{"id":12366130,"date":"2026-03-13T17:27:56","date_gmt":"2026-03-13T09:27:56","guid":{"rendered":"https:\/\/www.likacloud.com\/knowledge\/ssl%e8%af%81%e4%b9%a6%e7%bb%88%e6%9e%81%e6%8c%87%e5%8d%97%ef%bc%9a%e4%bb%8e%e5%85%a5%e9%97%a8%e5%88%b0%e7%b2%be%e9%80%9a%ef%bc%8c%e5%bc%80%e5%90%af%e7%bd%91%e7%ab%99https%e4%b9%8b%e6%97%85\/"},"modified":"2026-03-13T19:07:41","modified_gmt":"2026-03-13T11:07:41","slug":"ssl-certificate-guide-from-beginner-to-expert-https-website-security","status":"publish","type":"knowledge_post","link":"https:\/\/www.likacloud.com\/vi\/knowledge\/ssl-certificate\/ssl-certificate-guide-from-beginner-to-expert-https-website-security\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 ch\u1ee9ng ch\u1ec9 SSL: T\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao, b\u1eaft \u0111\u1ea7u h\u00e0nh tr\u00ecnh HTTPS cho website"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Trong m\u00f4i tr\u01b0\u1eddng internet ng\u00e0y nay, b\u1ea3o m\u1eadt trang web l\u00e0 n\u1ec1n t\u1ea3ng c\u01a1 b\u1ea3n cho s\u1ef1 tin t\u01b0\u1edfng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. Ch\u1ee9ng ch\u1ec9 SSL (Secure Sockets Layer) l\u00e0 c\u00f4ng ngh\u1ec7 then ch\u1ed1t gi\u00fap \u0111\u1ea3m b\u1ea3o an ninh n\u00e0y; n\u00f3 thi\u1ebft l\u1eadp m\u1ed9t k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a gi\u1eefa m\u00e1y kh\u00e1ch (ch\u1eb3ng h\u1ea1n nh\u01b0 tr\u00ecnh duy\u1ec7t) v\u00e0 m\u00e1y ch\u1ee7, nh\u1eb1m \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n t\u1ea3i \u0111\u1ec1u \u0111\u01b0\u1ee3c b\u1ea3o m\u1eadt v\u00e0 kh\u00f4ng b\u1ecb s\u1eeda \u0111\u1ed5i. Khi b\u1ea1n truy c\u1eadp m\u1ed9t trang web s\u1eed d\u1ee5ng ch\u1ee9ng ch\u1ec9 SSL, thanh \u0111\u1ecba ch\u1ec9 s\u1ebd hi\u1ec3n th\u1ecb ti\u1ec1n t\u1ed1 \u201chttps:\/\/\u201d c\u00f9ng v\u1edbi bi\u1ec3u t\u01b0\u1ee3ng kh\u00f3a, \u0111i\u1ec1u n\u00e0y cho th\u1ea5y k\u1ebft n\u1ed1i l\u00e0 an to\u00e0n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c trang web kh\u00f4ng s\u1eed d\u1ee5ng ch\u1ee9ng ch\u1ec9 SSL s\u1ebd s\u1eed d\u1ee5ng giao th\u1ee9c \u201chttp:\/\/\u201d, v\u00e0 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i d\u01b0\u1edbi d\u1ea1ng kh\u00f4ng \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a (d\u1ea1ng r\u00f5 r\u00e0ng), khi\u1ebfn ch\u00fang r\u1ea5t d\u1ec5 b\u1ecb c\u00e1c b\u00ean th\u1ee9 ba ch\u1eb7n \u0111o\u1ea1n v\u00e0 nghe l\u00e9n. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7t ra m\u1ed9t m\u1ed1i nguy hi\u1ec3m l\u1edbn \u0111\u1ed1i v\u1edbi nh\u1eefng trang web y\u00eau c\u1ea7u ng\u01b0\u1eddi d\u00f9ng \u0111\u0103ng nh\u1eadp, th\u1ef1c hi\u1ec7n giao d\u1ecbch thanh to\u00e1n ho\u1eb7c cung c\u1ea5p th\u00f4ng tin c\u00e1 nh\u00e2n. Do \u0111\u00f3, d\u00f9 l\u00e0 blog c\u00e1 nh\u00e2n, trang web c\u1ee7a doanh nghi\u1ec7p hay n\u1ec1n t\u1ea3ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, vi\u1ec7c tri\u1ec3n khai ch\u1ee9ng ch\u1ec9 SSL \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t thao t\u00e1c c\u01a1 b\u1ea3n v\u00e0 c\u1ea7n thi\u1ebft.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ed1t l\u00f5i c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL l\u00e0 kh\u1edfi \u0111\u1ed9ng giao th\u1ee9c HTTPS, v\u00e0 \u0111i\u1ec1u n\u00e0y d\u1ef1a tr\u00ean m\u1ed9t b\u1ed9 c\u01a1 ch\u1ebf m\u00e3 h\u00f3a v\u00e0 x\u00e1c th\u1ef1c r\u1ea5t ph\u1ee9c t\u1ea1p.