{"id":12362766,"date":"2026-03-12T13:40:44","date_gmt":"2026-03-12T05:40:44","guid":{"rendered":"https:\/\/www.likacloud.com\/knowledge\/ssl%e8%af%81%e4%b9%a6%e7%a9%b6%e7%ab%9f%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f%e4%bb%8e%e5%8e%9f%e7%90%86%e5%88%b0%e9%83%a8%e7%bd%b2%e7%9a%84%e5%ae%8c%e6%95%b4%e6%8c%87%e5%8d%97%e4%b8%8e%e5%ae%9e\/"},"modified":"2026-03-12T17:43:25","modified_gmt":"2026-03-12T09:43:25","slug":"ssl-certificate-guide-principles-deployment-best-practices","status":"publish","type":"knowledge_post","link":"https:\/\/www.likacloud.com\/vi\/knowledge\/ssl-certificate\/ssl-certificate-guide-principles-deployment-best-practices\/","title":{"rendered":"SSL (Secure Sockets Layer) ch\u00ednh l\u00e0 g\u00ec? H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n t\u1eeb nguy\u00ean l\u00fd \u0111\u1ebfn quy tr\u00ecnh tri\u1ec3n khai k\u00e8m theo c\u00e1c l\u1eddi khuy\u00ean th\u1ef1c t\u1ebf"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Trong k\u1ef7 nguy\u00ean Internet ng\u00e0y nay, b\u1ea3o m\u1eadt d\u1eef li\u1ec7u v\u00e0 quy\u1ec1n ri\u00eang t\u01b0 \u0111\u00e3 tr\u1edf th\u00e0nh nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u1ef1c k\u1ef3 quan tr\u1ecdng. Khi b\u1ea1n truy c\u1eadp m\u1ed9t trang web v\u00e0 th\u1ea5y bi\u1ec3u t\u01b0\u1ee3ng kh\u00f3a nh\u1ecf \u1edf thanh \u0111\u1ecba ch\u1ec9, ch\u00ednh ch\u1ee9ng ch\u1ec9 SSL \u2013 m\u1ed9t c\u00f4ng ngh\u1ec7 then ch\u1ed1t \u2013 \u0111ang b\u1ea3o v\u1ec7 an ninh th\u00f4ng tin trao \u0111\u1ed5i c\u1ee7a b\u1ea1n. Ch\u1ee9ng ch\u1ec9 SSL kh\u00f4ng ch\u1ec9 l\u00e0 \u201cch\u1ee9ng minh th\u01b0\u201d cho t\u00ednh tin c\u1eady c\u1ee7a trang web m\u00e0 c\u00f2n \u0111\u00f3ng vai tr\u00f2 nh\u01b0 \u201ck\u00eanh m\u00e3 h\u00f3a\u201d \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m kh\u00f4ng b\u1ecb \u0111\u00e1nh c\u1eafp ho\u1eb7c s\u1eeda \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh truy\u1ec1n t\u1ea3i, t\u1ea1o n\u00ean n\u1ec1n t\u1ea3ng cho c\u00e1c giao ti\u1ebfp m\u1ea1ng an to\u00e0n hi\u1ec7n \u0111\u1ea1i.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nguy\u00ean l\u00fd c\u01a1 b\u1ea3n c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL\/TLS<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nhi\u1ec7m v\u1ee5 c\u1ed1t l\u00f5i c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL l\u00e0 th\u1ef1c hi\u1ec7n hai ch\u1ee9c n\u0103ng: \u201cm\u00e3 h\u00f3a\u201d v\u00e0 \u201cx\u00e1c th\u1ef1c\u201d. Ch\u1ee9ng ch\u1ec9 n\u00e0y s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng C\u01a1 s\u1edf h\u1ea1 t\u1ea7ng kh\u00f3a c\u00f4ng (PKI \u2013 Public Key Infrastructure) \u0111\u1ec3 thi\u1ebft l\u1eadp m\u1ed9t k\u1ebft n\u1ed1i an to\u00e0n v\u00e0 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a gi\u1eefa m\u00e1y ch\u1ee7 v\u00e0 m\u00e1y kh\u00e1ch (ch\u1eb3ng h\u1ea1n nh\u01b0 tr\u00ecnh duy\u1ec7t).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Quy tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng c\u1ee7a giao th\u1ee9c SSL\/TLS<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Khi b\u1ea1n nh\u1eadp m\u1ed9t \u0111\u1ecba ch\u1ec9 web b\u1eaft \u0111\u1ea7u b\u1eb1ng \u201chttps\u201d v\u00e0o tr\u00ecnh duy\u1ec7t, qu\u00e1 tr\u00ecnh thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i an to\u00e0n (handshake) s\u1ebd \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ngay l\u1eadp t\u1ee9c. \u0110\u1ea7u ti\u00ean, tr\u00ecnh duy\u1ec7t c\u1ee7a b\u1ea1n s\u1ebd