{"id":290316,"date":"2023-12-07T16:32:58","date_gmt":"2023-12-07T09:32:58","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=290316"},"modified":"2023-12-07T16:32:58","modified_gmt":"2023-12-07T09:32:58","slug":"aes","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/aes\/","title":{"rendered":"Ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a d\u1eef li\u1ec7u AES l\u00e0 g\u00ec v\u00e0 c\u00e1c ch\u1ebf \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a AES"},"content":{"rendered":"<p><strong>AES l\u00e0 m\u1ed9t thu\u1eadt to\u00e1n m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng v\u1edbi \u0111\u1eb7c t\u00ednh \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i. Ch\u00fang c\u00f3 nhi\u1ec1u \u01b0u \u0111i\u1ec3m v\u00e0 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong nhi\u1ec1u m\u1ea3ng kh\u00e1c nhau. H\u00e3y tham kh\u1ea3o b\u00e0i vi\u1ebft sau \u0111\u1ec3 hi\u1ec3u r\u00f5 v\u1ec1 kh\u00e1i ni\u1ec7m n\u00e0y c\u0169ng nh\u01b0 c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a ch\u00fang.<\/strong><\/p>\n<h2>Thu\u1eadt to\u00e1n AES l\u00e0 g\u00ec?<\/h2>\n<p>Trong l\u0129nh v\u1ef1c m\u1eadt m\u00e3 h\u1ecdc, Advanced Encryption Standard c\u00f2n \u0111\u01b0\u1ee3c vi\u1ebft t\u1eaft l\u00e0 AES. N\u00f3 l\u00e0 m\u1ed9t thu\u1eadt to\u00e1n m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng. \u0110i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 n\u00f3 d\u00f9ng m\u1ed9t kh\u00f3a duy nh\u1ea5t \u0111\u1ec3 c\u1ea3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 d\u1eef li\u1ec7u. AES ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u00e1c kh\u1ed1i d\u1eef li\u1ec7u 128 bit v\u00e0 cho ph\u00e9p s\u1eed d\u1ee5ng c\u00e1c kh\u00f3a c\u00f3 \u0111\u1ed9 d\u00e0i kh\u00e1c nhau (128, 192, ho\u1eb7c 256 bit) \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt.<\/p>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t thu\u1eadt to\u00e1n m\u00e3 h\u00f3a kh\u1ed1i \u0111\u01b0\u1ee3c ch\u00ednh ph\u1ee7 M\u1ef9 \u00e1p d\u1ee5ng nh\u01b0 l\u00e0 ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a. N\u00f3 \u0111\u00e3 tr\u1ea3i qua m\u1ed9t qu\u00e1 tr\u00ecnh nghi\u00ean c\u1ee9u k\u1ef9 l\u01b0\u1ee1ng. Vi\u1ec7n Ti\u00eau chu\u1ea9n v\u00e0 C\u00f4ng ngh\u1ec7 Qu\u1ed1c gia M\u1ef9 (National Institute of Standards and Technology \u2013 NIST) \u0111\u00e3 ch\u00ednh th\u1ee9c ch\u1ea5p thu\u1eadn AES l\u00e0m ti\u00eau chu\u1ea9n li\u00ean bang sau m\u1ed9t chu\u1ed7i qu\u00e1 tr\u00ecnh ti\u00eau chu\u1ea9n h\u00f3a k\u00e9o d\u00e0i trong 5 n\u0103m. N\u00f3 thay th\u1ebf cho chu\u1ea9n DES (Data Encryption Standard) c\u0169 \u0111\u1ec3 \u1ee9ng d\u1ee5ng to\u00e0n c\u1ea7u.