<\/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\">Qu\u00e1 tr\u00ecnh giao ti\u1ebfp SSL\/TLS k\u1ebft h\u1ee3p m\u1ed9t c\u00e1ch kh\u00e9o l\u00e9o hai ph\u01b0\u01a1ng th\u1ee9c m\u00e3 h\u00f3a kh\u00e1c nhau. \u0110\u1ea7u ti\u00ean, m\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng (nh\u01b0 RSA, ECC) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 trao \u0111\u1ed5i m\u1ed9t \u201ckh\u00f3a phi\u00ean\u201d m\u1ed9t c\u00e1ch an to\u00e0n. M\u00e1y ch\u1ee7 gi\u1eef kh\u00f3a ri\u00eang, trong khi kh\u00f3a c\u00f4ng t\u01b0\u01a1ng \u1ee9ng \u0111\u01b0\u1ee3c ch\u1ee9a trong ch\u1ee9ng ch\u1ec9 SSL v\u00e0 \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn tr\u00ecnh duy\u1ec7t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ecnh duy\u1ec7t s\u1eed d\u1ee5ng kh\u00f3a c\u00f4ng khai n\u00e0y \u0111\u1ec3 m\u00e3 h\u00f3a m\u1ed9t \u201ckh\u00f3a ch\u1ee7 tr\u01b0\u1edbc\u201d \u0111\u01b0\u1ee3c t\u1ea1o ng\u1eabu nhi\u00ean v\u00e0 g\u1eedi n\u00f3 \u0111\u1ebfn m\u00e1y ch\u1ee7; ch\u1ec9 m\u00e1y ch\u1ee7 s\u1edf h\u1eefu kh\u00f3a ri\u00eang m\u1edbi c\u00f3 th\u1ec3 gi\u1ea3i m\u00e3 kh\u00f3a \u0111\u00f3. Sau \u0111\u00f3, c\u1ea3 hai b\u00ean c\u00f9ng t\u00ednh to\u00e1n ra \u201ckh\u00f3a phi\u00ean\u201d gi\u1ed1ng nhau d\u1ef1a tr\u00ean \u201ckh\u00f3a ch\u1ee7 tr\u01b0\u1edbc\u201d n\u00e0y. T\u1eeb th\u1eddi \u0111i\u1ec3m \u0111\u00f3, vi\u1ec7c trao \u0111\u1ed5i th\u00f4ng tin \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng ph\u01b0\u01a1ng th\u1ee9c m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng (ch\u1eb3ng h\u1ea1n nh\u01b0 AES), v\u00ec ph\u01b0\u01a1ng th\u1ee9c n\u00e0y hi\u1ec7u qu\u1ea3 h\u01a1n khi x\u1eed l\u00fd l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn.<\/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\">S\u1ed1 ch\u1ee9ng ch\u1ec9 v\u00e0 chu\u1ed7i tin c\u1eady c\u1ee7a CA (Certificate Authority)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SSL ch\u1ee9ng ch\u1ec9 th\u1ef1c ch\u1ea5t l\u00e0 m\u1ed9t t\u1ec7p tin s\u1ed1, ch\u1ee9a kh\u00f3a c\u00f4ng c\u1ed9ng c\u1ee7a trang web, th\u00f4ng tin v\u1ec1 ch\u1ee7 s\u1edf h\u1eefu trang web, c\u00f9ng v\u1edbi ch\u1eef k\u00fd s\u1ed1 c\u1ee7a c\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authority) \u0111\u00e3 ph\u00e1t h\u00e0nh ch\u1ee9ng ch\u1ec9 \u0111\u00f3. C\u00e1c tr\u00ecnh duy\u1ec7t \u0111\u1ec1u \u0111\u01b0\u1ee3c trang b\u1ecb s\u1eb5n m\u1ed9t danh s\u00e1ch c\u00e1c c\u01a1 quan c\u1ea5p ch\u1ee9ng ch\u1ec9 g\u1ed1c (root CA) \u0111\u01b0\u1ee3c tin c\u1eady.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi tr\u00ecnh duy\u1ec7t nh\u1eadn \u0111\u01b0\u1ee3c ch\u1ee9ng ch\u1ec9 t\u1eeb m\u00e1y ch\u1ee7, n\u00f3 s\u1ebd ki\u1ec3m tra xem ch\u1eef k\u00fd c\u1ee7a ch\u1ee9ng ch\u1ec9 c\u00f3 ph\u1ea3i \u0111\u1ebfn t\u1eeb t\u1ed5 ch\u1ee9c c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authority) n\u1eb1m trong danh s\u00e1ch c\u00e1c t\u1ed5 ch\u1ee9c \u0111\u01b0\u1ee3c tin c\u1eady hay kh\u00f4ng, \u0111\u1ed3ng th\u1eddi x\u00e1c minh xem ch\u1ee9ng ch\u1ec9 c\u00f2n h\u1ee3p l\u1ec7 trong th\u1eddi gian s\u1eed d\u1ee5ng hay kh\u00f4ng, v\u00e0 li\u1ec7u ch\u1ee9ng ch\u1ec9 \u0111\u00f3 c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi t\u00ean mi\u1ec1n \u0111ang \u0111\u01b0\u1ee3c truy c\u1eadp hay kh\u00f4ng. H\u1ec7 th\u1ed1ng x\u00e1c th\u1ef1c n\u00e0y t\u1ea1o n\u00ean \u201cchu\u1ed7i tin c\u1eady\u201d (trust chain), gi\u00fap \u0111\u1ea3m b\u1ea3o r\u1eb1ng ng\u01b0\u1eddi d\u00f9ng \u0111ang k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t trang web h\u1ee3p ph\u00e1p, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 trang web l\u1eeba \u0111<\/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 s\u1ed1 l\u01b0\u1ee3ng t\u00ean mi\u1ec1n \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7, ch\u1ee9ng ch\u1ec9 SSL \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c lo\u1ea1i ch\u00ednh sau \u0111\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u c\u1ee7a c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00e1c nhau.