g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7 \u0111\u1ec3 thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i an to\u00e0n. Sau \u0111\u00f3, m\u00e1y ch\u1ee7 s\u1ebd g\u1eedi ch\u1ee9ng ch\u1ec9 SSL (bao g\u1ed3m kh\u00f3a c\u00f4ng khai) c\u1ee7a m\u00ecnh \u0111\u1ebfn tr\u00ecnh duy\u1ec7t. Tr\u00ecnh duy\u1ec7t s\u1ebd ki\u1ec3m tra xem nh\u00e0 cung c\u1ea5p ch\u1ee9ng ch\u1ec9 c\u00f3 \u0111\u00e1ng tin c\u1eady hay kh\u00f4ng, xem ch\u1ee9ng ch\u1ec9 c\u00f2n h\u1ee3p l\u1ec7 trong th\u1eddi h\u1ea1n hay kh\u00f4ng, v\u00e0 xem t\u00ean mi\u1ec1n trong ch\u1ee9ng ch\u1ec9 c\u00f3 tr\u00f9ng kh\u1edbp v\u1edbi t\u00ean mi\u1ec1n m\u00e0 b\u1ea1n \u0111ang truy c\u1eadp hay kh\u00f4ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sau khi qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c \u0111\u01b0\u1ee3c ho\u00e0n t\u1ea5t, tr\u00ecnh duy\u1ec7t s\u1ebd t\u1ea1o ra m\u1ed9t \u201ckh\u00f3a phi\u00ean\u201d ng\u1eabu nhi\u00ean, sau \u0111\u00f3 m\u00e3 h\u00f3a kh\u00f3a n\u00e0y b\u1eb1ng kh\u00f3a c\u00f4ng khai c\u1ee7a m\u00e1y ch\u1ee7 v\u00e0 g\u1eedi tr\u1edf l\u1ea1i m\u00e1y ch\u1ee7. M\u00e1y ch\u1ee7 s\u1ebd gi\u1ea3i m\u00e3 kh\u00f3a n\u00e0y b\u1eb1ng kh\u00f3a ri\u00eang c\u1ee7a m\u00ecnh \u0111\u1ec3 l\u1ea5y \u0111\u01b0\u1ee3c kh\u00f3a phi\u00ean th\u1ef1c t\u1ebf. Nh\u01b0 v\u1eady, c\u1ea3 hai b\u00ean \u0111\u1ec1u s\u1edf h\u1eefu m\u1ed9t kh\u00f3a chung m\u00e0 ch\u1ec9 h\u1ecd m\u1edbi bi\u1ebft \u0111\u1ebfn. T\u1ea5t c\u1ea3 n\u1ed9i dung truy\u1ec1n th\u00f4ng sau n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 b\u1eb1ng kh\u00f3a phi\u00ean \u0111\u1ed1i x\u1ee9ng n\u00e0y, nh\u1eb1m \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt v\u00e0 to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n t\u1ea3i.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a ch\u1ee9ng ch\u1ec9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t ch\u1ee9ng ch\u1ec9 SSL ti\u00eau chu\u1ea9n bao g\u1ed3m m\u1ed9t s\u1ed1 th\u00f4ng tin quan tr\u1ecdng: c\u1ea5p ph\u00e1t cho ai (t\u00ean mi\u1ec1n trang web ho\u1eb7c t\u00ean t\u1ed5 ch\u1ee9c), do ai c\u1ea5p (t\u1ed5 ch\u1ee9c c\u1ea5p ch\u1ee9ng ch\u1ec9 CA), chu\u1ed7i kh\u00f3a c\u00f4ng khai, ng\u00e0y b\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac hi\u1ec7u l\u1ef1c c\u1ee7a ch\u1ee9ng ch\u1ec9, c\u0169ng nh\u01b0 ch\u1eef k\u00fd s\u1ed1 do CA t\u1ea1o ra cho th\u00f4ng tin ch\u1ee9ng ch\u1ec9 n\u00e0y. Ch\u1eef k\u00fd n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng, v\u00ec n\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ee9ng ch\u1ec9 kh\u00f4ng th\u1ec3 b\u1ecb gi\u1ea3 m\u1ea1o sau khi \u0111\u01b0\u1ee3c c\u1ea5p ph\u00e1t.<\/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<h2 class=\"wp-block-heading\">C\u00e1c lo\u1ea1i ch\u00ednh c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL v\u00e0 c\u00e1ch l\u1ef1a ch\u1ecdn ch\u00fang<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc khi l\u1ef1a ch\u1ecdn m\u1ed9t ch\u1ee9ng ch\u1ec9 ph\u00f9 h\u1ee3p tr\u00ean th\u1ecb tr\u01b0\u1eddng, vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c lo\u1ea1i ch\u1ee9ng ch\u1ec9 kh\u00e1c nhau l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean quan tr\u1ecdng. C\u00e1c ch\u1ee9ng ch\u1ec9 th\u01b0\u1eddng \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 x\u00e1c th\u1ef1c v\u00e0 s\u1ed1 l\u01b0\u1ee3ng t\u00ean mi\u1ec1n m\u00e0 ch\u00fang b\u1ea3o v\u1ec7.