\u01b0\u1eddng internet ng\u00e0y nay, b\u1ea3o m\u1eadt d\u1eef li\u1ec7u v\u00e0 quy\u1ec1n ri\u00eang t\u01b0 c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u00e3 tr\u1edf th\u00e0nh nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u1ef1c k\u1ef3 quan tr\u1ecdng. Khi ng\u01b0\u1eddi d\u00f9ng nh\u00ecn th\u1ea5y bi\u1ec3u t\u01b0\u1ee3ng kh\u00f3a nh\u1ecf \u1edf thanh \u0111\u1ecba ch\u1ec9 tr\u00ecnh duy\u1ec7t, \u0111i\u1ec1u \u0111\u00f3 th\u01b0\u1eddng c\u00f3 ngh\u0129a l\u00e0 h\u1ecd \u0111ang truy c\u1eadp v\u00e0o m\u1ed9t trang web an to\u00e0n. \u0110\u1eb1ng sau bi\u1ec3u t\u01b0\u1ee3ng kh\u00f3a n\u00e0y ch\u00ednh l\u00e0 giao th\u1ee9c SSL\/TLS v\u00e0 c\u00f4ng c\u1ee5 ch\u00ednh \u0111\u1ec3 tri\u1ec3n khai n\u00f3 \u2013 ch\u1ee9ng ch\u1ec9 SSL. Ch\u1ee9ng ch\u1ec9 SSL kh\u00f4ng ch\u1ec9 gi\u00fap m\u00e3 h\u00f3a d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n t\u1ea3i, ng\u0103n ch\u1eb7n vi\u1ec7c th\u00f4ng tin nh\u1ea1y c\u1ea3m b\u1ecb \u0111\u00e1nh c\u1eafp ho\u1eb7c s\u1eeda \u0111\u1ed5i, m\u00e0 c\u00f2n l\u00e0 b\u1eb1ng ch\u1ee9ng x\u00e1c th\u1ef1c danh t\u00ednh c\u1ee7a trang web, l\u00e0 n\u1ec1n t\u1ea3ng c\u01a1 b\u1ea3n \u0111\u1ec3 x\u00e2y d\u1ef1ng l\u00f2ng tin c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. D\u00f9 l\u00e0 giao d\u1ecbch th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, \u0111\u0103ng nh\u1eadp ng\u01b0\u1eddi d\u00f9ng hay vi\u1ec7c g\u1eedi th\u00f4ng tin, ch\u1ee9ng ch\u1ec9 SSL \u0111\u1ec1u \u0111\u00f3ng vai tr\u00f2 nh\u01b0 \u201cl\u1edbp ph\u00f2ng th\u1ee7 \u0111\u1ea7u ti\u00ean\u201d trong b\u1ea3o m\u1eadt m\u1ea1ng v\u00e0 l\u00e0 ti\u00eau chu\u1ea9n kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ed1i v\u1edbi c\u00e1c trang web hi\u1ec7n \u0111\u1ea1i.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nguy\u00ean l\u00fd c\u1ed1t l\u00f5i c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL d\u1ef1a tr\u00ean c\u00e1c c\u00f4ng ngh\u1ec7 m\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng v\u00e0 ch\u1eef k\u00fd s\u1ed1, t\u1ea1o n\u00ean m\u1ed9t chu\u1ed7i tin c\u1eady an to\u00e0n ho\u00e0n ch\u1ec9nh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">S\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa m\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng v\u00e0 m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Giao th\u1ee9c SSL\/TLS k\u1ebft h\u1ee3p nh\u1eefng \u01b0u \u0111i\u1ec3m c\u1ee7a c\u1ea3 m\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng v\u00e0 m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng. Trong giai \u0111o\u1ea1n thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i (handshake), kh\u00e1ch h\u00e0ng v\u00e0 m\u00e1y ch\u1ee7 s\u1eed d\u1ee5ng m\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng (th\u01b0\u1eddng d\u1ef1a tr\u00ean c\u00e1c thu\u1eadt to\u00e1n RSA ho\u1eb7c ECC) \u0111\u1ec3 trao \u0111\u1ed5i m\u1ed9t \u201ckh\u00f3a phi\u00ean\u201d m\u1ed9t c\u00e1ch an to\u00e0n. Kh\u00f3a n\u00e0y sau \u0111\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thu\u1eadt to\u00e1n m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng (ch\u1eb3ng h\u1ea1n AES) \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 to\u00e0n b\u1ed9 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n trong su\u1ed1t qu\u00e1 tr\u00ecnh giao ti\u1ebfp. M\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn vi\u1ec7c trao \u0111\u1ed5i kh\u00f3a m\u1ed9t c\u00e1ch an to\u00e0n, trong khi m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng mang l\u1ea1i hi\u1ec7u su\u1ea5t cao h\u01a1n khi x\u1eed l\u00fd l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u truy\u1ec1n th\u00f4ng th\u1ef1c t\u1ebf. S\u1ef1 k\u1ebft h\u1ee3p n\u00e0y gi\u00fap \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa t\u00ednh b\u1ea3o m\u1eadt v\u00e0 hi\u1ec7u n\u0103ng trong qu\u00e1 tr\u00ecnh truy\u1ec1n th\u00f4ng.<\/p>\n<!-- AUTO_INTERNAL_LINKS_START --><p>\u0110\u1ecdc th\u00eam <a href=\"https:\/\/www.likacloud.com\/vi\/uk\/knowledge\/ssl-certificate\/what-is-ssl-certificate-website-security-trust-foundation\/\">SSL Certificate l\u00e0 g\u00ec? T\u1ea1i sao n\u00f3 l\u00e0 n\u1ec1n t\u1ea3ng thi\u1ebft y\u1ebfu cho b\u1ea3o m\u1eadt v\u00e0 s\u1ef1 tin c\u1eady c\u1ee7a website?<\/a>\u3002<\/p><!-- AUTO_INTERNAL_LINKS_END -->\n\n\n\n\n<h3 class=\"wp-block-heading\">Ch\u1eef k\u00fd s\u1ed1 v\u00e0 x\u00e1c th\u1ef1c danh t\u00ednh<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t trong nh\u1eefng ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL l\u00e0 x\u00e1c th\u1ef1c danh t\u00ednh. Qu\u00e1 tr\u00ecnh n\u00e0y d\u1ef1a tr\u00ean h\u1ec7 th\u1ed1ng C\u01a1 s\u1edf h\u1ea1 t\u1ea7ng kh\u00f3a c\u00f4ng (PKI \u2013 Public Key Infrastructure). C\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 (Certificate Authority \u2013 CA), v\u1edbi t\u01b0 c\u00e1ch l\u00e0 b\u00ean th\u1ee9 ba \u0111\u00e1ng tin c\u1eady, s\u1eed d\u1ee5ng kh\u00f3a ri\u00eang c\u1ee7a m\u00ecnh \u0111\u1ec3 k\u00fd s\u1ed1 c\u00e1c kh\u00f3a c\u00f4ng c\u1ee7a trang web c\u00f9ng v\u1edbi c\u00e1c th\u00f4ng tin li\u00ean quan (nh\u01b0 t\u00ean mi\u1ec1n, t\u00ean c\u00f4ng ty, v.v.), t\u1eeb \u0111\u00f3 t\u1ea1o ra ch\u1ee9ng ch\u1ec9 SSL. Khi ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp trang web, tr\u00ecnh duy\u1ec7t s\u1ebd t\u1ef1 \u0111\u1ed9ng t\u1ea3i ch\u1ee9ng ch\u1ec9 v\u1ec1 v\u00e0 s\u1eed d\u1ee5ng kh\u00f3a c\u00f4ng c\u1ee7a ch\u1ee9ng ch\u1ec9 g\u1ed1c (root certificate) c\u1ee7a CA \u0111\u00e3 \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef s\u1eb5n trong tr\u00ecnh duy\u1ec7t \u0111\u1ec3 x\u00e1c minh t\u00ednh h\u1ee3p l\u1ec7 c\u1ee7a ch\u1eef k\u00fd \u0111\u00f3. Qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng ng\u01b0\u1eddi d\u00f9ng \u0111ang giao ti\u1ebfp v\u1edbi m\u1ed9t t\u1ed5 ch\u1ee9c th\u1ef1c s\u1ef1 \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c minh b\u1edfi c\u01a1 quan c\u00f3 th\u1ea9m quy\u1ec1n, ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u1edbi m\u1ed9t trang web l\u1eeba \u0111\u1ea3o.<\/p>\n<!-- AUTO_SYNCED_PATTERN_INSERT_START -->\n<div class=\"grid grid-cols-1 md:grid-cols-2 gap-4 md:gap-6 mb-8 md:mb-10 mt-10\"> \r\n\t<!-- \u91cd\u590d\u5668\u5faa\u73af\u5f00\u59cb -->\r\n\t\t\r\n\t<!