<\/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\">DV (Domain Validation) ch\u1ee9ng ch\u1ec9 l\u00e0 lo\u1ea1i ch\u1ee9ng ch\u1ec9 \u0111\u01b0\u1ee3c c\u1ea5p v\u1edbi t\u1ed1c \u0111\u1ed9 nhanh nh\u1ea5t v\u00e0 chi ph\u00ed th\u1ea5p nh\u1ea5t. Trung t\u00e2m ch\u1ee9ng nh\u1eadn (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 (v\u00ed d\u1ee5: b\u1eb1ng c\u00e1ch g\u1eedi email x\u00e1c th\u1ef1c \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 email \u0111\u00e3 \u0111\u0103ng k\u00fd cho t\u00ean mi\u1ec1n ho\u1eb7c thi\u1ebft l\u1eadp c\u00e1c b\u1ea3n ghi DNS c\u1ee5 th\u1ec3). DV ch\u1ee9ng ch\u1ec9 cung c\u1ea5p c\u00e1c ch\u1ee9c n\u0103ng m\u00e3 h\u00f3a c\u01a1 b\u1ea3n, 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. Tr\u00ecnh duy\u1ec7t s\u1ebd hi\u1ec3n th\u1ecb bi\u1ec3u t\u01b0\u1ee3ng kh\u00f3a v\u00e0 giao th\u1ee9c HTTPS khi trang web s\u1eed d\u1ee5ng DV ch\u1ee9ng ch\u1ec9.<\/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\">OV ch\u1ee9ng ch\u1ec9, d\u1ef1a tr\u00ean quy tr\u00ecnh x\u00e1c th\u1ef1c DV (Domain Validation), c\u00f2n b\u1ed5 sung th\u00eam c\u00e1c b\u01b0\u1edbc ki\u1ec3m tra nghi\u00eam ng\u1eb7t nh\u1eb1m x\u00e1c minh t\u00ednh x\u00e1c th\u1ef1c c\u1ee7a t\u1ed5 ch\u1ee9c n\u1ed9p \u0111\u01a1n. 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 ch\u00ednh th\u1ee9c c\u1ee7a doanh nghi\u1ec7p (ch\u1eb3ng h\u1ea1n nh\u01b0 gi\u1ea5y ph\u00e9p kinh doanh). Th\u00f4ng tin chi ti\u1ebft v\u1ec1 ch\u1ee9ng ch\u1ec9 s\u1ebd bao g\u1ed3m t\u00ean doanh nghi\u1ec7p \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c minh, \u0111i\u1ec1u n\u00e0y gi\u00fap t\u0103ng c\u01b0\u1eddng l\u00f2ng tin c\u1ee7a ng\u01b0\u1eddi d\u00f9ng doanh nghi\u1ec7p. OV ch\u1ee9ng ch\u1ec9 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho trang web ch\u00ednh th\u1ee9c c\u1ee7a c\u00e1c doanh nghi\u1ec7p v\u00e0<\/p>\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\">EV (Extended Validation) ch\u1ee9ng ch\u1ec9 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 c\u00e1c quy tr\u00ecnh x\u00e1c th\u1ef1c t\u1ed5 ch\u1ee9c, c\u00e1c t\u1ed5 ch\u1ee9c c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA \u2013 Certificate Authorities) c\u00f2n ti\u1ebfn h\u00e0nh c\u00e1c cu\u1ed9c \u0111i\u1ec1u tra n\u1ec1n t\u1ea3ng s\u00e2u r\u1ed9ng h\u01a1n. \u0110i\u1ec3m n\u1ed5i b\u1eadt nh\u1ea5t c\u1ee7a EV ch\u1ee9ng ch\u1ec9 l\u00e0 tr\u00ean m\u1ed9t s\u1ed1 tr\u00ecnh duy\u1ec7t, t\u00ean c\u00f4ng ty \u0111\u01b0\u1ee3c c\u1ea5p ch\u1ee9ng ch\u1ec9 s\u1ebd \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u1ef1c ti\u1ebfp b\u1eb1ng m\u00e0u xanh l\u00e1 c\u00e2y trong thanh \u0111\u1ecba ch\u1ec9 c\u1ee7a trang web, mang l\u1ea1i cho ng\u01b0\u1eddi d\u00f9ng c\u00e1ch x\u00e1c nh\u1eadn danh t\u00ednh tr\u1ef1c quan nh\u1ea5t. C\u00e1c trang web trong l\u0129nh v\u1ef1c t\u00e0i ch\u00ednh, thanh to\u00e1n, v\u00e0 th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed l\u1edbn th\u01b0\u1eddng s\u1eed<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ch\u1ee9ng ch\u1ec9 \u0111a t\u00ean mi\u1ec1n v\u00e0 ch\u1ee9ng ch\u1ec9 k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i m\u1ee9c \u0111\u1ed9 x\u00e1c th\u1ef1c (validation level) ra, ng\u01b0\u1eddi d\u00f9ng c\u00f2n c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn d\u1ef1a tr\u00ean ph\u1ea1m vi b\u1ea3o v\u1ec7 (coverage). Ch\u1ee9ng