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ph\u00e2n lo\u1ea1i theo c\u1ea5p \u0111\u1ed9 x\u00e1c th\u1ef1c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">1. Ch\u1ee9ng ch\u1ec9 ki\u1ec3m tra quy\u1ec1n s\u1edf h\u1eefu t\u00ean mi\u1ec1n: \u0110\u00e2y l\u00e0 lo\u1ea1i ch\u1ee9ng ch\u1ec9 c\u01a1 b\u1ea3n nh\u1ea5t. C\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authority) ch\u1ec9 ki\u1ec3m tra xem ng\u01b0\u1eddi n\u1ed9p \u0111\u01a1n c\u00f3 quy\u1ec1n ki\u1ec3m so\u00e1t t\u00ean mi\u1ec1n \u0111\u00f3 hay kh\u00f4ng (ch\u1eb3ng h\u1ea1n th\u00f4ng qua email ho\u1eb7c d\u1ecbch v\u1ee5 gi\u1ea3i quy\u1ebft DNS). Qu\u00e1 tr\u00ecnh c\u1ea5p ch\u1ee9ng ch\u1ec9 di\u1ec5n ra nhanh ch\u00f3ng v\u00e0 chi ph\u00ed th\u1ea5p, ph\u00f9 h\u1ee3p cho c\u00e1c trang web c\u00e1 nh\u00e2n, blog ho\u1eb7c m\u00f4i tr\u01b0\u1eddng th\u1eed nghi\u1ec7m, ch\u1ee7 y\u1ebfu cung c\u1ea5p ch\u1ee9c n\u0103ng m\u00e3 h\u00f3a c\u01a1 b\u1ea3n.<br \/>\n2. Ch\u1ee9ng ch\u1ec9 ki\u1ec3m tra t\u00ednh h\u1ee3p ph\u00e1p c\u1ee7a t\u1ed5 ch\u1ee9c (Organization Validation Certificates): D\u1ef1a tr\u00ean qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c DV (Domain Validation), t\u1ed5 ch\u1ee9c c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authority) s\u1ebd ki\u1ec3m tra xem t\u1ed5 ch\u1ee9c n\u1ed9p \u0111\u01a1n c\u00f3 th\u1ef1c s\u1ef1 t\u1ed3n t\u1ea1i hay kh\u00f4ng (ch\u1eb3ng h\u1ea1n th\u00f4ng qua gi\u1ea5y ph\u00e9p kinh doanh, v.v.). T\u00ean c\u1ee7a t\u1ed5 ch\u1ee9c s\u1ebd \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u00ean ch\u1ee9ng ch\u1ec9, \u0111i\u1ec1u n\u00e0y gi\u00fap t\u0103ng c\u01b0\u1eddng \u0111\u00e1ng k\u1ec3 s\u1ef1 tin t\u01b0\u1edfng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. Lo\u1ea1i ch\u1ee9ng ch\u1ec9 n\u00e0y ph\u00f9 h\u1ee3<br \/>\n3. Ch\u1ee9ng ch\u1ec9 x\u00e1c th\u1ef1c m\u1edf r\u1ed9ng (Extended Validation Certificates): \u0110\u00e2y 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 c\u1ea5p \u0111\u1ed9 b\u1ea3o m\u1eadt cao nh\u1ea5t. C\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authority) s\u1ebd ti\u1ebfn h\u00e0nh ki\u1ec3m tra to\u00e0n di\u1ec7n v\u1ec1 t\u1ed5 ch\u1ee9c \u0111\u00f3. \u0110i\u1ec3m n\u1ed5i b\u1eadt nh\u1ea5t c\u1ee7a lo\u1ea1i ch\u1ee9ng ch\u1ec9 n\u00e0y l\u00e0 khi truy c\u1eadp v\u00e0o c\u00e1c trang web s\u1eed d\u1ee5ng ch\u00fang, thanh \u0111\u1ecba ch\u1ec9 tr\u00ean c\u00e1c tr\u00ecnh duy\u1ec7t ph\u1ed5 bi\u1ebfn s\u1ebd hi\u1ec3n th\u1ecb t\u00ean c\u00f4ng ty b\u1eb1ng m\u00e0u xanh l\u00e1, cung c\u1ea5p cho ng\u01b0\u1eddi d\u00f9ng b\u1eb1ng ch\u1ee9ng x\u00e1c th\u1ef1c danh t\u00ednh \u1edf m\u1ee9c \u0111\u1ed9 cao nh\u1ea5t. Lo\u1ea1i ch\u1ee9ng ch\u1ec9 n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi c\u00e1c t\u1ed5 ch\u1ee9c t\u00e0i ch\u00ednh, c\u00e1c n\u1ec1n t\u1ea3ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ph\u00e2n lo\u1ea1i theo t\u00ean mi\u1ec1n bao ph\u1ee7<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">1. Ch\u1ee9ng ch\u1ec9 cho m\u1ed9t t\u00ean mi\u1ec1n duy nh\u1ea5t: Ch\u1ec9 b\u1ea3o v\u1ec7 m\u1ed9t t\u00ean mi\u1ec1n c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: www.example.com).<br \/>\n2. Ch\u1ee9ng ch\u1ec9 \u0111a t\u00ean mi\u1ec1n: M\u1ed9t ch\u1ee9ng ch\u1ec9 c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 nhi\u1ec1u t\u00ean mi\u1ec1n ho\u00e0n to\u00e0n kh\u00e1c nhau, gi\u00fap c\u00e1c doanh nghi\u1ec7p qu\u1ea3n l\u00fd nhi\u1ec1u trang web m\u1ed9t c\u00e1ch thu\u1eadn ti\u1ec7n.