<\/p>\n<figure id=\"attachment_292405\" aria-describedby=\"caption-attachment-292405\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-292405 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-1.jpg\" alt=\"aes-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292405\" class=\"wp-caption-text\">Advanced Encryption Standard l\u00e0 m\u1ed9t thu\u1eadt to\u00e1n m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng<\/figcaption><\/figure>\n<p>Thu\u1eadt to\u00e1n AES l\u00e0 m\u1ed9t lo\u1ea1i &#8220;m\u00e3 h\u00f3a kh\u1ed1i&#8221;. N\u00f3 \u0111\u01b0\u1ee3c s\u00e1ng t\u1ea1o ban \u0111\u1ea7u b\u1edfi hai chuy\u00ean gia m\u1eadt m\u00e3 ng\u01b0\u1eddi B\u1ec9 l\u00e0 Joan Daemen v\u00e0 Vincent Rijmen. K\u1ec3 t\u1eeb khi tr\u1edf th\u00e0nh ti\u00eau chu\u1ea9n, thu\u1eadt to\u00e1n n\u00e0y l\u00e0 m\u1ed9t trong nh\u1eefng thu\u1eadt to\u00e1n m\u00e3 h\u00f3a ph\u1ed5 bi\u1ebfn nh\u1ea5t. Thu\u1eadt to\u00e1n n\u00e0y s\u1eed d\u1ee5ng kh\u00f3a m\u00e3 \u0111\u1ed1i x\u1ee9ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3. T\u1ea1i Vi\u1ec7t Nam, thu\u1eadt to\u00e1n AES \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn v\u00e0 t\u00edch h\u1ee3p v\u00e0o ti\u00eau chu\u1ea9n qu\u1ed1c gia TCVN 7816:2007 v\u1ec1 Thu\u1eadt to\u00e1n m\u00e3 h\u00f3a d\u1eef li\u1ec7u t\u1eeb n\u0103m 2007.<\/p>\n<h2>\u1ee8ng d\u1ee5ng c\u1ee7a thu\u1eadt to\u00e1n AES<\/h2>\n<p>AES l\u00e0 m\u1ed9t thu\u1eadt to\u00e1n m\u00e3 h\u00f3a d\u1eef li\u1ec7u ti\u00ean ti\u1ebfn. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 c\u00e1ch s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn c\u1ee7a ch\u00fang.<\/p>\n<h3>AES b\u1ea3o m\u1eadt th\u00f4ng tin truy\u1ec1n qua m\u1ea1ng<\/h3>\n<p>Thu\u1eadt to\u00e1n M\u00e3 h\u00f3a Ti\u00ean ti\u1ebfn (AES) th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng. Ch\u00fang gi\u00fap \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n v\u00e0 b\u1ea3o m\u1eadt c\u1ee7a c\u00e1c lo\u1ea1i th\u00f4ng tin. Ch\u1eb3ng h\u1ea1n nh\u01b0 th\u00f4ng tin c\u00e1 nh\u00e2n, d\u1eef li\u1ec7u t\u00e0i kho\u1ea3n quan tr\u1ecdng, v\u00e0 c\u00e1c d\u1eef li\u1ec7u quan tr\u1ecdng kh\u00e1c trong qu\u00e1 tr\u00ecnh ch\u00fang \u0111\u01b0\u1ee3c truy\u1ec1n t\u1ea3i qua m\u1ea1ng.<\/p>\n<p>M\u1ed9t v\u00ed d\u1ee5 r\u00f5 r\u00e0ng l\u00e0 trong giao th\u1ee9c HTTPS. \u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng th\u1ee9c b\u1ea3o m\u1eadt ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 truy\u1ec1n t\u1ea3i d\u1eef li\u1ec7u an to\u00e0n qua Internet. Trong ng\u1eef c\u1ea3nh n\u00e0y, ch\u00fang \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 m\u1ed9t c\u00e1ch an to\u00e0n. Nh\u1edd \u0111\u00f3, n\u00f3 ng\u0103n ch\u1eb7n vi\u1ec7c truy c\u1eadp tr\u00e1i ph\u00e9p v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt to\u00e0n di\u1ec7n cho th\u00f4ng tin truy\u1ec1n t\u1ea3i. \u0110i\u1ec1u n\u00e0y gi\u00fap n\u00e2ng cao t\u00ednh an to\u00e0n c\u1ee7a th\u00f4ng tin c\u00e1 nh\u00e2n. H\u01a1n h\u1ebft n\u00f3 c\u00f2n \u0111\u00f3ng g\u00f3p v\u00e0o vi\u1ec7c x\u00e2y d\u1ef1ng m\u1ed9t m\u00f4i tr\u01b0\u1eddng tr\u1ef1c tuy\u1ebfn \u0111\u00e1ng tin c\u1eady v\u00e0 an to\u00e0n cho ng\u01b0\u1eddi s\u1eed d\u1ee5ng.