ch\u1ec9 cho m\u1ed9t t\u00ean mi\u1ec1n duy nh\u1ea5t (single-domain certificate) ch\u1ec9 b\u1ea3o v\u1ec7 m\u1ed9t t\u00ean mi\u1ec1n c\u1ee5 th\u1ec3. <code data-no-auto-translation=\"\">www.example.com<\/code>Ch\u1ee9ng ch\u1ec9 \u0111a t\u00ean mi\u1ec1n cho ph\u00e9p b\u1ea1n th\u00eam nhi\u1ec1u t\u00ean mi\u1ec1n ho\u00e0n to\u00e0n kh\u00e1c nhau v\u00e0o c\u00f9ng m\u1ed9t ch\u1ee9ng ch\u1ec9. Trong khi \u0111\u00f3, ch\u1ee9ng ch\u1ec9 ch\u1ee9a k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n (wildcard) 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 c\u1ee7a n\u00f3. <code data-no-auto-translation=\"\">*.example.com<\/code> bao ph\u1ee7 <code data-no-auto-translation=\"\">blog.example.com<\/code>, <code data-no-auto-translation=\"\">shop.example.com<\/code>\u0110\u00e2y l\u00e0 m\u1ed9t gi\u1ea3i ph\u00e1p c\u1ef1c k\u1ef3 linh ho\u1ea1t v\u00e0 hi\u1ec7u qu\u1ea3 \u0111\u1ed1i v\u1edbi c\u00e1c t\u1ed5 ch\u1ee9c s\u1edf h\u1eefu nhi\u1ec1u trang web con (sub-sites).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e1ch th\u1ee9c \u0111\u0103ng k\u00fd v\u00e0 c\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9 SSL<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Qu\u00e1 tr\u00ecnh tri\u1ec3n khai ch\u1ee9ng ch\u1ec9 SSL th\u01b0\u1eddng bao g\u1ed3m m\u1ed9t s\u1ed1 b\u01b0\u1edbc nh\u01b0: n\u1ed9p \u0111\u01a1n xin c\u1ea5p, x\u00e1c th\u1ef1c, t\u1ea3i xu\u1ed1ng v\u00e0 c\u00e0i \u0111\u1eb7t.<\/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\">Quy tr\u00ecnh \u0111\u0103ng k\u00fd ch\u1ee9ng ch\u1ec9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc ti\u00ean, b\u1ea1n c\u1ea7n t\u1ea1o m\u1ed9t t\u1ec7p CSR (Certificate Signing Request) tr\u00ean m\u00e1y ch\u1ee7 ho\u1eb7c n\u1ec1n t\u1ea3ng l\u01b0u tr\u1eef c\u1ee7a m\u00ecnh. T\u1ec7p CSR ch\u1ee9a kh\u00f3a c\u00f4ng khai c\u1ee7a b\u1ea1n c\u00f9ng v\u1edbi th\u00f4ng tin v\u1ec1 t\u1ed5 ch\u1ee9c m\u00e0 b\u1ea1n s\u1ebd n\u1ed9p \u0111\u01a1n xin ch\u1ee9ng ch\u1ec9 t\u1eeb CA (Certificate Authority). Sau \u0111\u00f3, h\u00e3y n\u1ed9p t\u1ec7p CSR \u0111\u00f3 cho CA m\u00e0 b\u1ea1n \u0111\u00e3 ch\u1ecdn ho\u1eb7c \u0111\u1ea1i l\u00fd c\u1ee7a h\u1ecd \u0111\u1ec3 y\u00eau c\u1ea7u c\u1ea5p ch\u1ee9ng ch\u1ec9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00f9y theo lo\u1ea1i ch\u1ee9ng ch\u1ec9 \u0111\u01b0\u1ee3c ch\u1ecdn, h\u00e3y th\u1ef1c hi\u1ec7n quy tr\u00ecnh x\u00e1c th\u1ef1c t\u01b0\u01a1ng \u1ee9ng. \u0110\u1ed1i v\u1edbi ch\u1ee9ng ch\u1ec9 DV, qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c th\u01b0\u1eddng m\u1ea5t t\u1eeb v\u00e0i ph\u00fat \u0111\u1ebfn v\u00e0i gi\u1edd; trong khi \u0111\u00f3, ch\u1ee9ng ch\u1ec9 OV\/EV c\u00f3 th\u1ec3 m\u1ea5t v\u00e0i ng\u00e0y. Sau khi x\u00e1c th\u1ef1c th\u00e0nh c\u00f4ng, b\u1ea1n s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c t\u1ec7p ch\u1ee9ng ch\u1ec9 SSL t\u1eeb t\u1ed5 ch\u1ee9c c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA) \u2013 t\u1ec7p n\u00e0y th\u01b0\u1eddng bao g\u1ed3m\u2026<code data-no-auto-translation=\"\">.crt<\/code>\u6216<code data-no-auto-translation=\"\">.cer<\/code>C\u00e1c t\u1ec7p tin, c\u00f9ng v\u1edbi chu\u1ed7i ch\u1ee9ng ch\u1ec9 trung gian (n\u1ebfu c\u00f3).