-- \u5546\u5bb6\u5361\u7247 -->\r\n\t<div class=\"bg-white dark:bg-gray-750 rounded-lg overflow-hidden shadow-md flex gap-1 flex-col     justify-between\" data-link=\"https:\/\/www.likacloud.com\/vi\/tolink\/bluehost-ssl-certificates\/\">\r\n\t\t<div class=\"flex items-start justify-between\"> \r\n\t\t\t<!-- \u5546\u5bb6logo -->\r\n\t\t\t<div class=\"w-16 h-16 bg-blue-200 dark:bg-blue-500\/30 flex items-center justify-center flex-shrink-0 p-3\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.likacloud.com\/wp-content\/uploads\/2025\/12\/20251231095917.webp\" alt=\"Ch\u1ee9ng ch\u1ec9 SSL Bluehost\" class=\"w-12 object-contain !dark-filter08\" title=\"\">\r\n\t\t\t\t\t\t\t\t\t\r\n\t\t\t<\/div>\r\n\t\t\t\r\n\t\t\t<!-- \u5546\u5bb6\u4fe1\u606f -->\r\n\t\t\t<div class=\"px-4 pt-2 flex-grow\">\r\n\t\t\t\t<div class=\"flex justify-between items-start mb-2\">\r\n\t\t\t\t\t<strong class=\"text-xl font-bold\">Ch\u1ee9ng ch\u1ec9 SSL Bluehost<\/strong>\r\n\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\t<span class=\"text-gray-500 dark:text-gray-300 !text-sm p-4 pb-0\">BlueHost SSL cung c\u1ea5p t\u00f9y ch\u1ecdn gia h\u1ea1n t\u1eeb 1-2 n\u0103m, h\u1ed7 tr\u1ee3 thu\u1eadt to\u00e1n RSA ho\u1eb7c ECC, \u0111\u1ed9 d\u00e0i kh\u00f3a l\u00ean \u0111\u1ebfn 4096 bit v\u00e0 b\u1ea3o hi\u1ec3m l\u00ean \u0111\u1ebfn 1,75 tri\u1ec7u USD.<\/span>\r\n\t\t\t\t<div class=\"flex flex-col gap-4 md:gap-6 justify-between p-4\"> \r\n\t\t\t<!-- \u6807\u7b7e -->\r\n\t\t\t\t\t\t\r\n\t\t\t<!-- \u6d3b\u52a8\u548c\u94fe\u63a5 --> \r\n\t\t\t<div class=\"flex justify-between items-center gap-3 flex-col\">\r\n\t\t\t\t\t\t\t\t<div class=\"text-gray-500 dark:text-gray-300 !text-sm line-clamp-1\">T\u1eeb 7,49 USD m\u1ed7i th\u00e1ng<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.likacloud.com\/vi\/tolink\/bluehost-ssl-certificates\/\" class=\"flex justify-end font-bold !text-lg !text-blue-600 dark:!text-blue-500\">Truy c\u1eadp ch\u1ee9ng ch\u1ec9 SSL Bluehost \u2192<\/a>\r\n\t\t\t\t\t\t\t<\/div> \r\n\t\t<\/div>\r\n\t<\/div>\r\n\t\t\r\n\t<!-- \u5546\u5bb6\u5361\u7247 -->\r\n\t<div class=\"bg-white dark:bg-gray-750 rounded-lg overflow-hidden shadow-md flex gap-1 flex-col     justify-between\" data-link=\"https:\/\/www.likacloud.com\/vi\/tolink\/hosting-com-ssl-certificates\/\">\r\n\t\t<div class=\"flex items-start justify-between\"> \r\n\t\t\t<!-- \u5546\u5bb6logo -->\r\n\t\t\t<div class=\"w-16 h-16 bg-blue-200 dark:bg-blue-500\/30 flex items-center justify-center flex-shrink-0 p-3\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.likacloud.com\/wp-content\/uploads\/2025\/12\/20251227070008.webp\" alt=\"Ch\u1ee9ng ch\u1ec9 SSL hosting.com\" class=\"w-12 object-contain !dark-filter08\" title=\"\">\r\n\t\t\t\t\t\t\t\t\t\r\n\t\t\t<\/div>\r\n\t\t\t\r\n\t\t\t<!-- \u5546\u5bb6\u4fe1\u606f -->\r\n\t\t\t<div class=\"px-4 pt-2 flex-grow\">\r\n\t\t\t\t<div class=\"flex justify-between items-start mb-2\">\r\n\t\t\t\t\t<strong class=\"text-xl font-bold\">Ch\u1ee9ng ch\u1ec9 SSL hosting.com<\/strong>\r\n\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\t<span class=\"text-gray-500 dark:text-gray-300 !text-sm p-4 pb-0\">Ch\u1ee9ng ch\u1ec9 SSL DV, OV, EV gi\u00e1 c\u1ea3 ph\u1ea3i ch\u0103ng, m\u00e3 h\u00f3a l\u00ean \u0111\u1ebfn 256 bit, s\u1ed1 ti\u1ec1n b\u1ea3o \u0111\u1ea3m t\u1eeb 5 ~ 100 tri\u1ec7u USD, h\u1ed7 tr\u1ee3 24\/7<\/span>\r\n\t\t\t\t<div class=\"flex flex-col gap-4 md:gap-6 justify-between p-4\"> \r\n\t\t\t<!-- \u6807\u7b7e -->\r\n\t\t\t\t\t\t\r\n\t\t\t<!-- \u6d3b\u52a8\u548c\u94fe\u63a5 --> \r\n\t\t\t<div class=\"flex justify-between items-center gap-3 flex-col\">\r\n\t\t\t\t\t\t\t\t<div class=\"text-gray-500 dark:text-gray-300 !text-sm line-clamp-1\">B\u1eaft \u0111\u1ea7u t\u1eeb $2.5 USD m\u1ed7i th\u00e1ng<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.likacloud.com\/vi\/tolink\/hosting-com-ssl-certificates\/\" class=\"flex justify-end font-bold !text-lg !text-blue-600 dark:!text-blue-500\">Truy c\u1eadp hosting.com Ch\u1ee9ng ch\u1ec9 SSL \u2192<\/a>\r\n\t\t\t\t\t\t\t<\/div> \r\n\t\t<\/div>\r\n\t<\/div>\r\n\t\t<!-- \u91cd\u590d\u5668\u5faa\u73af\u7ed3\u675f -->\r\n<\/div>\r\n\r\n\r\n\n<!-- AUTO_SYNCED_PATTERN_INSERT_END -->\n\n\n\n\n\n<h3 class=\"wp-block-heading\">Quy tr\u00ecnh thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i an to\u00e0n HTTPS<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Qu\u00e1 tr\u00ecnh thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i HTTPS, t\u1ee9c l\u00e0 b\u1eaft tay TLS, ch\u1ee7 y\u1ebfu bao g\u1ed3m c\u00e1c b\u01b0\u1edbc sau: m\u00e1y kh\u00e1ch g\u1eedi th\u00f4ng b\u00e1o \u201cClient Hello\u201d ch\u1ee9a b\u1ed9 m\u1eadt m\u00e3 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3; m\u00e1y ch\u1ee7 ph\u1ea3n h\u1ed3i v\u1edbi \u201cServer Hello\u201d, ch\u1ecdn ph\u01b0\u01a1ng th\u1ee9c m\u00e3 h\u00f3a v\u00e0 g\u1eedi ch\u1ee9ng ch\u1ec9 SSL c\u1ee7a n\u00f3; m\u00e1y kh\u00e1ch x\u00e1c minh t\u00ednh h\u1ee3p l\u1ec7 c\u1ee7a ch\u1ee9ng ch\u1ec9 v\u00e0 t\u1ea1o m\u1ed9t kh\u00f3a ch\u00ednh d\u1ef1 ph\u00f2ng, m\u00e3 h\u00f3a b\u1eb1ng kh\u00f3a c\u00f4ng khai c\u1ee7a m\u00e1y ch\u1ee7 r\u1ed3i g\u1eedi cho m\u00e1y ch\u1ee7; c\u1ea3 hai b\u00ean s\u1eed d\u1ee5ng kh\u00f3a ch\u00ednh d\u1ef1 ph\u00f2ng \u0111\u1ec3 t\u1ea1o ra c\u00f9ng m\u1ed9t kh\u00f3a phi\u00ean; sau \u0111\u00f3, s\u1eed d\u1ee5ng kh\u00f3a phi\u00ean \u0111\u1ed1i x\u1ee9ng n\u00e0y \u0111\u1ec3 b\u1eaft \u0111\u1ea7u giao ti\u1ebfp m\u00e3 h\u00f3a. To\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh \u0111\u1ea3m b\u1ea3o an to\u00e0n cho vi\u1ec7c trao \u0111\u1ed5i kh\u00f3a ban \u0111\u1ea7u v\u00e0 danh t\u00ednh \u0111\u00e1ng tin c\u1eady c\u1ee7a c\u00e1c b\u00ean giao ti\u1ebfp.