<br \/>\n3. Ch\u1ee9ng ch\u1ec9 ch\u1ee9a k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n (wildcard certificate): C\u00f3 th\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: Ch\u1ee9ng ch\u1ec9 *.example.com c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 blog.example.com, shop.example.com, v.v.). Khi c\u00f3 nhi\u1ec1u t\u00ean mi\u1ec1n con, ch\u1ee9ng ch\u1ec9 ch\u1ee9a k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n gi\u00fap gi\u1ea3m \u0111\u00e1ng k\u1ec3 c\u00f4ng vi\u1ec7c qu\u1ea3n l\u00fd v\u00e0 chi ph\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e1ch l\u1ea5y v\u00e0 tri\u1ec3n khai ch\u1ee9ng ch\u1ec9 SSL<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Quy tr\u00ecnh thu th\u1eadp v\u00e0 c\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9 SSL ng\u00e0y c\u00e0ng tr\u1edf n\u00ean ti\u00eau chu\u1ea9n h\u00f3a v\u00e0 thu\u1eadn ti\u1ec7n h\u01a1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Quy tr\u00ecnh nh\u1eadn ch\u1ee9ng ch\u1ec9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\uff0c\u60a8\u9700\u8981\u5728\u60a8\u7684\u670d\u52a1\u5668\u6216\u6258\u7ba1\u5e73\u53f0\u4e0a\u751f\u6210\u4e00\u4e2a\u201c\u8bc1\u4e66\u7b7e\u540d\u8bf7\u6c42\u201d\u6587\u4ef6\u3002\u8fd9\u4e2aCSR\u6587\u4ef6\u5305\u542b\u4e86\u60a8\u7684\u516c\u94a5\u548c\u7ec4\u7ec7\u4fe1\u606f\u3002\u7136\u540e\uff0c\u5411CA\uff08\u5982DigiCert\u3001Sectigo\uff0c\u6216\u514d\u8d39\u7684Let's Encrypt\uff09\u63d0\u4ea4CSR\u8fdb\u884c\u9a8c\u8bc1\u3002\u6839\u636e\u60a8\u7533\u8bf7\u7684\u8bc1\u4e66\u7c7b\u578b\uff0c\u5b8c\u6210\u76f8\u5e94\u7684\u57df\u540d\u6216\u7ec4\u7ec7\u9a8c\u8bc1\u3002\u9a8c\u8bc1\u901a\u8fc7\u540e\uff0cCA\u4f1a\u7b7e\u53d1\u8bc1\u4e66\u6587\u4ef6\uff08\u901a\u5e38\u5305\u542b.crt\u6216.pem\u6587\u4ef6\u4ee5\u53ca\u53ef\u80fd\u7684\u4e2d\u95f4\u8bc1\u4e66\u94fe\uff09\uff0c\u4f9b\u60a8\u4e0b\u8f7d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">C\u00e1c b\u01b0\u1edbc tri\u1ec3n khai m\u00e1y ch\u1ee7<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Qu\u00e1 tr\u00ecnh tri\u1ec3n khai ph\u1ee5 thu\u1ed9c v\u00e0o ph\u1ea7n m\u1ec1m m\u00e1y ch\u1ee7 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. L\u1ea5y Nginx l\u00e0m v\u00ed d\u1ee5, b\u1ea1n c\u1ea7n t\u1ea3i c\u00e1c t\u1ec7p ch\u1ee9ng ch\u1ec9 (ch\u1ee9ng ch\u1ec9 m\u00e1y ch\u1ee7 v\u00e0 ch\u1ee9ng ch\u1ec9 trung gian CA) c\u00f9ng v\u1edbi t\u1ec7p kh\u00f3a ri\u00eang \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o tr\u01b0\u1edbc \u0111\u00f3 l\u00ean th\u01b0 m\u1ee5c \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh tr\u00ean m\u00e1y ch\u1ee7. Sau \u0111\u00f3, h\u00e3y s\u1eeda \u0111\u1ed5i t\u1ec7p c\u1ea5u h\u00ecnh c\u1ee7a Nginx, ch\u1ec9 \u0111\u1ecbnh \u0111\u00fang \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ebfn c\u00e1c t\u1ec7p ch\u1ee9ng ch\u1ec9 v\u00e0 kh\u00f3a ri\u00eang trong ph\u1ea7n c\u1ea5u h\u00ecnh d\u00e0nh cho port 443. Cu\u1ed1i c\u00f9ng, h\u00e3y t\u1ea3i l\u1ea1i c\u1ea5u h\u00ecnh Nginx \u0111\u1ec3 c\u00e1c thay \u0111\u1ed5i c\u00f3 hi\u1ec7u l\u1ef1c. Sau khi tri\u1ec3n khai xong, h\u00e3y s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 tr\u1ef1c tuy\u1ebfn \u0111\u1ec3 ki\u1ec3m tra xem ch\u1ee9ng ch\u1ec9 \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t \u0111\u00fang c\u00e1ch ch\u01b0a, li\u1ec7u chu\u1ed7i ch\u1ee9ng ch\u1ec9 c\u00f3 ho\u00e0n ch\u1ec9nh hay kh\u00f4ng, v\u00e0 li\u1ec7u c\u00f3 b\u1ea5t k\u1ef3 l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt n\u00e0o