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">C\u00e0i \u0111\u1eb7t v\u00e0 c\u1ea5u h\u00ecnh m\u00e1y ch\u1ee7<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c b\u01b0\u1edbc c\u00e0i \u0111\u1eb7t c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o ph\u1ea7n m\u1ec1m m\u00e1y ch\u1ee7 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. \u0110\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 Apache ph\u1ed5 bi\u1ebfn, b\u1ea1n c\u1ea7n c\u1ea5u h\u00ecnh t\u1ec7p m\u00e1y ch\u1ee7 \u1ea3o (virtual host file), v\u00e0 ch\u1ec9 \u0111\u1ecbnh \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ebfn t\u1ec7p ch\u1ee9ng ch\u1ec9, t\u1ec7p kh\u00f3a ri\u00eang (private key) v\u00e0 chu\u1ed7i ch\u1ee9ng ch\u1ec9 (certificate chain). \u0110\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 Nginx, b\u1ea1n c\u0169ng c\u1ea7n ch\u1ec9 \u0111\u1ecbnh v\u1ecb tr\u00ed c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL v\u00e0 kh\u00f3a trong ph\u1ea7n c\u1ea5u h\u00ecnh li\u00ean quan \u0111\u1ebfn m\u00e1y ch\u1ee7 (server block).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sau khi qu\u00e1 tr\u00ecnh c\u00e0i \u0111\u1eb7t ho\u00e0n t\u1ea5t, h\u00e3y \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 l\u01b0u l\u01b0\u1ee3ng HTTP \u0111\u1ec1u \u0111\u01b0\u1ee3c chuy\u1ec3n h\u01b0\u1edbng sang HTTPS m\u1ed9t c\u00e1ch t\u1ef1 \u0111\u1ed9ng. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n th\u00f4ng qua c\u00e1c quy t\u1eafc chuy\u1ec3n h\u01b0\u1edbng 301 trong c\u1ea5u h\u00ecnh m\u00e1y ch\u1ee7. Cu\u1ed1i c\u00f9ng, h\u00e3y s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 ki\u1ec3m tra SSL tr\u1ef1c tuy\u1ebfn \u0111\u1ec3 x\u00e1c minh xem ch\u1ee9ng ch\u1ec9 \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t \u0111\u00fang c\u00e1ch ch\u01b0a, li\u1ec7u n\u00f3 c\u00f3 \u0111\u00e1ng tin c\u1eady hay kh\u00f4ng, v\u00e0 li\u1ec7u c\u00e1c b\u1ed9 m\u00e3 h\u00f3a an to\u00e0n \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh \u0111\u00fang hay ch\u01b0a.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi ch\u1ee9ng ch\u1ec9 v\u00e0 th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t<\/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 duy nh\u1ea5t; qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi 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.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">T\u00ednh n\u0103ng gia h\u1ea1n \u0111\u1ecbnh k\u1ef3 v\u00e0 t\u1ef1 \u0111\u1ed9ng h\u00f3a<\/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\u1ee5 th\u1ec3. Tr\u01b0\u1edbc \u0111\u00e2y, th\u1eddi h\u1ea1n c\u1ee7a c\u00e1c ch\u1ee9ng ch\u1ec9 c\u00f3 th\u1ec3 l\u00ean \u0111\u1ebfn v\u00e0i n\u0103m, nh\u01b0ng nh\u1eb1m n\u00e2ng cao t\u00ednh linh ho\u1ea1t v\u00e0 an to\u00e0n m\u1ea1ng, c\u00e1c ti\u00eau chu\u1ea9n ng\u00e0nh \u0111\u00e3 chuy\u1ec3n sang quy \u0111\u1ecbnh th\u1eddi h\u1ea1n ng\u1eafn h\u01a1n (th\u01b0\u1eddng l\u00e0 m\u1ed9t n\u0103m ho\u1eb7c \u00edt h\u01a1n). B\u1ea1n c\u1ea7n \u0111\u1ea3m b\u1ea3o gia h\u1ea1n ch\u1ee9ng ch\u1ec9 k\u1ecbp th\u1eddi tr\u01b0\u1edbc khi n\u00f3 h\u1ebft h\u1ea1n; n\u1ebfu kh\u00f4ng, trang web c\u1ee7a b\u1ea1n s\u1ebd hi\u1ec3n th\u1ecb c\u1ea3nh b\u00e1o b\u1ea3o m\u1eadt v\u00e0 ng\u01b0\u1eddi d\u00f9ng s\u1ebd kh\u00f4ng th\u1ec3 truy c\u1eadp v\u00e0o trang web \u0111\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f3a\u70c8\u63a8\u8350\u4f7f\u7528\u81ea\u52a8\u5316\u5de5\u5177\u7ba1\u7406\u8bc1\u4e66\u7eed\u8ba2\u3002Let\u2018s Encrypt\u7b49\u514d\u8d39CA\u63d0\u4f9b\u4e86\u5b8c\u5168\u81ea\u52a8\u5316\u7684ACME\u534f\u8bae\uff0c\u53ef\u4ee5\u81ea\u52a8\u5b8c\u6210\u9a8c\u8bc1\u3001\u7b7e\u53d1\u548c\u90e8\u7f72\uff0c\u6781\u5927\u964d\u4f4e\u4e86\u7ba1\u7406\u8d1f\u62c5\u548c\u4eba\u4e3a\u9057\u5fd8\u7684\u98ce\u9669\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">K\u00edch ho\u1ea1t HTTP\/2 v\u00e0 c\u1ea5u h\u00ecnh b\u1ea3o m\u1eadt n\u00e2ng cao<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i vi\u1ec7c