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e1c lo\u1ea1i ch\u1ee9ng ch\u1ec9 SSL ch\u00ednh v\u00e0 c\u00e1ch l\u1ef1a ch\u1ecdn<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">D\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 x\u00e1c th\u1ef1c v\u00e0 y\u00eau c\u1ea7u v\u1ec1 ch\u1ee9c n\u0103ng, ch\u1ee9ng ch\u1ec9 SSL \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c lo\u1ea1i ch\u00ednh sau \u0111\u00e2y; ng\u01b0\u1eddi d\u00f9ng c\u1ea7n l\u1ef1a ch\u1ecdn lo\u1ea1i ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a trang web c\u1ee7a m\u00ecnh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ch\u1ee9ng ch\u1ec9 x\u00e1c th\u1ef1c t\u00ean mi\u1ec1n<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ee9ng ch\u1ec9 lo\u1ea1i x\u00e1c th\u1ef1c t\u00ean mi\u1ec1n (Domain Name Validation \u2013 DV) l\u00e0 lo\u1ea1i ch\u1ee9ng ch\u1ec9 SSL c\u01a1 b\u1ea3n nh\u1ea5t v\u00e0 \u0111\u01b0\u1ee3c c\u1ea5p ph\u00e1t nhanh nh\u1ea5t. C\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authority) ch\u1ec9 ki\u1ec3m tra quy\u1ec1n ki\u1ec3m so\u00e1t t\u00ean mi\u1ec1n c\u1ee7a ng\u01b0\u1eddi n\u1ed9p \u0111\u01a1n, th\u01b0\u1eddng th\u00f4ng qua vi\u1ec7c x\u00e1c minh \u0111\u1ecba ch\u1ec9 email \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh, \u0111\u1eb7t t\u1ec7p tin c\u1ee5 th\u1ec3 trong th\u01b0 m\u1ee5c g\u1ed1c c\u1ee7a t\u00ean mi\u1ec1n, ho\u1eb7c th\u00eam b\u1ea3n ghi DNS theo y\u00eau c\u1ea7u. Lo\u1ea1i ch\u1ee9ng ch\u1ec9 n\u00e0y cung c\u1ea5p ch\u1ee9c n\u0103ng m\u00e3 h\u00f3a c\u01a1 b\u1ea3n cho trang web v\u00e0 hi\u1ec3n th\u1ecb bi\u1ec3u t\u01b0\u1ee3ng kh\u00f3a trong thanh \u0111\u1ecba ch\u1ec9 tr\u00ecnh duy\u1ec7t. N\u00f3 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c trang web c\u00e1 nh\u00e2n, blog ho\u1eb7c m\u00f4i tr\u01b0\u1eddng th\u1eed nghi\u1ec7m n\u01a1i kh\u00f4ng c\u00f3 y\u00eau c\u1ea7u cao v\u1ec1 x\u00e1c th\u1ef1c danh t\u00ednh. Nh\u1edd chi ph\u00ed th\u1ea5p v\u00e0 qu\u00e1 tr\u00ecnh tri\u1ec3n khai \u0111\u01a1n gi\u1ea3n, \u0111\u00e2y l\u00e0 lo\u1ea1i ch\u1ee9ng ch\u1ec9 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ch\u1ee9ng ch\u1ec9 x\u00e1c th\u1ef1c t\u1ed5 ch\u1ee9c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Lo\u1ea1i ch\u1ee9ng ch\u1ec9 x\u00e1c th\u1ef1c t\u1ed5 ch\u1ee9c (Organizational Validation Certificate \u2013 OV Certificate) \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng d\u1ef1a tr\u00ean n\u1ec1n t\u1ea3ng c\u1ee7a ch\u1ee9ng ch\u1ec9 DV (Domain Validation Certificate), nh\u01b0ng b\u1ed5 sung th\u00eam c\u00e1c quy tr\u00ecnh ki\u1ec3m tra nghi\u00eam ng\u1eb7t h\u01a1n v\u1ec1 t\u00ednh ch\u00ednh x\u00e1c v\u00e0 t\u00ednh h\u1ee3p ph\u00e1p c\u1ee7a t\u1ed5 ch\u1ee9c n\u1ed9p \u0111\u01a1n xin c\u1ea5p ch\u1ee9ng ch\u1ec9. C\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authority) s\u1ebd ki\u1ec3m tra th\u00f4ng tin \u0111\u0103ng k\u00fd c\u1ee7a doanh nghi\u1ec7p th\u00f4ng qua c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh th\u1ee9c, bao g\u1ed3m t\u00ean c\u00f4ng ty, \u0111\u1ecba ch\u1ec9, s\u1ed1 \u0111i\u1ec7n tho\u1ea1i, v.v. Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 xem th\u00f4ng tin chi ti\u1ebft v\u1ec1 doanh nghi\u1ec7p b\u1eb1ng c\u00e1ch nh\u1ea5p v\u00e0o bi\u1ec3u t\u01b0\u1ee3ng kh\u00f3a \u1edf thanh \u0111\u1ecba ch\u1ec9 tr\u00ecnh duy\u1ec7t. S\u1ef1 minh b\u1ea1ch b\u1ed5 sung n\u00e0y gi\u00fap t\u0103ng \u0111\u00e1ng k\u1ec3 m\u1ee9c \u0111\u1ed9 tin c\u1eady \u0111\u1ed1i v\u1edbi c\u00e1c trang web doanh nghi\u1ec7p, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c n\u1ec1n t\u1ea3ng B2B (Business to Business). OV Certificate th\u01b0\u1eddng \u0111\u01b0\u1ee3c c\u00e1c c\u01a1 quan ch\u00ednh ph\u1ee7 v\u00e0 trang web ch\u00ednh th\u1ee9c c\u1ee7a doanh nghi\u1ec7p s\u1eed d\u1ee5ng \u0111\u1ec3 ch\u1ee9ng minh \u0111\u1ecbnh danh ph\u00e1p l\u00fd c\u1ee7a h\u1ecd.<\/p>\n<!-- AUTO_INTERNAL_LINKS_START --><p>\u0110\u1ecdc th\u00eam <a href=\"https:\/\/www.likacloud.com\/vi\/uk\/knowledge\/ssl-certificate\/ssl-certificate-guide-how-it-works-free-application-installation\/\">H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 ch\u1ee9ng ch\u1ec9 SSL: T\u1eeb nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng \u0111\u1ebfn quy tr\u00ecnh c\u00e0i \u0111\u1eb7t mi\u1ec5n ph\u00ed<\/a>\u3002<\/p><!-- AUTO_INTERNAL_LINKS_END -->\n\n\n\n\n<h3 class=\"wp-block-heading\">Ch\u1ee9ng ch\u1ec9 x\u00e1c th\u1ef1c m\u1edf r\u1ed9ng<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ee9ng ch\u1ec9 SSL lo\u1ea1i Extended Validation (EV) l\u00e0 lo\u1ea1i ch\u1ee9ng ch\u1ec9 c\u00f3 m\u1ee9c \u0111\u1ed9 x\u00e1c th\u1ef1c ch\u1eb7t ch\u1ebd nh\u1ea5t v\u00e0 \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao nh\u1ea5t v\u1ec1 m\u1ee9c \u0111\u1ed9 tin c\u1eady. Ngo\u00e0i vi\u1ec7c ho\u00e0n th\u00e0nh qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c t\u1ed5 ch\u1ee9c \u1edf c\u1ea5p \u0111\u1ed9 OV (Organizational Validation), c\u00e1c t\u1ed5 ch\u1ee9c cung c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authorities) c\u00f2n ti\u1ebfn h\u00e0nh ki\u1ec3m tra th\u1ee7 c\u00f4ng k\u1ef9 l\u01b0\u1ee1ng h\u01a1n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ed5 ch\u1ee9c \u0111\u00f3 th\u1ef1c s\u1ef1 t\u1ed3n t\u1ea1i v\u1ec1 m\u1eb7t ph\u00e1p l\u00fd v\u00e0 v\u1eadt l\u00fd. \u0110\u1eb7c \u0111i\u1ec3m n\u1ed5i b\u1eadt nh\u1ea5t c\u1ee7a ch\u1ee9ng ch\u1ec9 EV l\u00e0 thanh \u0111\u1ecba ch\u1ec9 tr\u00ean tr\u00ecnh duy\u1ec7t s\u1ebd chuy\u1ec3n sang m\u00e0u xanh l\u00e1 (m\u1eb7c d\u00f9 c\u00f3 th\u1ec3 c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t nh\u1ecf \u1edf m\u1ed9t s\u1ed1 tr\u00ecnh duy\u1ec7t hi\u1ec7n \u0111\u1ea1i), v\u00e0 t\u00ean c\u00f4ng ty \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c s\u1ebd \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u1ef1c ti\u1ebfp. \u0110i\u1ec1u n\u00e0y c\u1ef1c k\u1ef3 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c t\u1ed5 ch\u1ee9c t\u00e0i ch\u00ednh, c\u00e1c n\u1ec1n t\u1ea3ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed l\u1edbn, v\u00e0 nh\u1eefng trang web y\u00eau c\u1ea7u m\u1ee9c \u0111\u1ed9 tin c\u1eady cao t\u1eeb ng\u01b0\u1eddi d\u00f9ng; n\u00f3 gi\u00fap n\u00e2ng cao \u0111\u00e1ng k\u1ec3 c\u1ea3m gi\u00e1c an to\u00e0n c\u1ee7a ng\u01b0\u1eddi d\u00f9ng v\u00e0 t\u1ef7 l\u1ec7 chuy\u1ec3n \u0111\u1ed5i giao d\u1ecbch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ch\u1ee9ng ch\u1ec9 k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n v\u00e0 ch\u1ee9ng ch\u1ec9 \u0111a t\u00ean mi\u1ec1n<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ee9ng ch\u1ec9 s\u1eed d\u1ee5ng k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n (wildcard) s\u1eed d\u1ee5ng d\u1ea5u sao (*) \u0111\u1ec3 b\u1ea3o v\u1ec7 m\u1ed9t t\u00ean mi\u1ec1n ch\u00ednh c\u00f9ng t\u1ea5t c\u1ea3 c\u00e1c t\u00ean mi\u1ec1n con c\u00f9ng c\u1ea5p v\u1edbi n\u00f3. V\u00ed d\u1ee5, m\u1ed9t ch\u1ee9ng ch\u1ec9 \u0111\u01b0\u1ee3c c\u1ea5p cho \u201c_.example.com\u201d c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c t\u00ean mi\u1ec1n nh\u01b0 \u201cblog.example.com\u201d, \u201cshop.example.com\u201d, \u201cmail.example.com\u201d, v.v. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 ph\u1ee9c t\u1ea1p v\u00e0 chi ph\u00ed trong vi\u1ec7c qu\u1ea3n l\u00fd nhi\u1ec1u t\u00ean mi\u1ec1n con. Ch\u1ee9ng ch\u1ec9 \u0111a t\u00ean mi\u1ec1n, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ch\u1ee9ng ch\u1ec9 SAN (Subject Alternative Name) ho\u1eb7c ch\u1ee9ng ch\u1ec9 UCC (Unified Communications Certificate), cho ph\u00e9p b\u1ea3o v\u1ec7 nhi\u1ec1u t\u00ean mi\u1ec1n kh\u00e1c nhau trong c\u00f9ng m\u1ed9t ch\u1ee9ng ch\u1ec9 (ch\u1eb3ng h\u1ea1n: example.com, example.net, anotherexample.org). C\u1ea3 hai lo\u1ea1i ch\u1ee9ng ch\u1ec9 n\u00e0y \u0111\u1ec1u cung c\u1ea5p gi\u1ea3i ph\u00e1p b\u1ea3o m\u1eadt linh ho\u1ea1t v\u00e0 ti\u1ebft ki\u1ec7m chi ph\u00ed cho c\u00e1c c\u1ea5u tr\u00fac h\u1ea1 t\u1ea7ng ph\u1ee9c t\u1ea1p.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 xin v\u00e0 tri\u1ec3n khai ch\u1ee9ng ch\u1ec9 SSL<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 th\u00e0nh c\u00f4ng trong vi\u1ec7c thu \u0111\u01b0\u1ee3c v\u00e0 k\u00edch ho\u1ea1t ch\u1ee9ng ch\u1ec9 SSL, c\u1ea7n th\u1ef1c hi\u1ec7n m\u1ed9t lo\u1ea1t c\u00e1c b\u01b0\u1edbc ti\u00eau chu\u1ea9n h\u00f3a. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 h\u01b0\u1edbng d\u1eabn chung v\u1ec1 quy tr\u00ecnh n\u1ed9p \u0111\u01a1n v\u00e0 tri\u1ec3n khai.<\/p>\n<!-- AUTO_SYNCED_PATTERN_INSERT_START -->\n\n  <div class=\"flex justify-between items-center flex-col lg:flex-row xl:flex-col 2xl:flex-row gap-6 sm:gap-8 rounded-lg border border-gray-200 dark:border-gray-700 p-4 mb-8 lg:mb-10 sm:p-6 bg-white dark:bg-gray-750 shadow-md transition-colors duration-300\"\n         data-link=\"https:\/\/www.likacloud.com\/vi\/tolink\/ultahost-ssl-certificates\/\">\n\n      <div class=\"flex flex-col gap-3 gap-4 sm:gap-6 w-full\">\n        <strong class=\"text-2xl font-semibold text-gray-900 dark:text-gray-200\">Ch\u1ee9ng ch\u1ec9 SSL c\u1ee7a UltaHost<\/strong>\n        <div class=\"text-gray-600 dark:text-gray-300 word-word\">Ch\u1ee9ng ch\u1ec9 DV, EV, OV, h\u1ed7 tr\u1ee3 m\u1ee9c b\u1ea3o hi\u1ec3m t\u1ed1i \u0111a $1,750,000 USD, h\u1ed7 tr\u1ee3 v\u00f4 s\u1ed1 t\u00ean mi\u1ec1n ph\u1ee5, h\u1ed7 tr\u1ee3 c\u00e1c \u1ee9ng d\u1ee5ng iOS v\u00e0 Android, \u01b0u \u0111\u00e3i gi\u00e1 t\u1eeb 20% m\u1ed7i th\u00e1ng, v\u1edbi m\u1ee9c ph\u00ed $15,95 USD, b\u1ea3o l\u00e3nh ho\u00e0n ti\u1ec1n trong v\u00f2ng 30 ng\u00e0y.<\/div>\n      <\/div>\n\n      <div class=\"flex items-center flex-col md:flex-row lg:flex-col xl:flex-row 2xl:flex-col gap-6 shrink-0\">\n                  <a href=\"https:\/\/www.likacloud.com\/vi\/tolink\/ultahost-ssl-certificates\/\">\n                          <!-- \u767d\u5929 -->\n              <img decoding=\"async\" src=\"https:\/\/www.likacloud.com\/wp-content\/uploads\/2025\/12\/20251227020448.webp\" alt=\"Logo ch\u1ee9ng ch\u1ec9 SSL\" class=\"content-promotion-card-icon h-9 min-h-9 dark:hidden\" title=\"\">\n              <!-- \u591c\u95f4 -->\n              <img decoding=\"async\" src=\"https:\/\/www.likacloud.com\/wp-content\/uploads\/2025\/12\/20251229052118.webp\" alt=\"Logo ch\u1ee9ng ch\u1ec9 SSL\" class=\"content-promotion-card-icon h-9 min-h-9 hidden dark:block\" title=\"\">\n                      <\/a>\n          \n        <a href=\"https:\/\/www.likacloud.com\/vi\/tolink\/ultahost-ssl-certificates\/\"\n           class=\"bg-blue-500 w-full md:w-auto lg:w-full xl:w-auto 2xl:w-full text-center !text-white dark:!text-gray-200 !px-5 !py-1.5 rounded-full hover:bg-blue-600 transition-colors\">\n          Truy c\u1eadp UltaHost        <\/a>\n      <\/div>\n    <\/div>\n\n    \n<!-- AUTO_SYNCED_PATTERN_INSERT_END -->\n\n\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 1: T\u1ea1o Y\u00eau c\u1ea7u K\u00fd Ch\u1ee9ng ch\u1ec9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Y\u00eau c\u1ea7u k\u00fd ch\u1ee9ng ch\u1ec9 (Certificate Signing Request \u2013 CSR) l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean trong qu\u00e1 tr\u00ecnh xin c\u1ea5p ch\u1ee9ng ch\u1ec9, v\u00e0 c\u1ea7n \u0111\u01b0\u1ee3c t\u1ea1o ra tr\u00ean m\u00e1y ch\u1ee7 c\u1ee7a b\u1ea1n. Qu\u00e1 tr\u00ecnh n\u00e0y s\u1ebd t\u1ea1o ra hai t\u1ec7p quan tr\u1ecdng: m\u1ed9t t\u1ec7p CSR ch\u1ee9a kh\u00f3a c\u00f4ng khai c\u1ee7a b\u1ea1n v\u00e0 th\u00f4ng tin m\u00e1y ch\u1ee7, c\u00f9ng v\u1edbi m\u1ed9t t\u1ec7p kh\u00f3a ri\u00eang t\u01b0\u01a1ng \u1ee9ng c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o m\u1eadt nghi\u00eam ng\u1eb7t. B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n qu\u1ea3n tr\u1ecb m\u00e1y ch\u1ee7 (nh\u01b0 cPanel, Plesk), c\u00e1c c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh (nh\u01b0 OpenSSL) ho\u1eb7c c\u00e1c c\u00f4ng c\u1ee5 chuy\u00ean d\u1ee5ng \u0111\u1ec3 t\u1ea1o CSR. Trong qu\u00e1 tr\u00ecnh t\u1ea1o CSR, b\u1ea1n c\u1ea7n \u0111i\u1ec1n ch\u00ednh x\u00e1c c\u00e1c th\u00f4ng tin nh\u01b0 qu\u1ed1c gia, t\u1ec9nh\/th\u00e0nh ph\u1ed1, t\u00ean t\u1ed5 ch\u1ee9c, v\u00e0 t\u00ean mi\u1ec1n c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7. B\u1ea5t k\u1ef3 sai s\u00f3t n\u00e0o \u0111\u1ec1u c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c y\u00eau c\u1ea7u xin ch\u1ee9ng ch\u1ec9 b\u1ecb t\u1eeb ch\u1ed1i ho\u1eb7c b\u1ecb tr\u00ecnh duy\u1ec7t coi l\u00e0 kh\u00f4ng \u0111\u00fang th\u00f4ng tin.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc hai: N\u1ed9p \u0111\u01a1n v\u00e0 x\u00e1c minh cho CA<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">H\u00e3y g\u1eedi t\u1ec7p CSR (Certificate Signing Request) \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o ra \u0111\u1ebfn c\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 m\u00e0 b\u1ea1n \u0111\u00e3 ch\u1ecdn, ho\u1eb7c \u0111\u1ebfn \u0111\u1ea1i l\u00fd c\u1ee7a h\u1ecd. T\u00f9y thu\u1ed9c v\u00e0o lo\u1ea1i ch\u1ee9ng ch\u1ec9 m\u00e0 b\u1ea1n mua, c\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authority) s\u1ebd b\u1eaft \u0111\u1ea7u quy tr\u00ecnh x\u00e1c th\u1ef1c t\u01b0\u01a1ng \u1ee9ng: \u0111\u1ed1i v\u1edbi ch\u1ee9ng ch\u1ec9 DV (Domain Validation), qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c t\u00ean mi\u1ec1n th\u01b0\u1eddng \u0111\u01b0\u1ee3c ho\u00e0n t\u1ea5t v\u00e0 ch\u1ee9ng ch\u1ec9 \u0111\u01b0\u1ee3c c\u1ea5p trong v\u00f2ng v\u00e0i ph\u00fat \u0111\u1ebfn v\u00e0i gi\u1edd; \u0111\u1ed1i v\u1edbi