<\/p>\n<figure id=\"attachment_292406\" aria-describedby=\"caption-attachment-292406\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-292406 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-2.jpg\" alt=\"aes-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292406\" class=\"wp-caption-text\">AES gi\u00fap \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n v\u00e0 b\u1ea3o m\u1eadt c\u1ee7a c\u00e1c lo\u1ea1i th\u00f4ng tin g\u1eedi qua m\u1ea1ng<\/figcaption><\/figure>\n<h3>AES b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u trong c\u00e1c \u1ee9ng d\u1ee5ng<\/h3>\n<p>C\u1ee5 th\u1ec3, c\u00e1c \u1ee9ng d\u1ee5ng ng\u00e2n h\u00e0ng tr\u1ef1c tuy\u1ebfn th\u01b0\u1eddng s\u1eed d\u1ee5ng AES. Ngo\u00e0i ra, c\u00e1c h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd t\u00e0i kho\u1ea3n c\u0169ng s\u1eed d\u1ee5ng thu\u1eadt to\u00e1n n\u00e0y. \u0110\u00e2y l\u00e0 n\u01a1i m\u00e0 vi\u1ec7c b\u1ea3o m\u1eadt th\u00f4ng tin c\u00e1 nh\u00e2n v\u00e0 t\u00e0i ch\u00ednh c\u1ee7a kh\u00e1ch h\u00e0ng l\u00e0 \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u. Thu\u1eadt to\u00e1n n\u00e0y gi\u00fap m\u00e3 h\u00f3a c\u00e1c giao d\u1ecbch v\u00e0 th\u00f4ng tin t\u00e0i kho\u1ea3n. Vi\u1ec7c m\u00e3 h\u00f3a \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u00fang kh\u00f4ng b\u1ecb ti\u1ebft l\u1ed9 cho nh\u1eefng ng\u01b0\u1eddi kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p truy c\u1eadp. Vi\u1ec7c n\u00e0y gi\u00fap b\u1ea3o v\u1ec7 th\u00f4ng tin nh\u1ea1y c\u1ea3m kh\u1ecfi hacker. Ch\u1ec9 nh\u1eefng ng\u01b0\u1eddi c\u00f3 quy\u1ec1n h\u1ea1n th\u00edch h\u1ee3p m\u1edbi c\u00f3 th\u1ec3 truy c\u1eadp v\u00e0o d\u1eef li\u1ec7u.<\/p>\n<p>T\u00f3m l\u1ea1i, ch\u00fang gi\u00fap b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u v\u00e0 th\u00f4ng tin ng\u01b0\u1eddi d\u00f9ng trong trong c\u00e1c \u1ee9ng d\u1ee5ng. N\u00f3 t\u1ea1o ra m\u1ed9t m\u00f4i tr\u01b0\u1eddng an to\u00e0n v\u00e0 tin c\u1eady. \u0110\u00e2y l\u00e0 n\u01a1i m\u00e0 th\u00f4ng tin c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c trao \u0111\u1ed5i v\u00e0 l\u01b0u tr\u1eef. Ng\u01b0\u1eddi d\u00f9ng s\u1ebd kh\u00f4ng ph\u1ea3i lo l\u1eafng v\u1ec1 vi\u1ec7c n\u00f3 b\u1ecb \u0111\u00e1nh c\u1eafp ho\u1eb7c ti\u1ebft l\u1ed9.<\/p>\n<figure id=\"attachment_292407\" aria-describedby=\"caption-attachment-292407\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-292407 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-3.jpg\" alt=\"aes-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292407\" class=\"wp-caption-text\">AES b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u trong c\u00e1c \u1ee9ng d\u1ee5ng<\/figcaption><\/figure>\n<h3>AES b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u trong qu\u00e1 tr\u00ecnh l\u01b0u tr\u1eef<\/h3>\n<p>AES th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00e3 h\u00f3a d\u1eef li\u1ec7u tr\u01b0\u1edbc khi l\u01b0u tr\u1eef tr\u00ean c\u00e1c thi\u1ebft b\u1ecb. Ch\u1eb3ng h\u1ea1n nh\u01b0 \u1ed5 \u0111\u0129a c\u1ee9ng, USB, v\u00e0 c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n