c\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9, c\u00f2n c\u1ea7n th\u1ef1c hi\u1ec7n th\u00eam c\u00e1c c\u1ea5u h\u00ecnh b\u1ea3o m\u1eadt kh\u00e1c. H\u00e3y \u0111\u1ea3m b\u1ea3o v\u00f4 hi\u1ec7u h\u00f3a c\u00e1c giao th\u1ee9c c\u0169 v\u00e0 kh\u00f4ng an to\u00e0n (nh\u01b0 SSLv2, SSLv3) c\u0169ng nh\u01b0 c\u00e1c b\u1ed9 m\u00e3 h\u00f3a y\u1ebfu. Vi\u1ec7c k\u00edch ho\u1ea1t giao th\u1ee9c HTTP\/2 c\u00f3 th\u1ec3 gi\u00fap c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 hi\u1ec7u n\u0103ng c\u1ee7a c\u00e1c trang web s\u1eed d\u1ee5ng HTTPS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed3ng th\u1eddi, h\u00e3y xem x\u00e9t vi\u1ec7c tri\u1ec3n khai ch\u00ednh s\u00e1ch HSTS (HTTP Strict Security Transport). B\u1eb1ng c\u00e1ch th\u00eam th\u00f4ng tin v\u00e0o ti\u00eau \u0111\u1ec1 ph\u1ea3n h\u1ed3i (response header), b\u1ea1n c\u00f3 th\u1ec3 y\u00eau c\u1ea7u tr\u00ecnh duy\u1ec7t ch\u1ec9 truy c\u1eadp trang web th\u00f4ng qua giao th\u1ee9c HTTPS trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh, t\u1eeb \u0111\u00f3 gi\u00fap b\u1ea3o v\u1ec7 trang web kh\u1ecfi c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng nh\u1eb1m l\u1ea5y c\u1eafp th\u00f4ng tin SSL (SSL stripping attacks). Vi\u1ec7c n\u1ed9p trang web c\u1ee7a b\u1ea1n v\u00e0o danh s\u00e1ch c\u00e1c trang web \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi ch\u00ednh s\u00e1ch HSTS s\u1eb5n c\u00f3 trong c\u00e1c tr\u00ecnh duy\u1ec7t l\u00e0 bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7<\/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 kh\u00f4ng gian internet an to\u00e0n v\u00e0 \u0111\u00e1ng tin c\u1eady. T\u1eeb lo\u1ea1i ch\u1ee9ng ch\u1ec9 DV c\u01a1 b\u1ea3n nh\u1ea5t \u0111\u1ebfn lo\u1ea1i ch\u1ee9ng ch\u1ec9 EV mang m\u1ee9c \u0111\u1ed9 tin c\u1eady cao nh\u1ea5t, ch\u00fang cung c\u1ea5p c\u00e1c gi\u1ea3i ph\u00e1p m\u00e3 h\u00f3a v\u00e0 x\u00e1c th\u1ef1c ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u c\u1ee7a c\u00e1c trang web \u1edf m\u1ecdi quy m\u00f4. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ch\u00fang, l\u1ef1a ch\u1ecdn lo\u1ea1i ch\u1ee9ng ch\u1ec9 ph\u00f9 h\u1ee3p, th\u1ef1c hi\u1ec7n qu\u00e1 tr\u00ecnh c\u00e0i \u0111\u1eb7t m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c v\u00e0 qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi ch\u00fang m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 l\u00e0 nh\u1eefng k\u1ef9 n\u0103ng thi\u1ebft y\u1ebfu \u0111\u1ed1i v\u1edbi m\u1ecdi ch\u1ee7 s\u1edf h\u1eefu trang web, nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 nh\u00e2n vi\u00ean v\u1eadn h\u00e0nh h\u1ec7 th\u1ed1ng. Vi\u1ec7c \u00e1p d\u1ee5ng giao th\u1ee9c HTTPS kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt m\u00e0 c\u00f2n l\u00e0 m\u1ed9t kho\u1ea3n \u0111\u1ea7u t\u01b0 t\u00edch c\u1ef1c cho tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng v\u00e0 th\u1ee9 h\u1ea1ng tr\u00ean c\u00e1c c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm; \u0111\u00e2y c\u0169ng l\u00e0 l\u1ef1a ch\u1ecdn kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ec3 c\u00e1c trang web c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i v\u00e0 ph\u00e1t tri\u1ec3n trong th\u1eddi \u0111\u1ea1i k\u1ef9 thu\u1eadt s\u1ed1.<\/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 c\u00f3 ch\u1ee9c n\u0103ng giao d\u1ecbch; li\u1ec7u v\u1eabn c\u1ea7n ch\u1ee9ng ch\u1ec9 SSL kh\u00f4ng?