ch\u1ee9ng ch\u1ec9 OV\/EV (Organizational Validation\/Extended Validation), c\u1ea7n th\u1eddi gian t\u1eeb v\u00e0i ng\u00e0y \u0111\u1ec3 ti\u1ebfn h\u00e0nh ki\u1ec3m tra th\u1ee7 c\u00f4ng. Trong th\u1eddi gian x\u00e1c th\u1ef1c, vui l\u00f2ng \u0111\u1ea3m b\u1ea3o tr\u1ea3 l\u1eddi k\u1ecbp th\u1eddi c\u00e1c y\u00eau c\u1ea7u x\u00e1c nh\u1eadn m\u00e0 CA c\u00f3 th\u1ec3 g\u1eedi \u0111\u1ebfn b\u1ea1n qua email ho\u1eb7c \u0111i\u1ec7n tho\u1ea1i. Sau khi qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c ho\u00e0n t\u1ea5t, CA s\u1ebd g\u1eedi t\u1ec7p ch\u1ee9ng ch\u1ec9 SSL \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5p (th\u01b0\u1eddng \u1edf \u0111\u1ecbnh d\u1ea1ng.crt ho\u1eb7c.pem, c\u00f3 th\u1ec3 k\u00e8m theo t\u1ec7p chu\u1ed7i ch\u1ee9ng ch\u1ec9 \u2013 certificate chain) \u0111\u1ebfn b\u1ea1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc ba: C\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9 tr\u00ean m\u00e1y ch\u1ee7<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sau khi nh\u1eadn \u0111\u01b0\u1ee3c t\u1ec7p ch\u1ee9ng ch\u1ec9, b\u1ea1n c\u1ea7n c\u00e0i \u0111\u1eb7t n\u00f3 c\u00f9ng v\u1edbi t\u1ec7p kh\u00f3a ri\u00eang \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o tr\u01b0\u1edbc \u0111\u00f3 l\u00ean m\u00e1y ch\u1ee7 Web. C\u00e1ch th\u1ee9c c\u00e0i \u0111\u1eb7t s\u1ebd kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o ph\u1ea7n m\u1ec1m m\u00e1y ch\u1ee7: \u0111\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 Apache, th\u01b0\u1eddng c\u1ea7n ph\u1ea3i th\u1ef1c hi\u1ec7n m\u1ed9t s\u1ed1 thay \u0111\u1ed5i trong c\u1ea5u h\u00ecnh c\u1ee7a m\u00e1y ch\u1ee7.<code data-no-auto-translation=\"\">httpd.conf<\/code>ho\u1eb7c trang web<code data-no-auto-translation=\"\">.conf<\/code>t\u1ec7p, ch\u1ec9 \u0111\u1ecbnh<code data-no-auto-translation=\"\">SSLCertificateFile<\/code>(Certificate file) v\u00e0<code data-no-auto-translation=\"\">SSLCertificateKeyFile<\/code>\u0110\u01b0\u1eddng d\u1eabn t\u1edbi t\u1ec7p kh\u00f3a ri\u00eang; \u0111\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 Nginx, h\u00e3y thay \u0111\u1ed5i t\u1ec7p c\u1ea5u h\u00ecnh trang web.<code data-no-auto-translation=\"\">ssl_certificate<\/code>\u548c<code data-no-auto-translation=\"\">ssl_certificate_key<\/code>H\u00e3y ch\u1ec9 \u0111\u1ecbnh \u0111\u01b0\u1eddng d\u1eabn t\u01b0\u01a1ng \u1ee9ng sau l\u1ec7nh. H\u00e3y \u0111\u1ea3m b\u1ea3o r\u1eb1ng quy\u1ec1n truy c\u1eadp v\u00e0o t\u1ec7p kh\u00f3a ri\u00eang \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp m\u1ed9t c\u00e1ch nghi\u00eam ng\u1eb7t \u0111\u1ec3 ng\u0103n ch\u1eb7n vi\u1ec7c truy c\u1eadp tr\u00e1i ph\u00e9p.<\/p>\n<!-- AUTO_INTERNAL_LINKS_START --><p>\u0110\u1ecdc th\u00eam <a href=\"https:\/\/www.likacloud.com\/vi\/uk\/knowledge\/ssl-certificate\/ssl-certificate-role-and-value\/\">T\u00e1c d\u1ee5ng v\u00e0 gi\u00e1 tr\u1ecb c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL<\/a>\u3002<\/p><!-- AUTO_INTERNAL_LINKS_END -->\n\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc th\u1ee9 t\u01b0: C\u1ea5u h\u00ecnh chuy\u1ec3n h\u01b0\u1edbng v\u00e0 b\u1eaft bu\u1ed9c s\u1eed d\u1ee5ng giao th\u1ee9c HTTPS<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sau khi c\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9 v\u00e0 ki\u1ec3m tra xem vi\u1ec7c truy c\u1eadp qua HTTPS c\u00f3 ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng kh\u00f4ng, b\u01b0\u1edbc cu\u1ed1i c\u00f9ng l\u00e0 c\u1ea5u h\u00ecnh \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n h\u01b0\u1edbng to\u00e0n b\u1ed9 l\u01b0u l\u01b0\u1ee3ng HTTP sang HTTPS. \u0110i\u1ec1u n\u00e0y s\u1ebd \u0111\u1ea3m b\u1ea3o r\u1eb1ng ngay c\u1ea3 khi ng\u01b0\u1eddi d\u00f9ng s\u1eed d\u1ee5ng c\u00e1c li\u00ean k\u1ebft HTTP c\u0169, h\u1ecd v\u1eabn s\u1ebd \u0111\u01b0\u1ee3c \u0111\u01b0a \u0111\u1ebfn phi\u00ean b\u1ea3n \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a m\u1ed9t c\u00e1ch an to\u00e0n. Trong Apache, b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c t\u00f9y ch\u1ecdn c\u1ea5u h\u00ecnh t\u01b0\u01a1ng \u1ee9ng.<code data-no-auto-translation=\"\">mod_rewrite<\/code>Vi\u1ec7c tri\u1ec3n khai quy t\u1eafc RewriteRule trong c\u00e1c module l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh c\u00e1ch x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u HTTP. Trong Nginx, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c quy t\u1eafc n\u00e0y \u0111\u1ec3 y\u00eau c\u1ea7u m\u00e1y ch\u1ee7 chuy\u1ec3n h\u01b0\u1edbng (redirect) ng\u01b0\u1eddi d\u00f9ng \u0111\u1ebfn m\u1ed9t \u0111\u1ecba ch\u1ec9 m\u1edbi b\u1eb1ng c\u00e1ch tr\u1ea3 v\u1ec1 m\u00e3 tr\u1ea1ng th\u00e1i 301 (Moved Permanently). V\u00ed<code data-no-auto-translation=\"\">server<\/code>Kh\u1ed1i (block), \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u00ean trong\u2026<code data-no-auto-translation=\"\">rewrite<\/code>H\u00e3y th\u1ef1c hi\u1ec7n l\u1ec7nh y\u00eau c\u1ea7u ho\u1eb7c tr\u1ea3 v\u1ec1 tr\u1ea1ng th\u00e1i 301 \u0111\u1ec3 chuy\u1ec3n h\u01b0\u1edbng ng\u01b0\u1eddi d\u00f9ng \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 HTTPS. Ch\u1ec9 sau khi ho\u00e0n t\u1ea5t b\u01b0\u1edbc n\u00e0y, qu\u00e1 tr\u00ecnh di chuy\u1ec3n to\u00e0n b\u1ed9 trang web sang giao th\u1ee9c HTTPS m\u1edbi \u0111\u01b0\u1ee3c coi l\u00e0 ho\u00e0n t\u1ea5t.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u1ea3n l\u00fd ch\u1ee9ng ch\u1ec9 SSL v\u00e0 c\u00e1c th\u1ef1c ti\u1ec5n t\u1ed1t nh\u1ea5t<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c tri\u1ec3n khai ch\u1ee9ng ch\u1ec9 SSL kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t l\u1ea7n duy nh\u1ea5t; vi\u1ec7c qu\u1ea3n l\u00fd ch\u00fang m\u1ed9t c\u00e1ch th\u01b0\u1eddng xuy\u00ean v\u00e0 tu\u00e2n th\u1ee7 c\u00e1c th\u1ef1c h\u00e0nh b\u1ea3o m\u1eadt t\u1ed1t nh\u1ea5t l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 duy tr\u00ec tr\u1ea1ng th\u00e1i an to\u00e0n l\u00e2u d\u00e0i.