l\u01b0u tr\u1eef kh\u00e1c. \u0110i\u1ec1u n\u00e0y gi\u00fap t\u0103ng c\u01b0\u1eddng an ninh cho d\u1eef li\u1ec7u v\u00e0 ng\u0103n ch\u1eb7n truy c\u1eadp tr\u00e1i ph\u00e9p. Trong tr\u01b0\u1eddng h\u1ee3p thi\u1ebft b\u1ecb b\u1ecb m\u1ea5t m\u00e1t ho\u1eb7c \u0111\u00e1nh c\u1eafp, th\u00f4ng tin quan tr\u1ecdng kh\u00f4ng th\u1ec3 d\u1ec5 d\u00e0ng ti\u1ebfp c\u1eadn hay b\u1ecb x\u00e2m ph\u1ea1m cho m\u1ee5c \u0111\u00edch tr\u00e1i ph\u00e9p. Thu\u1eadt to\u00e1n n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0m t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt m\u00e0 c\u00f2n \u0111\u00f3ng g\u00f3p v\u00e0o vi\u1ec7c duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u. Ngay c\u1ea3 khi ch\u00fang \u0111\u01b0\u1ee3c l\u01b0u tr\u00ean c\u00e1c thi\u1ebft b\u1ecb l\u01b0u tr\u1eef c\u1ee5c b\u1ed9, \u0111\u1ed9 an to\u00e0n v\u1eabn \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o.<\/p>\n<figure id=\"attachment_292408\" aria-describedby=\"caption-attachment-292408\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-292408 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-4.jpg\" alt=\"aes-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292408\" class=\"wp-caption-text\">AES kh\u00f4ng ch\u1ec9 l\u00e0m t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt m\u00e0 c\u00f2n \u0111\u00f3ng g\u00f3p v\u00e0o vi\u1ec7c duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u khi l\u01b0u<\/figcaption><\/figure>\n<h3>AES b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u tr\u00ean thi\u1ebft b\u1ecb di \u0111\u1ed9ng<\/h3>\n<p>B\u1ea3o v\u1ec7 an to\u00e0n d\u1eef li\u1ec7u tr\u00ean thi\u1ebft b\u1ecb di \u0111\u1ed9ng l\u00e0 m\u1ed9t trong nh\u1eefng \u1ee9ng d\u1ee5ng quan tr\u1ecdng. N\u00f3 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p ch\u1eb7t ch\u1ebd v\u00e0o c\u00e1c h\u1ec7 \u0111i\u1ec1u h\u00e0nh di \u0111\u1ed9ng nh\u01b0 iOS v\u00e0 Android. T\u1eeb \u0111\u00f3, AES \u0111\u00f3ng vai tr\u00f2 ch\u00ednh trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o an ninh cho th\u00f4ng tin l\u01b0u tr\u1eef tr\u00ean \u0111\u00f3. Th\u00f4ng qua vi\u1ec7c tri\u1ec3n khai AES tr\u00ean c\u00e1c h\u1ec7 \u0111i\u1ec1u h\u00e0nh, m\u1ecdi d\u1eef li\u1ec7u \u0111\u1ec1u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd. Vi\u1ec7c m\u00e3 h\u00f3a ng\u0103n ch\u1eb7n b\u1ea5t k\u1ef3 c\u1ed1 g\u1eafng truy c\u1eadp tr\u00e1i ph\u00e9p n\u00e0o t\u1eeb b\u00ean ngo\u00e0i. \u0110i\u1ec1u n\u00e0y kh\u00f4ng ch\u1ec9 \u0111\u1ea3m b\u1ea3o t\u00ednh ri\u00eang t\u01b0 cho ng\u01b0\u1eddi s\u1eed d\u1ee5ng. C\u00e1c th\u00f4ng tin c\u00e1 nh\u00e2n, \u1ea3nh, video, v\u00e0 d\u1eef li\u1ec7u s\u1ebd h\u1ea1n ch\u1ebf r\u1ee7i ro b\u1ecb m\u1ea5t hay b\u1ecb truy c\u1eadp tr\u00e1i ph\u00e9p.<\/p>\n<p>Vi\u1ec7c t\u00edch h\u1ee3p AES v\u00e0o h\u1ec7 \u0111i\u1ec1u h\u00e0nh di \u0111\u1ed9ng c\u0169ng mang l\u1ea1i l\u1ee3i \u00edch to l\u1edbn. Ng\u01b0\u1eddi d\u00f9ng y\u00ean t\u00e2m s\u1eed d\u1ee5ng c\u00e1c t\u00ednh n\u0103ng l\u01b0u tr\u1eef v\u00e0 chia s\u1ebb d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng lo ng\u1ea1i b\u1ea3o m\u1eadt.