kh\u00f4ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">T\u1ef1 \u0111\u1ed9ng h\u00f3a v\u00e0 ch\u1ee9ng ch\u1ec9 mi\u1ec5n ph\u00ed<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u5e0c\u671b\u7b80\u5316\u6d41\u7a0b\u7684\u7528\u6237\uff0c\u53ef\u4ee5\u5229\u7528\u81ea\u52a8\u5316\u5de5\u5177\u3002\u4f8b\u5982\uff0cLet's Encrypt\u63d0\u4f9b\u7684Certbot\u5ba2\u6237\u7aef\uff0c\u53ef\u4ee5\u81ea\u52a8\u5b8c\u6210\u4ece\u7533\u8bf7\u3001\u9a8c\u8bc1\u5230\u90e8\u7f72\u3001\u7eed\u671f\u7684\u5168\u8fc7\u7a0b\uff0c\u6781\u5927\u5730\u964d\u4f4e\u4e86\u4f7f\u7528HTTPS\u7684\u95e8\u69db\uff0c\u63a8\u52a8\u4e86\u5168\u7f51\u7684\u52a0\u5bc6\u5316\u8fdb\u7a0b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t trong qu\u1ea3n l\u00fd ch\u1ee9ng ch\u1ec9 SSL<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c tri\u1ec3n khai c\u00e1c ch\u1ee9ng ch\u1ec9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t l\u1ea7n l\u00e0m xong v\u00e0 m\u00e3i m\u00e3i; qu\u1ea3n l\u00fd ch\u00fang m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an ninh l\u00e2u d\u00e0i.<\/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\">Theo d\u00f5i k\u1ecbp th\u1eddi v\u00e0 gia h\u1ea1n (Timely monitoring and renewal)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ee9ng ch\u1ec9 SSL c\u00f3 th\u1eddi h\u1ea1n s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3 (hi\u1ec7n t\u1ea1i, th\u1eddi h\u1ea1n t\u1ed1i \u0111a l\u00e0 13 th\u00e1ng, theo quy \u0111\u1ecbnh c\u1ee7a c\u00e1c di\u1ec5n \u0111\u00e0n CA\/B). Khi ch\u1ee9ng ch\u1ec9 h\u1ebft h\u1ea1n, trang web s\u1ebd kh\u00f4ng th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c v\u00e0 c\u00e1c c\u1ea3nh b\u00e1o v\u1ec1 b\u1ea3o m\u1eadt s\u1ebd xu\u1ea5t hi\u1ec7n, g\u00e2y t\u1ed5n h\u1ea1i nghi\u00eam tr\u1ecdng \u0111\u1ebfn uy t\u00edn c\u1ee7a trang web \u0111\u00f3. Th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t l\u00e0 thi\u1ebft l\u1eadp h\u1ec7 th\u1ed1ng gi\u00e1m s\u00e1t v\u00e0 c\u1ea3nh b\u00e1o, b\u1eaft \u0111\u1ea7u quy tr\u00ecnh gia h\u1ea1n ch\u1ee9ng ch\u1ec9 \u00edt nh\u1ea5t 30 ng\u00e0y tr\u01b0\u1edbc khi n\u00f3 h\u1ebft h\u1ea1n. C\u00e1c c\u00f4ng c\u1ee5 t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n vi\u1ec7c gia h\u1ea1n t\u1ef1 \u0111\u1ed9ng, nh\u1eb1m lo\u1ea1i b\u1ecf ho\u00e0n to\u00e0n nguy c\u01a1 ch\u1ee9ng ch\u1ec9 h<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">S\u1eed d\u1ee5ng b\u1ed9 m\u00e3 h\u00f3a m\u1ea1nh v\u00e0 giao th\u1ee9c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ec9 c\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9 l\u00e0 ch\u01b0a \u0111\u1ee7; b\u1ea1n c\u1ea7n \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u00e1y ch\u1ee7 \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh s\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd v\u00e0 phi\u00ean b\u1ea3n giao th\u1ee9c an to\u00e0n. C\u00e1c giao th\u1ee9c SSL c\u0169, kh\u00f4ng an to\u00e0n (nh\u01b0 SSL 2.0\/3.0) n\u00ean b\u1ecb v\u00f4 hi\u1ec7u h\u00f3a, v\u00e0 b\u1ea1n n\u00ean \u01b0u ti\u00ean s\u1eed d\u1ee5ng TLS 1.2 ho\u1eb7c TLS 1.3. H\u00e3y c\u1ea5u h\u00ecnh c\u00e1c b\u1ed9 c\u00f4ng c\u1ee5 m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd \u0111\u1ec3 ch\u1ed1ng l\u1ea1i c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng t\u1eeb c\u00e1c l\u1ed7 h\u1ed5ng \u0111\u00e3 bi\u1ebft.