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Gi\u00e1m s\u00e1t th\u1eddi h\u1ea1n hi\u1ec7u l\u1ef1c v\u00e0 gia h\u1ea1n k\u1ecbp th\u1eddi<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed7i ch\u1ee9ng ch\u1ec9 SSL \u0111\u1ec1u c\u00f3 th\u1eddi h\u1ea1n s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3 (hi\u1ec7n nay th\u01b0\u1eddng l\u00e0 398 ng\u00e0y). Khi h\u1ebft h\u1ea1n, trang web s\u1ebd kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp qua giao th\u1ee9c HTTPS v\u00e0 c\u00e1c c\u1ea3nh b\u00e1o b\u1ea3o m\u1eadt nghi\u00eam tr\u1ecdng s\u1ebd xu\u1ea5t hi\u1ec7n tr\u00ean tr\u00ecnh duy\u1ec7t. B\u1ea1n c\u1ea7n s\u1eed d\u1ee5ng l\u1ecbch nh\u1eafc nh\u1edf, c\u00f4ng c\u1ee5 gi\u00e1m s\u00e1t ho\u1eb7c d\u1ecbch v\u1ee5 t\u1ef1 \u0111\u1ed9ng gia h\u1ea1n do nh\u00e0 cung c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA) cung c\u1ea5p \u0111\u1ec3 theo d\u00f5i th\u1eddi h\u1ea1n hi\u1ec7u l\u1ef1c c\u1ee7a ch\u1ee9ng ch\u1ec9. \u0110\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb b\u1eaft \u0111\u1ea7u qu\u00e1 tr\u00ecnh gia h\u1ea1n \u00edt nh\u1ea5t 30 ng\u00e0y tr\u01b0\u1edbc khi ch\u1ee9ng ch\u1ec9 h\u1ebft h\u1ea1n, \u0111\u1ec3 c\u00f3 \u0111\u1ee7 th\u1eddi gian th\u1ef1c hi\u1ec7n c\u00e1c b\u01b0\u1edbc x\u00e1c th\u1ef1c v\u00e0 tri\u1ec3n khai c\u1ea7n thi\u1ebft, nh\u1eb1m tr\u00e1nh s\u1ef1 gi\u00e1n \u0111o\u1ea1n d\u1ecbch v\u1ee5 do t\u00ecnh tr\u1ea1ng \u201cch\u1ee9ng ch\u1ec9 h\u1ebft h\u1ea1n\u201d (certificate expiration).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u1eadt B\u1ea3o m\u1eadt Truy\u1ec1n t\u1ea3i Nghi\u00eam ng\u1eb7t HTTP<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HSTS (HTTP Strict Transport Security) l\u00e0 m\u1ed9t c\u01a1 ch\u1ebf ch\u00ednh s\u00e1ch b\u1ea3o m\u1eadt quan tr\u1ecdng. N\u00f3 th\u00f4ng b\u00e1o cho tr\u00ecnh duy\u1ec7t th\u00f4ng qua m\u1ed9t ti\u00eau \u0111\u1ec1 ph\u1ea3n h\u1ed3i HTTP \u0111\u1eb7c bi\u1ec7t r\u1eb1ng trang web ch\u1ec9 n\u00ean \u0111\u01b0\u1ee3c truy c\u1eadp th\u00f4ng qua giao th\u1ee9c HTTPS trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh. Ngay c\u1ea3 khi ng\u01b0\u1eddi d\u00f9ng nh\u1eadp \u0111\u1ecba ch\u1ec9 trang web th\u1ee7 c\u00f4ng\u2026<code data-no-auto-translation=\"\">http:\/\/<\/code>Ho\u1eb7c b\u1ea1n c\u00f3 th\u1ec3 nh\u1ea5p v\u00e0o m\u1ed9t li\u00ean k\u1ebft HTTP; tr\u00ecnh duy\u1ec7t s\u1ebd t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n \u0111\u1ed5i n\u1ed9i dung c\u1ee7a li\u00ean k\u1ebft \u0111\u00f3 th\u00e0nh d\u1ea1ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u00ean m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n.<code data-no-auto-translation=\"\">https:\/\/<\/code>Y\u00eau c\u1ea7u n\u00e0y s\u1ebd gi\u00fap b\u1ea3o v\u1ec7 hi\u1ec7u qu\u1ea3 ch\u1ed1ng l\u1ea1i c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng c\u1ee7a k\u1ebb trung gian nh\u01b0 vi\u1ec7c \u201cb\u00f3c t\u00e1ch\u201d th\u00f4ng tin SSL (SSL stripping) v\u00e0 n\u00e2ng cao m\u1ee9c \u0111\u1ed9 b\u1ea3o m\u1eadt. B\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch th\u00eam c\u00e1c c\u1ea5u h\u00ecnh t\u01b0\u01a1ng \u1ee9ng v\u00e0o m\u00e1y ch\u1ee7 web c\u1ee7a m\u00ecnh.<code data-no-auto-translation=\"\">Strict-Transport-Security<\/code>v\u00e0o c\u1ea5u h\u00ecnh m\u00e1y ch\u1ee7 c\u1ee7a b\u1ea1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L\u1ef1a ch\u1ecdn thu\u1eadt to\u00e1n m\u00e3 h\u00f3a v\u00e0 \u0111\u1ed9 m\u1ea1nh c\u1ee7a kh\u00f3a ph\u00f9 h\u1ee3p<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c l\u1ef1a ch\u1ecdn thu\u1eadt to\u00e1n m\u00e3 h\u00f3a tr\u1ef1c ti\u1ebfp \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 an ninh. N\u00ean \u01b0u ti\u00ean s\u1eed d\u1ee5ng c\u00e1c b\u1ed9 thu\u1eadt to\u00e1n hi\u1ec7n \u0111\u1ea1i v\u00e0 m\u1ea1nh m\u1ebd. V\u1ec1 \u0111\u1ed9 d\u00e0i kh\u00f3a ri\u00eang t\u01b0, kh\u00f3a RSA n\u00ean c\u00f3 \u0111\u1ed9 d\u00e0i \u00edt nh\u1ea5t 2048 bit, kh\u00f3a ECC \u00edt nh\u1ea5t 256 bit. Trong c\u1ea5u h\u00ecnh TLS, h\u00e3y v\u00f4 hi\u1ec7u h\u00f3a c\u00e1c phi\u00ean b\u1ea3n giao th\u1ee9c l\u1ed7i th\u1eddi ho\u1eb7c kh\u00f4ng an to\u00e0n (nh\u01b0 SSL 2.0\/3.0, th\u1eadm ch\u00ed l\u00e0 TLS 1.0\/1.1), v\u00e0 \u01b0u ti\u00ean s\u1eed d\u1ee5ng TLS 1.2 ho\u1eb7c c\u00e1c phi\u00ean b\u1ea3n m\u1edbi h\u01a1n. \u0110\u1ed3ng th\u1eddi, c\u1ea7n c\u1ea5u h\u00ecnh c\u1ea9n th\u1eadn danh s\u00e1ch b\u1ed9 m\u00e3 h\u00f3a m\u00e0 m\u00e1y ch\u1ee7 h\u1ed7 tr\u1ee3, \u01b0u ti\u00ean nh\u1eefng b\u1ed9 m\u00e3 h\u00f3a h\u1ed7 tr\u1ee3 t\u00ednh b\u1ea3o m\u1eadt m\u1ed9t chi\u1ec1u (forward secrecy) \u0111\u1ec3 n\u00e2ng cao \u0111\u1ed9 an to\u00e0n l\u00e2u d\u00e0i. B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 ki\u1ec3m tra tr\u1ef1c tuy\u1ebfn \u0111\u1ec3 \u0111\u1ecbnh k\u1ef3 ki\u1ec3m tra m\u1ee9c \u0111\u1ed9 c\u1ea5u h\u00ecnh SSL c\u1ee7a m\u00e1y ch\u1ee7.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tri\u1ec3n khai t\u00ednh minh b\u1ea1ch v\u00e0 qu\u1ea3n l\u00fd t\u1ef1 \u0111\u1ed9ng h\u00f3a cho c\u00e1c ch\u1ee9ng ch\u1ec9 (Certificates)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bc1\u4e66\u900f\u660e\u5ea6\u662f\u4e00\u9879\u65e8\u5728\u76d1\u6d4b\u548c\u5ba1\u8ba1SSL\u8bc1\u4e66\u7b7e\u53d1\u7684\u5f00\u653e\u6846\u67b6\u3002\u901a\u8fc7\u5c06\u7b7e\u53d1\u7684\u8bc1\u4e66\u8bb0\u5f55\u5230\u516c\u5f00\u7684\u3001\u9632\u7be1\u6539\u7684CT\u65e5\u5fd7\u4e2d\uff0c\u53ef\u4ee5\u5e2e\u52a9\u5feb\u901f\u53d1\u73b0\u9519\u8bef\u7b7e\u53d1\u6216\u6076\u610f\u7684\u8bc1\u4e66\u3002\u8bb8\u591aCA\u4f1a\u81ea\u52a8\u4e3a\u8bc1\u4e66\u63d0\u4ea4CT\u65e5\u5fd7\u3002\u5bf9\u4e8e\u62e5\u6709\u5927\u91cf\u8bc1\u4e66\u6216\u52a8\u6001\u57fa\u7840\u8bbe\u65bd\uff08\u5982\u4f7f\u7528\u5bb9\u5668\u3001\u5fae\u670d\u52a1\uff09\u7684\u7ec4\u7ec7\uff0c\u8003\u8651\u91c7\u7528\u81ea\u52a8\u5316\u8bc1\u4e66\u7ba1\u7406\u5de5\u5177\uff08\u5982Let\u2019s Encrypt\u7684Certbot\uff09\u662f\u7406\u60f3\u9009\u62e9\u3002\u5b83\u4eec\u53ef\u4ee5\u81ea\u52a8\u5904\u7406\u8bc1\u4e66\u7684\u7533\u8bf7\u3001\u9a8c\u8bc1\u3001\u5b89\u88c5\u3001\u7eed\u8ba2\u548c\u914d\u7f6e\u66f4\u65b0\uff0c\u6781\u5927\u5730\u51cf\u8f7b\u8fd0\u7ef4\u8d1f\u62c5\u5e76\u675c\u7edd\u56e0\u9057\u5fd8\u7eed\u8ba2\u5bfc\u81f4\u7684\u4e8b\u6545\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">T\u00f3m l\u1ea1i<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SSL ch\u1ee9ng ch\u1ec9 l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a an ninh m\u1ea1ng hi\u1ec7n \u0111\u1ea1i. N\u00f3 s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a tinh vi v\u00e0 h\u1ec7 th\u1ed1ng x\u00e1c th\u1ef1c danh t\u00ednh nghi\u00eam ng\u1eb7t \u0111\u1ec3 thi\u1ebft l\u1eadp m\u1ed9t k\u00eanh truy\u1ec1n th\u00f4ng an to\u00e0n v\u00e0 \u0111\u00e1ng tin c\u1eady gi\u1eefa ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u00e1y ch\u1ee7. T\u1eeb vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c nguy\u00ean l\u00fd m\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng v\u00e0 PKI \u0111\u1eb1ng sau SSL, \u0111\u1ebfn vi\u1ec7c l\u1ef1a ch\u1ecdn lo\u1ea1i ch\u1ee9ng ch\u1ec9 ph\u00f9 h\u1ee3p (DV, OV, EV ho\u1eb7c d\u1ea1ng k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n \u2013 wildcard) d\u1ef1a tr\u00ean nhu c\u1ea7u, cho \u0111\u1ebfn quy tr\u00ecnh ho\u00e0n ch\u1ec9nh t\u1eeb vi\u1ec7c t\u1ea1o CSR (Certificate Signing Request), x\u00e1c th\u1ef1c b\u1edfi CA (Certificate Authority), \u0111\u1ebfn vi\u1ec7c c\u00e0i \u0111\u1eb7t v\u00e0 tri\u1ec3n khai tr\u00ean m\u00e1y ch\u1ee7, m\u1ecdi b\u01b0\u1edbc \u0111\u1ec1u \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u qu\u1ea3 an ninh cu\u1ed1i c\u00f9ng. Vi\u1ec7c qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi ch\u1ee9ng ch\u1ec9 sau khi tri\u1ec3n khai \u2013 bao g\u1ed3m theo d\u00f5i, gia h\u1ea1n, k\u00edch ho\u1ea1t ch\u1ee9c n\u0103ng HSTS (HTTP Strict Security Transport), t\u1ed1i \u01b0u h\u00f3a c\u1ea5u h\u00ecnh m\u00e3 h\u00f3a, v\u00e0 \u00e1p d\u1ee5ng c\u00e1c c\u00f4ng ngh\u1ec7 t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u0169ng nh\u01b0 t\u0103ng t\u00ednh minh b\u1ea1ch c\u1ee7a ch\u1ee9ng ch\u1ec9 \u2013 l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t \u0111\u1ec3 bi\u1ebfn vi\u1ec7c \u0111\u1ea3m b\u1ea3o an ninh t\u1eeb m\u1ed9t d\u1ef1 \u00e1n m\u1ed9t l\u1ea7n th\u00e0nh m\u1ed9t qu\u00e1 tr\u00ecnh li\u00ean t\u1ee5c. D\u00f9 b\u1ea1n l\u00e0 qu\u1ea3n tr\u1ecb vi\u00ean trang web c\u00e1 nh\u00e2n hay IT c\u1ee7a doanh nghi\u1ec7p, vi\u1ec7c \u00e1p d\u1ee5ng c\u00f3 h\u1ec7 th\u1ed1ng nh\u1eefng ki\u1ebfn th\u1ee9c v\u00e0 th\u1ef1c h\u00e0nh li\u00ean quan \u0111\u1ebfn SSL ch\u1ee9ng ch\u1ec9 s\u1ebd gi\u00fap x\u00e2y d\u1ef1ng m\u1ed9t h\u00e0ng r\u00e0o an ninh v\u1eefng ch\u1eafc cho trang web c\u1ee7a b\u1ea1n, t\u1eeb \u0111\u00f3 gi\u00e0nh \u0111\u01b0\u1ee3c v\u00e0 duy tr\u00ec s\u1ef1 tin t\u01b0\u1edfng qu\u00fd b\u00e1u c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ \u5e38\u89c1\u95ee\u9898<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Trang web kh\u00f4ng tham gia v\u00e0o c\u00e1c giao d\u1ecbch, nh\u01b0ng v\u1eabn c\u1ea7n ph\u1ea3i c\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9 SSL sao?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00e2ng, \u0111i\u1ec1u n\u00e0y th\u1ef1c s\u1ef1 r\u1ea5t c\u1ea7n thi\u1ebft. Ngo\u00e0i vi\u1ec7c b\u1ea3o v\u1ec7 m\u1eadt kh\u1ea9u \u0111\u0103ng nh\u1eadp, th\u00f4ng tin c\u00e1 nh\u00e2n v\u00e0 c\u00e1c d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m kh\u00e1c, vi\u1ec7c c\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9 SSL \u0111\u00e3 tr\u1edf th\u00e0nh ti\u00eau chu\u1ea9n cho c\u00e1c trang web hi\u1ec7n \u0111\u1ea1i. Nh\u1eefng trang web kh\u00f4ng s\u1eed d\u1ee5ng HTTPS s\u1ebd b\u1ecb h\u1ea7u h\u1ebft c\u00e1c tr\u00ecnh duy\u1ec7t ph\u1ed5 bi\u1ebfn \u0111\u00e1nh d\u1ea5u l\u00e0 \u201ckh\u00f4ng an to\u00e0n\u201d, \u0111i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng nghi\u00eam tr\u1ecdng \u0111\u1ebfn \u00fd \u0111\u1ecbnh truy c\u1eadp c\u1ee7a ng\u01b0\u1eddi d\u00f9ng v\u00e0 uy t\u00edn c\u1ee7a trang web \u0111\u00f3. H\u01a1n n\u1eefa, nhi\u1ec1u c\u00f4ng ngh\u1ec7 web hi\u1ec7n \u0111\u1ea1i nh\u01b0 Service Worker, API \u0111\u1ecbnh v\u1ecb \u0111\u1ecba l\u00fd, v.v. c\u0169ng y\u00eau c\u1ea7u trang web ph\u1ea3i ho\u1ea1t \u0111\u1ed9ng trong m\u00f4i tr\u01b0\u1eddng an to\u00e0n (t\u1ee9c l\u00e0 s\u1eed d\u1ee5ng HTTPS). \u0110\u1ed1i v\u1edbi vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm (SEO), HTTPS c\u0169ng l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 t\u00edch c\u1ef1c gi\u00fap n\u00e2ng cao th\u1ee9 h\u1ea1ng trang web tr\u00ean c\u00e1c b\u1ea3ng x\u1ebfp h\u1ea1ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Let\u2018s Encrypt\u7684\u514d\u8d39\u8bc1\u4e66\u548c\u4ed8\u8d39\u8bc1\u4e66\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Let\u2018s Encrypt\u63d0\u4f9b\u7684\u514d\u8d39DV\u8bc1\u4e66\u4e0e\u5546\u4e1aCA\u7684\u4ed8\u8d39DV\u8bc1\u4e66\u5728\u6280\u672f\u4e0a\u63d0\u4f9b\u7684\u52a0\u5bc6\u5f3a\u5ea6\u6ca1\u6709\u533a\u522b\u3002\u4e3b\u8981\u533a\u522b\u5728\u4e8e\u670d\u52a1\u652f\u6301\u3001\u4fdd\u9669\u548c\u7075\u6d3b\u6027\u4e0a\u3002\u4ed8\u8d39\u8bc1\u4e66\u901a\u5e38\u63d0\u4f9b\u6280\u672f\u652f\u6301\u3001\u4ef7\u503c\u4e0d\u7b49\u7684\u8d23\u4efb\u4fdd\u9669\u3001\u66f4\u7075\u6d3b\u7684\u8bc1\u4e66\u6709\u6548\u671f\u7ba1\u7406\uff08\u5982\u91cd\u7b7e\u653f\u7b56\uff09\uff0c\u4ee5\u53ca\u8d2d\u4e70OV\/EV\u7b49\u9700\u8981\u4eba\u5de5\u9a8c\u8bc1\u7684\u8bc1\u4e66\u7c7b\u578b\u3002Let\u2019s Encrypt\u7684\u8bc1\u4e66\u81ea\u52a8\u5316\u7a0b\u5ea6\u9ad8\uff0c\u975e\u5e38\u9002\u5408\u4e2a\u4eba\u3001\u5c0f\u578b\u9879\u76ee\u548c\u6d4b\u8bd5\u73af\u5883\uff0c\u800c\u5546\u4e1a\u8bc1\u4e66\u5219\u66f4\u591a\u7528\u4e8e\u9700\u8981\u670d\u52a1\u4fdd\u969c\u548c\u7279\u5b9a\u9a8c\u8bc1\u7c7b\u578b\u7684\u4f01\u4e1a\u73af\u5883\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Vi\u1ec7c tri\u1ec3n khai ch\u1ee9ng ch\u1ec9 SSL c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 truy c\u1eadp trang web kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c tri\u1ec3n khai ch\u1ee9ng ch\u1ec9 SSL v\u00e0 th\u1ef1c hi\u1ec7n giao ti\u1ebfp \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a th\u1ef1c s\u1ef1 s\u1ebd g\u00e2y ra m\u1ed9t l\u01b0\u1ee3ng chi ph\u00ed t\u00ednh to\u00e1n nh\u1ecf, ch\u1ee7 y\u1ebfu xu\u1ea5t ph\u00e1t t\u1eeb c\u00e1c thao t\u00e1c m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 b\u1ea5t \u0111\u1ed1i x\u1ee9ng trong giai \u0111o\u1ea1n k\u1ebft n\u1ed1i (TLS handshake). Tuy nhi\u00ean, nh\u1edd s\u1ef1 c\u1ea3i thi\u1ec7n v\u1ec1 hi\u1ec7u n\u0103ng ph\u1ea7n c\u1ee9ng v\u00e0 c\u00e1c c\u1eadp nh\u1eadt trong giao th\u1ee9c TLS (ch\u1eb3ng h\u1ea1n nh\u01b0 TLS 1.3 gi\u00fap qu\u00e1 tr\u00ecnh k\u1ebft n\u1ed1i di\u1ec5n ra nhanh h\u01a1n), t\u00e1c \u0111\u1ed9ng n\u00e0y g\u1ea7n nh\u01b0 kh\u00f4ng \u0111\u00e1ng k\u1ec3 v\u00e0 ng\u01b0\u1eddi d\u00f9ng h\u1ea7u nh\u01b0 kh\u00f4ng c\u1ea3m nh\u1eadn \u0111\u01b0\u1ee3c. Ng\u01b0\u1ee3c l\u1ea1i, v\u00ec giao th\u1ee9c HTTP\/2 ch\u1ec9 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 th\u00f4ng qua HTTPS tr\u00ean c\u00e1c tr\u00ecnh duy\u1ec7t hi\u1ec7n \u0111\u1ea1i, v\u00e0 c\u00e1c t\u00ednh n\u0103ng nh\u01b0 \u0111a lu\u1ed3ng (multiplexing) c\u1ee7a HTTP\/2 c\u00f3 th\u1ec3 gi\u00fap t\u0103ng \u0111\u00e1ng k\u1ec3 t\u1ed1c \u0111\u1ed9 t\u1ea3i trang web, vi\u1ec7c tri\u1ec3n khai ch\u1ee9ng ch\u1ec9 SSL th\u1eadm ch\u00ed c\u00f3 th\u1ec3 mang l\u1ea1i s\u1ef1 c\u1ea3i thi\u1ec7n v\u1ec1 hi\u1ec7u n\u0103ng t\u1ed5ng th\u1ec3.