<\/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. C\u00e1c tr\u00ecnh duy\u1ec7t hi\u1ec7n \u0111\u1ea1i th\u01b0\u1eddng coi t\u1ea5t c\u1ea3 c\u00e1c trang web s\u1eed d\u1ee5ng giao th\u1ee9c HTTP l\u00e0 \u201ckh\u00f4ng an to\u00e0n\u201d, \u0111i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng nghi\u00eam tr\u1ecdng \u0111\u1ebfn s\u1ef1 tin t\u01b0\u1edfng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng khi truy c\u1eadp v\u00e0 \u0111\u1ebfn h\u00ecnh \u1ea3nh chuy\u00ean nghi\u1ec7p c\u1ee7a trang web \u0111\u00f3. Ngo\u00e0i ra, c\u00e1c c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm nh\u01b0 Google c\u0169ng xem vi\u1ec7c s\u1eed d\u1ee5ng giao th\u1ee9c HTTPS l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 t\u00edch c\u1ef1c trong vi\u1ec7c x\u1ebfp h\u1ea1ng k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm. Ngay c\u1ea3 \u0111\u1ed1i v\u1edbi nh\u1eefng trang web ch\u1ec9 hi\u1ec3n th\u1ecb n\u1ed9i dung t\u0129nh, vi\u1ec7c s\u1eed d\u1ee5ng ch\u1ee9ng ch\u1ec9 SSL c\u0169ng gi\u00fap b\u1ea3o v\u1ec7 quy\u1ec1n ri\u00eang t\u01b0 c\u1ee7a ng\u01b0\u1eddi d\u00f9ng v\u00e0 ng\u0103n<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Li\u1ec7u HTTPS c\u00f3 l\u00e0m ch\u1eadm t\u1ed1c \u0111\u1ed9 truy c\u1eadp v\u00e0o trang web kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Qu\u00e1 tr\u00ecnh k\u1ebft n\u1ed1i SSL (Handshake) trong giai \u0111o\u1ea1n \u0111\u1ea7u c\u00f3 th\u1ec3 g\u00e2y ra m\u1ed9t ch\u00fat tr\u00ec ho\u00e3n, nh\u01b0ng giao th\u1ee9c TLS hi\u1ec7n \u0111\u1ea1i c\u00f9ng v\u1edbi s\u1ef1 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 v\u1ec1 hi\u1ec7u n\u0103ng ph\u1ea7n c\u1ee9ng \u0111\u00e3 gi\u00fap gi\u1ea3m \u0111\u00e1ng k\u1ec3 t\u00ecnh tr\u1ea1ng n\u00e0y. B\u1eb1ng c\u00e1ch k\u00edch ho\u1ea1t giao th\u1ee9c HTTP\/2 v\u00e0 t\u1ed1i \u01b0u h\u00f3a c\u00e1c b\u1ed9 c\u00f4ng c\u1ee5 m\u00e3 h\u00f3a, hi\u1ec7u n\u0103ng c\u1ee7a c\u00e1c trang web s\u1eed d\u1ee5ng HTTPS ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 s\u00e1nh ngang v\u1edbi HTTP, th\u1eadm ch\u00ed c\u00f2n nhanh h\u01a1n. S\u1ef1 t\u0103ng nh\u1ecf v\u1ec1 hi\u1ec7u n\u0103ng so v\u1edbi l\u1ee3i \u00edch l\u1edbn v\u1ec1 m\u1eb7t b\u1ea3o m\u1eadt v\u00e0 s\u1ef1 tin t\u01b0\u1edfng m\u00e0 HTTPS mang l\u1ea1i l\u00e0 ho\u00e0n to\u00e0n x\u1ee9ng \u0111\u00e1ng.<\/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\">\u514d\u8d39\u8bc1\u4e66\uff08\u5982Let\u2018s Encrypt\u7b7e\u53d1\u7684\u5927\u591a\u4e3aDV\u8bc1\u4e66\uff09\u5728\u52a0\u5bc6\u5f3a\u5ea6\u4e0a\u4e0e\u4ed8\u8d39\u8bc1\u4e66\u5e76\u65e0\u533a\u522b\u3002\u4e3b\u8981\u533a\u522b\u5728\u4e8e\uff1a\u514d\u8d39\u8bc1\u4e66\u6709\u6548\u671f\u77ed\uff08\u901a\u5e3890\u5929\uff09\uff0c\u9700\u9891\u7e41\u81ea\u52a8\u7eed\u8ba2\uff1b\u4e00\u822c\u53ea\u63d0\u4f9b\u57df\u540d\u9a8c\u8bc1\uff1b\u4e0d\u63d0\u4f9b\u8d44\u91d1\u8d54\u507f\u4fdd\u969c\u3002\u4ed8\u8d39\u8bc1\u4e66\u5219\u63d0\u4f9bOV\/EV\u7ea7\u9a8c\u8bc1\u3001\u66f4\u957f\u7684\u53ef\u9009\u6709\u6548\u671f\u3001\u6280\u672f\u652f\u6301\u4ee5\u53ca\u56e0\u8bc1\u4e66\u95ee\u9898\u5bfc\u81f4\u635f\u5931\u7684\u7ecf\u6d4e\u8d54\u507f\u62c5\u4fdd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sau khi c\u00e0i \u0111\u1eb7t ch\u1ee9ng ch\u1ec9 SSL, t\u1ea1i sao 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 th\u01b0\u1eddng x\u1ea3y ra do \u201cn\u1ed9i dung h\u1ed7n h\u1ee3p\u201d (mixed content). M\u1eb7c d\u00f9 trang ch\u1ee7 \u0111\u01b0\u1ee3c t\u1ea3i th\u00f4ng qua giao th\u1ee9c HTTPS, nh\u01b0ng m\u1ed9t s\u1ed1 t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c nh\u00fang v\u00e0o trang (ch\u1eb3ng h\u1ea1n nh\u01b0 h\u00ecnh \u1ea3nh, JavaScript, t\u1ec7p CSS) v\u1eabn \u0111\u01b0\u1ee3c t\u1ea3i qua c\u00e1c li\u00ean k\u1ebft HTTP kh\u00f4ng an to\u00e0n. \u0110i\u1ec1u n\u00e0y khi\u1ebfn tr\u00ecnh duy\u1ec7t coi trang l\u00e0 kh\u00f4ng an to\u00e0n. C\u00e1ch gi\u1ea3i quy\u1ebft l\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c t\u00e0i nguy\u00ean tr\u00ean trang \u0111\u1ec1u s\u1eed d\u1ee5ng li\u00ean k\u1ebft HTTPS. B\u1ea1n c\u00f3 th\u1ec3 xem c\u1ee5 th\u1ec3 c\u00e1c c\u1ea3nh b\u00e1o v\u1ec1 n\u1ed9i dung h\u1ed7n h\u1ee3p th\u00f4ng qua console trong c\u00f4ng c\u1ee5 ph\u00e1t tri\u1ec3n (developer tools).