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Th\u1ef1c hi\u1ec7n b\u1ea3o m\u1eadt truy\u1ec1n t\u1ea3i HTTP nghi\u00eam ng\u1eb7t (HTTP Strict Transport Security \u2013 HTTP SSTP)<\/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 ti\u00eau \u0111\u1ec1 ph\u1ea3n h\u1ed3i r\u1eb1ng trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh, t\u1ea5t c\u1ea3 c\u00e1c k\u1ebft n\u1ed1i \u0111\u1ebfn trang web \u0111\u00f3 ph\u1ea3i s\u1eed d\u1ee5ng giao th\u1ee9c HTTPS. \u0110i\u1ec1u n\u00e0y gi\u00fap ng\u0103n ch\u1eb7n hi\u1ec7u qu\u1ea3 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng nh\u1eb1m l\u00e0m gi\u1ea3m c\u1ea5p \u0111\u1ed9 b\u1ea3o m\u1eadt (downgrade attacks) v\u00e0 vi\u1ec7c chi\u1ebfm \u0111o\u1ea1t giao th\u1ee9c truy\u1ec1n th\u00f4ng (protocol hijacking), t\u1eeb \u0111\u00f3 n\u00e2ng cao \u0111\u1ed9 an to\u00e0n t\u1ed5ng th\u1ec3 cho trang web. B\u1ea1n c\u00f3 th\u1ec3 \u0111\u0103ng k\u00fd trang web c\u1ee7a m\u00ecnh v\u00e0o danh s\u00e1ch t\u1ea3i tr\u01b0\u1edbc (preload list) c\u1ee7a tr\u00ecnh duy\u1ec7t theo ch\u00ednh s\u00e1ch HSTS \u0111\u1ec3 t\u0103ng th<\/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\u01a1 b\u1ea3n \u0111\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t m\u00f4i tr\u01b0\u1eddng m\u1ea1ng tin c\u1eady v\u00e0 an to\u00e0n. Ch\u1ee9ng ch\u1ec9 n\u00e0y s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p ho\u00e0n h\u1ea3o gi\u1eefa c\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng v\u00e0 \u0111\u1ed1i x\u1ee9ng, nh\u1eb1m \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt, to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 t\u00ednh x\u00e1c th\u1ef1c c\u1ee7a danh t\u00ednh m\u00e1y ch\u1ee7. T\u1eeb vi\u1ec7c hi\u1ec3u r\u00f5 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a SSL, \u0111\u1ebfn vi\u1ec7c l\u1ef1a ch\u1ecdn lo\u1ea1i ch\u1ee9ng ch\u1ec9 ph\u00f9 h\u1ee3p theo nhu c\u1ea7u, cho \u0111\u1ebfn vi\u1ec7c tri\u1ec3n khai v\u00e0 qu\u1ea3n l\u00fd ch\u00fang m\u1ed9t c\u00e1ch \u0111\u00fang \u0111\u1eafn, m\u1ecdi b\u01b0\u1edbc \u0111\u1ec1u c\u1ef1c k\u1ef3 quan tr\u1ecdng. Trong b\u1ed1i c\u1ea3nh c\u00e1c ti\u00eau chu\u1ea9n b\u1ea3o m\u1eadt m\u1ea1ng ng\u00e0y c\u00e0ng nghi\u00eam ng\u1eb7t hi\u1ec7n nay, vi\u1ec7c tri\u1ec3n khai v\u00e0 qu\u1ea3n l\u00fd SSL ch\u1ee9ng ch\u1ec9 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 cho trang web \u0111\u00e3 kh\u00f4ng c\u00f2n ch\u1ec9 l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 \u201ct\u0103ng \u0111i\u1ec3m\u201d m\u00e0 \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t y\u00eau c\u1ea7u c\u01a1 b\u1ea3n v\u00e0 tr\u00e1ch nhi\u1ec7m kh\u00f4ng th\u1ec3 b\u1ecf qua.<\/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\">HTTPS v\u00e0 SSL c\u00f3 ph\u1ea3i l\u00e0 c\u00f9ng m\u1ed9t th\u1ee9 kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HTTPS l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a \u201cHTTP over SSL\/TLS\u201d. N\u00f3i m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c h\u01a1n, SSL\/TLS l\u00e0 c\u00e1c giao th\u1ee9c m\u00e3 h\u00f3a \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n gi\u1eefa l\u1edbp truy\u1ec1n t\u1ea3i (transport layer) v\u00e0 l\u1edbp \u1ee9ng d\u1ee5ng (application layer), trong khi HTTPS ch\u00ednh l\u00e0 giao th\u1ee9c HTTP \u0111\u01b0\u1ee3c truy\u1ec1n qua \u201c\u0111\u01b0\u1eddng h\u1ea7m b\u1ea3o m\u1eadt\u201d do SSL\/TLS t\u1ea1o ra. Khi ch\u00fang ta n\u00f3i r\u1eb1ng m\u1ed9t trang web \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t SSL, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 trang web h\u1ed7 tr\u1ee3 truy c\u1eadp th\u00f4ng qua giao th\u1ee9c HTTPS.