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sau khi ch\u1ee9ng ch\u1ec9 h\u1ebft h\u1ea1n, c\u00f3 c\u1ea7n s\u1eed d\u1ee5ng CSR (Certificate Signing Request) m\u1edbi khi gia h\u1ea1n kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb r\u1eb1ng khi gia h\u1ea1n, b\u1ea1n n\u00ean t\u1ea1o m\u1ed9t CSR (Certificate Signing Request) m\u1edbi c\u00f9ng v\u1edbi m\u1ed9t kh\u00f3a ri\u00eang (private key) m\u1edbi. \u0110\u00e2y l\u00e0 m\u1ed9t th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t v\u1ec1 m\u1eb7t b\u1ea3o m\u1eadt. Vi\u1ec7c s\u1eed d\u1ee5ng c\u1eb7p kh\u00f3a m\u1edbi s\u1ebd gi\u00fap gi\u1ea3m thi\u1ec3u nguy c\u01a1 t\u1eeb nh\u1eefng r\u00f2 r\u1ec9 c\u00f3 th\u1ec3 x\u1ea3y ra v\u1edbi kh\u00f3a ri\u00eang c\u0169, \u0111\u1ed3ng th\u1eddi \u0111\u1ea3m b\u1ea3o b\u1ea1n \u0111ang s\u1eed d\u1ee5ng c\u00e1c ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a m\u1edbi v\u00e0 an to\u00e0n h\u01a1n (v\u00ed d\u1ee5: n\u00e2ng c\u1ea5p t\u1eeb ph\u01b0\u01a1ng th\u1ee9c k\u00fd hi\u1ec7u SHA-1 c\u0169 l\u00ean SHA-2). M\u1eb7c d\u00f9 m\u1ed9t s\u1ed1 t\u1ed5 ch\u1ee9c c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authorities) h\u1ed7 tr\u1ee3 vi\u1ec7c t\u00e1i ph\u00e1t ch\u1ee9ng ch\u1ec9 s\u1eed d\u1ee5ng CSR c\u0169, nh\u01b0ng \u0111i\u1ec1u n\u00e0y ch\u1ec9 mang t\u00ednh t\u1ea1m th\u1eddi. X\u00e9t v\u1ec1 m\u1eb7t b\u1ea3o m\u1eadt l\u00e2u d\u00e0i, vi\u1ec7c thay \u0111\u1ed5i kh\u00f3a \u0111\u1ecbnh k\u1ef3 l\u00e0 c\u00e1ch l\u00e0m c\u00f3 tr\u00e1ch nhi\u1ec7m h\u01a1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 tri\u1ec3n khai c\u00f9ng m\u1ed9t ch\u1ee9ng ch\u1ec9 tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 ho\u1eb7c h\u1ec7 th\u1ed1ng CDN?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Trong tr\u01b0\u1eddng h\u1ee3p b\u1ea1n c\u1ea7n s\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t ch\u1ee9ng ch\u1ec9 tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 (ch\u1eb3ng h\u1ea1n nh\u01b0 m\u1ed9t c\u1ee5m b\u1ed9 ph\u00e2n ph\u1ed1i t\u1ea3i) ho\u1eb7c d\u1ecbch v\u1ee5 CDN, b\u1ea1n c\u1ea7n sao ch\u00e9p an to\u00e0n t\u1ec7p ch\u1ee9ng ch\u1ec9 SSL (bao g\u1ed3m chu\u1ed7i ch\u1ee9ng ch\u1ec9) \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o ra ban \u0111\u1ea7u (k\u00e8m theo kh\u00f3a ri\u00eang) l\u00ean m\u1ed7i m\u00e1y ch\u1ee7 c\u1ea7n \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh. Trong qu\u00e1 tr\u00ecnh n\u00e0y, b\u1ea1n ph\u1ea3i \u0111\u1ea3m b\u1ea3o an to\u00e0n khi truy\u1ec1n t\u1ea3i v\u00e0 l\u01b0u tr\u1eef kh\u00f3a ri\u00eang; vi\u1ec7c s\u1eed d\u1ee5ng k\u00eanh truy\u1ec1n d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a l\u00e0 r\u1ea5t \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb. Nhi\u1ec1u nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 \u0111\u00e1m m\u00e2y v\u00e0 n\u1ec1n t\u1ea3ng CDN c\u0169ng cung c\u1ea5p c\u00e1c giao di\u1ec7n qu\u1ea3n l\u00fd ch\u1ee9ng ch\u1ec9 ti\u1ec7n l\u1ee3i, cho ph\u00e9p b\u1ea1n t\u1ea3i l\u00ean ho\u1eb7c ch\u00e8n tr\u1ef1c ti\u1ebfp n\u1ed9i dung ch\u1ee9ng ch\u1ec9 v\u00e0 kh\u00f3a ri\u00eang \u0111\u1ec3 th\u1ef1c hi\u1ec7n vi\u1ec7c c\u1ea5u h\u00ecnh v\u00e0 qu\u1ea3n l\u00fd ch\u00fang m\u1ed9t c\u00e1ch th\u1ed1ng nh\u1ea5t.<\/p>","protected":false},"excerpt":{"rendered":"<p>SSL ch\u1ee9ng ch\u1ec9 l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t trong vi\u1ec7c b\u1ea3o v\u1ec7 an ninh cho trang web v\u00e0 x\u00e2y d\u1ef1ng l\u00f2ng tin c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. N\u00f3 s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng ngh\u1ec7 m\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng v\u00e0 ch\u1eef k\u00fd s\u1ed1 \u0111\u1ec3 th\u1ef1c hi\u1ec7n vi\u1ec7c m\u00e3 h\u00f3a d\u1eef li\u1ec7u v\u00e0 x\u00e1c th\u1ef1c danh t\u00ednh. B\u00e0i vi\u1ebft ph\u00e2n t\u00edch chi ti\u1ebft c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a SSL, quy tr\u00ecnh k\u1ebft n\u1ed1i HTTPS, \u0111\u1ed3ng th\u1eddi so s\u00e1nh c\u00e1c lo\u1ea1i ch\u1ee9ng ch\u1ec9 ch\u00ednh nh\u01b0 ch\u1ee9ng ch\u1ec9 x\u00e1c th\u1ef1c t\u00ean mi\u1ec1n (Domain Name Validation \u2013 DV), ch\u1ee9ng ch\u1ec9 x\u00e1c th\u1ef1c t\u1ed5 ch\u1ee9c (Organization Validation \u2013 OV), v\u00e0 ch\u1ee9ng ch\u1ec9 x\u00e1c th\u1ef1c m\u1edf r\u1ed9ng (Extended Validation \u2013 EV), c\u00f9ng v\u1edbi c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ph\u00f9 h\u1ee3p c\u1ee7a ch\u00fang, nh\u1eb1m cung c\u1ea5p h\u01b0\u1edbng d\u1eabn r\u00f5 r\u00e0ng cho vi\u1ec7c tri\u1ec3n khai c\u00e1c bi\u1ec7n ph\u00e1p b<\/p>","protected":false},"author":7,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[326,11,319],"knowledge_category":[277],"class_list":["post-12379446","knowledge_post","type-knowledge_post","status-publish","hentry","tag-https-guide","tag-ssl-certificate","tag-website-security","knowledge_category-ssl-certificate"],"acf":{"site_seo_keywords":"SSL\u8bc1\u4e66,HTTPS\u52a0\u5bc6,\u8bc1\u4e66\u7c7b\u578b,\u7f51\u7ad9\u5b89\u5168,\u90e8\u7f72\u6307\u5357,SSL\u8bc1\u4e66\u539f\u7406,OV\u8bc1\u4e66\u4e0eEV\u8bc1\u4e66\u533a\u522b"},"_links":{"self":[{"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/knowledge_posts\/12379446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/knowledge_posts"}],"about":[{"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/types\/knowledge_post"}],"author":[{"embeddable":true,"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/users\/7"}],"version-history":[{"count":0,"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/knowledge_posts\/12379446\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/media?parent=12379446"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/tags?post=12379446"},{"taxonomy":"knowledge_category","embeddable":true,"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/knowledge_category?post=12379446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}