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">M\u1ed9t ch\u1ee9ng ch\u1ec9 SSL c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho nhi\u1ec1u m\u00e1y ch\u1ee7 ho\u1eb7c t\u00ean mi\u1ec1n kh\u00e1c nhau kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o lo\u1ea1i ch\u1ee9ng ch\u1ec9. Ch\u1ee9ng ch\u1ec9 cho m\u1ed9t t\u00ean mi\u1ec1n duy nh\u1ea5t th\u01b0\u1eddng ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho m\u1ed9t t\u00ean mi\u1ec1n c\u1ee5 th\u1ec3. Ch\u1ee9ng ch\u1ec9 cho nhi\u1ec1u t\u00ean mi\u1ec1n cho ph\u00e9p b\u1ea1n th\u00eam nhi\u1ec1u t\u00ean mi\u1ec1n kh\u00e1c nhau v\u00e0o c\u00f9ng m\u1ed9t ch\u1ee9ng ch\u1ec9 khi mua n\u00f3. Ch\u1ee9ng ch\u1ec9 ch\u1ee9a k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n (wildcard) c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 m\u1ed9t t\u00ean mi\u1ec1n c\u00f9ng t\u1ea5t c\u1ea3 c\u00e1c t\u00ean mi\u1ec1n con c\u1ea5p d\u01b0\u1edbi c\u1ee7a n\u00f3. N\u1ebfu b\u1ea1n c\u1ea7n tri\u1ec3n khai c\u00f9ng m\u1ed9t d\u1ecbch v\u1ee5 tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 \u0111\u1ec3 th\u1ef1c hi\u1ec7n ph\u00e2n b\u1ed5 t\u1ea3i (load balancing), nhi\u1ec1u t\u1ed5 ch\u1ee9c c\u1ea5p ch\u1ee9ng ch\u1ec9 (CA) cho ph\u00e9p b\u1ea1n y\u00eau c\u1ea7u nhi\u1ec1u b\u1ea3n sao c\u1ee7a c\u00f9ng m\u1ed9t ch\u1ee9ng ch\u1ec9.<\/p>","protected":false},"excerpt":{"rendered":"<p>B\u00e0i vi\u1ebft n\u00e0y tr\u00ecnh b\u00e0y m\u1ed9t c\u00e1ch h\u1ec7 th\u1ed1ng v\u1ec1 vai tr\u00f2 v\u00e0 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u01a1 b\u1ea3n c\u1ee7a ch\u1ee9ng ch\u1ec9 SSL, bao g\u1ed3m quy tr\u00ecnh m\u00e3 h\u00f3a v\u00e0 chu\u1ed7i tin c\u1eady. B\u00e0i vi\u1ebft so s\u00e1nh chi ti\u1ebft c\u00e1c lo\u1ea1i ch\u1ee9ng ch\u1ec9 kh\u00e1c nhau nh\u01b0 DV, OV, EV v\u1ec1 c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ph\u00f9 h\u1ee3p, \u0111\u1ed3ng th\u1eddi cung c\u1ea5p h\u01b0\u1edbng d\u1eabn chi ti\u1ebft t\u1eeb vi\u1ec7c n\u1ed9p \u0111\u01a1n, x\u00e1c th\u1ef1c \u0111\u1ebfn vi\u1ec7c c\u00e0i \u0111\u1eb7t tr\u00ean m\u00e1y ch\u1ee7, nh\u1ea5n m\u1ea1nh t\u1ea7m quan tr\u1ecdng c\u1ee7a vi\u1ec7c qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi ch\u1ee9ng ch\u1ec9.<\/p>","protected":false},"author":7,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[],"knowledge_category":[277],"class_list":["post-12366130","knowledge_post","type-knowledge_post","status-publish","hentry","knowledge_category-ssl-certificate"],"acf":{"site_seo_keywords":"SSL\u8bc1\u4e66,HTTPS,\u7f51\u7ad9\u5b89\u5168,\u52a0\u5bc6,\u8bc1\u4e66\u7533\u8bf7,CA\u673a\u6784,\u901a\u914d\u7b26\u8bc1\u4e66,SSL\u8bc1\u4e66\u5b89\u88c5\u6307\u5357"},"_links":{"self":[{"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/knowledge_posts\/12366130","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\/12366130\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/media?parent=12366130"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/tags?post=12366130"},{"taxonomy":"knowledge_category","embeddable":true,"href":"https:\/\/www.likacloud.com\/vi\/wp-json\/wp\/v2\/knowledge_category?post=12366130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}