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ch\u1ee9ng ch\u1ec9 SSL mi\u1ec5n ph\u00ed v\u00e0 tr\u1ea3 ph\u00ed kh\u00e1c nhau th\u1ebf n\u00e0o?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3b\u8981\u533a\u522b\u5728\u4e8e\u9a8c\u8bc1\u7ea7\u522b\u3001\u4fdd\u9669\u8d54\u4ed8\u3001\u6280\u672f\u652f\u6301\u548c\u670d\u52a1\u7b49\u7ea7\u534f\u8bae\u3002\u514d\u8d39\u8bc1\u4e66\uff08\u5982Let's Encrypt\uff09\u901a\u5e38\u53ea\u63d0\u4f9b\u57df\u540d\u9a8c\u8bc1\uff0c\u7b7e\u53d1\u81ea\u52a8\u5316\uff0c\u9002\u5408\u57fa\u7840\u52a0\u5bc6\u9700\u6c42\u3002\u4ed8\u8d39\u8bc1\u4e66\u5219\u63d0\u4f9b\u7ec4\u7ec7\u9a8c\u8bc1\u6216\u6269\u5c55\u9a8c\u8bc1\uff0c\u5305\u542b\u66f4\u9ad8\u7684\u8eab\u4efd\u62c5\u4fdd\u3001\u6d4f\u89c8\u5668\u5730\u5740\u680f\u7684\u663e\u8457\u6807\u8bc6\uff08\u5982\u7eff\u8272\u516c\u53f8\u540d\uff09\u3001\u4ee5\u53ca\u56e0\u8bc1\u4e66\u95ee\u9898\u5bfc\u81f4\u635f\u5931\u7684\u7ecf\u6d4e\u8d54\u507f\u4fdd\u969c\u548c\u6280\u672f\u652f\u6301\u670d\u52a1\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">T\u1ea1i sao trang web c\u1ee7a t\u00f4i \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9 SSL nh\u01b0ng tr\u00ecnh duy\u1ec7t v\u1eabn hi\u1ec3n th\u1ecb th\u00f4ng b\u00e1o \u201ckh\u00f4ng an to\u00e0n\u201d?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 x\u1ea3y ra do nhi\u1ec1u l\u00fd do kh\u00e1c nhau. Nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 trang web \u0111ang s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p c\u00e1c t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c t\u1ea3i qua giao th\u1ee9c HTTP (ch\u1eb3ng h\u1ea1n nh\u01b0 h\u00ecnh \u1ea3nh, script, b\u1ea3ng \u0111\u1ecbnh d\u1ea1ng). Tr\u00ecnh duy\u1ec7t s\u1ebd coi nh\u1eefng t\u00e0i nguy\u00ean n\u00e0y l\u00e0 kh\u00f4ng an to\u00e0n v\u00e0 hi\u1ec3n th\u1ecb c\u1ea3nh b\u00e1o t\u01b0\u01a1ng \u1ee9ng. B\u1ea1n c\u1ea7n \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c li\u00ean k\u1ebft \u0111\u1ebfn t\u00e0i nguy\u00ean tr\u00ean trang web \u0111\u1ec1u s\u1eed d\u1ee5ng giao th\u1ee9c HTTPS. C\u00e1c nguy\u00ean nh\u00e2n kh\u00e1c c\u00f3 th\u1ec3 bao g\u1ed3m: ch\u1ee9ng ch\u1ec9 \u0111\u00e3 h\u1ebft h\u1ea1n, ch\u1ee9ng ch\u1ec9 kh\u00f4ng kh\u1edbp v\u1edbi t\u00ean mi\u1ec1n, ho\u1eb7c thi\u1ebfu chu\u1ed7i ch\u1ee9ng ch\u1ec9 trung gian.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">C\u00e1c ch\u1ee9ng ch\u1ec9 s\u1eed d\u1ee5ng k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n (wildcard certificates) c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 nhi\u1ec1u t\u00ean mi\u1ec1n con \u1edf c\u00e1c c\u1ea5p \u0111\u1ed9 kh\u00e1c nhau kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ee9ng ch\u1ec9 m\u00e3 ho\u00e1 s\u1eed d\u1ee5ng k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n (wildcard) ti\u00eau chu\u1ea9n (ch\u1eb3ng h\u1ea1n nh\u01b0 *.example.com) ch\u1ec9 c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c t\u00ean mi\u1ec1n con c\u1ea5p m\u1ed9t, nh\u01b0 blog.example.com ho\u1eb7c shop.example.com. N\u00f3 kh\u00f4ng th\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c t\u00ean mi\u1ec1n con c\u1ea5p hai, ch\u1eb3ng h\u1ea1n nh\u01b0 dev.www.example.com. N\u1ebfu b\u1ea1n c\u1ea7n b\u1ea3o v\u1ec7 nhi\u1ec1u t\u00ean mi\u1ec1n con \u1edf c\u00e1c c\u1ea5p \u0111\u1ed9 kh\u00e1c nhau, b\u1ea1n th\u01b0\u1eddng ph\u1ea3i xin m\u1ed9t ch\u1ee9ng ch\u1ec9 \u0111a t\u00ean mi\u1ec1n (multi-domain certificate) bao g\u1ed3m t\u1ea5t c\u1ea3 c\u00e1c t\u00ean mi\u1ec1n con c\u1ea7n b\u1ea3o v\u1ec7, ho\u1eb7c ph\u1ea3i xin c\u00e1c ch\u1ee9ng ch\u1ec9 m\u00e3 ho\u00e1 s\u1eed d\u1ee5ng k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n ri\u00eang bi\u1ec7t cho t\u1eebng c\u1ea5p \u0111\u1ed9 \u0111\u00f3.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ch\u1ee9ng ch\u1ec9 SSL c\u00f3 c\u1ea7n ph\u1ea3i mua h\u00e0ng n\u0103m kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SSL ch\u1ee9ng ch\u1ec9 c\u00f3 th\u1eddi h\u1ea1n s\u1eed d\u1ee5ng c\u1ed1 \u0111\u1ecbnh, v\u00ec v\u1eady c\u1ea7n \u0111\u01b0\u1ee3c gia h\u1ea1n \u0111\u1ecbnh k\u1ef3 thay v\u00ec mua l\u1ea1i m\u1ed7i n\u0103m. B\u1ea1n c\u00f3 th\u1ec3 y\u00eau c\u1ea7u c\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authority) ban \u0111\u1ea7u ho\u1eb7c m\u1ed9t CA kh\u00e1c c\u1ea5p m\u1ed9t ch\u1ee9ng ch\u1ec9 m\u1edbi tr\u01b0\u1edbc khi ch\u1ee9ng ch\u1ec9 c\u0169 h\u1ebft h\u1ea1n. Xu h\u01b0\u1edbng hi\u1ec7n nay trong ng\u00e0nh l\u00e0 th\u1eddi h\u1ea1n s\u1eed d\u1ee5ng c\u1ee7a ch\u1ee9ng ch\u1ec9 ng\u00e0y c\u00e0ng \u0111\u01b0\u1ee3c r\u00fat ng\u1eafn nh\u1eb1m n\u00e2ng cao m\u1ee9c \u0111\u1ed9 b\u1ea3o m\u1eadt; do \u0111\u00f3, vi\u1ec7c t\u1ef1 \u0111\u1ed9ng h\u00f3a qu\u00e1 tr\u00ecnh gia h\u1ea1n v\u00e0 qu\u1ea3n l\u00fd ch\u1ee9ng ch\u1ec9 tr\u1edf n\u00ean c\u1ef1c k\u1ef3 quan tr\u1ecdng.<\/p>","protected":false},"excerpt":{"rendered":"<p>SSL ch\u1ee9ng ch\u1ec9 l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t \u0111\u1ec3 th\u1ef1c hi\u1ec7n vi\u1ec7c m\u00e3 h\u00f3a d\u1eef li\u1ec7u qua giao th\u1ee9c HTTPS v\u00e0 x\u00e1c th\u1ef1c danh t\u00ednh c\u1ee7a trang web. B\u00e0i vi\u1ebft n\u00e0y tr\u00ecnh b\u00e0y m\u1ed9t c\u00e1ch chi ti\u1ebft nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a SSL, quy tr\u00ecnh thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i (handshake), \u0111\u1ed3ng th\u1eddi so s\u00e1nh c\u00e1c lo\u1ea1i ch\u1ee9ng ch\u1ec9 kh\u00e1c nhau d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 x\u00e1c th\u1ef1c v\u00e0 ph\u1ea1m vi b\u1ea3o v\u1ec7 m\u00e0 ch\u00fang cung c\u1ea5p. Ngo\u00e0i ra, b\u00e0i vi\u1ebft c\u00f2n cung c\u1ea5p h\u01b0\u1edbng d\u1eabn th\u1ef1c h\u00e0nh to\u00e0n di\u1ec7n t\u1eeb vi\u1ec7c n\u1ed9p \u0111\u01a1n xin c\u1ea5p ch\u1ee9ng ch\u1ec9, tri\u1ec3n khai ch\u00fang tr\u00ean trang web, cho \u0111\u1ebfn vi\u1ec7c t\u1ef1 \u0111\u1ed9ng gia h\u1ea1n v\u00e0 c\u1ea5u h\u00ecnh c\u00e1c thi\u1ebft l\u1eadp b\u1ea3o m\u1eadt, nh<\/p>","protected":false},"author":7,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[],"knowledge_category":[277],"class_list":["post-12362766","knowledge_post","type-knowledge_post","status-publish","hentry","knowledge_category-ssl-certificate"],"acf":{"site_seo_keywords":"SSL\u8bc1\u4e66,TLS\u52a0\u5bc6,HTTPS\u90e8\u7f72,\u8bc1\u4e66\u7c7b\u578b,\u8bc1\u4e66\u7533\u8bf7,SSL\u8bc1\u4e66\u7ba1\u7406,SSL\u8bc1\u4e66\u6700\u4f73\u5b9e\u8df5,\u901a\u914d\u7b26\u8bc1\u4e66"},"_links":{"self":[{"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/knowledge_posts\/12362766","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\/12362766\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/media?parent=12362766"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/tags?post=12362766"},{"taxonomy":"knowledge_category","embeddable":true,"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/knowledge_category?post=12362766"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}