<\/p>\n<figure id=\"attachment_292409\" aria-describedby=\"caption-attachment-292409\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-292409 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-5.jpg\" alt=\"aes-5\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292409\" class=\"wp-caption-text\">Vi\u1ec7c t\u00edch h\u1ee3p AES v\u00e0o h\u1ec7 \u0111i\u1ec1u h\u00e0nh di \u0111\u1ed9ng mang l\u1ea1i l\u1ee3i \u00edch to l\u1edbn<\/figcaption><\/figure>\n<h3>AES gi\u00fap b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u tr\u00ean \u0111\u00e1m m\u00e2y<\/h3>\n<p>Trong th\u1ebf gi\u1edbi s\u1ed1 ng\u00e0y nay, l\u01b0u tr\u1eef d\u1eef li\u1ec7u tr\u00ean \u0111\u00e1m m\u00e2y r\u1ea5t ph\u1ed5 bi\u1ebfn. C\u00e1ch l\u01b0u tr\u1eef n\u00e0y c\u00f3 nhi\u1ec1u \u01b0u \u0111i\u1ec3m. N\u00f3 mang l\u1ea1i s\u1ef1 ti\u1ec7n l\u1ee3i trong vi\u1ec7c truy c\u1eadp d\u1eef li\u1ec7u t\u1eeb b\u1ea5t k\u1ef3 \u0111\u00e2u v\u00e0 b\u1ea5t k\u1ef3 khi n\u00e0o. B\u00ean c\u1ea1nh \u0111\u00f3, kh\u00f4ng gian l\u01b0u tr\u1eef tr\u00ean c\u00e1c thi\u1ebft b\u1ecb c\u1ee5c b\u1ed9 \u0111\u01b0\u1ee3c ti\u1ebft ki\u1ec7m \u0111\u00e1ng k\u1ec3. Tuy nhi\u00ean, vi\u1ec7c n\u00e0y c\u0169ng \u0111\u1eb7t ra nh\u1eefng th\u00e1ch th\u1ee9c v\u1ec1 b\u1ea3o m\u1eadt. \u0110\u00f3 l\u00e0 v\u00ec d\u1eef li\u1ec7u khi truy\u1ec1n qua m\u1ea1ng c\u00f3 th\u1ec3 b\u1ecb \u0111\u00e1nh c\u1eafp ho\u1eb7c ti\u1ebft l\u1ed9.<\/p>\n<figure id=\"attachment_292410\" aria-describedby=\"caption-attachment-292410\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-292410 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-6.jpg\" alt=\"aes-6\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292410\" class=\"wp-caption-text\">AES gi\u00fap \u0111\u1ea3m b\u1ea3o an to\u00e0n cho d\u1eef li\u1ec7u khi ch\u00fang \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef tr\u00ean \u0111\u00e1m m\u00e2y<\/figcaption><\/figure>\n<p>\u0110\u00e2y ch\u00ednh l\u00e0 l\u00fd do AES tr\u1edf n\u00ean h\u1eefu \u00edch. Khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n qua m\u1ea1ng \u0111\u1ec3 l\u01b0u tr\u1eef tr\u00ean \u0111\u00e1m m\u00e2y, ch\u00fang th\u01b0\u1eddng m\u00e3 h\u00f3a d\u1eef li\u1ec7u. Nh\u1edd \u0111\u00f3, AES gi\u00fap b\u1ea3o v\u1ec7 ch\u00fang kh\u1ecfi nh\u1eefng k\u1ebb t\u1ea5n c\u00f4ng m\u1ea1ng. Ngo\u00e0i ra, n\u00f3 c\u0169ng gi\u00fap b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u kh\u1ecfi vi\u1ec7c truy c\u1eadp tr\u00e1i ph\u00e9p. Nh\u01b0 v\u1eady, thu\u1eadt to\u00e1n n\u00e0y kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u khi ch\u00fang \u0111\u01b0\u1ee3c truy\u1ec1n qua m\u1ea1ng. Ch\u00fang c\u00f2n gi\u00fap \u0111\u1ea3m b\u1ea3o an to\u00e0n cho d\u1eef li\u1ec7u khi ch\u00fang \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef tr\u00ean \u0111\u00e1m m\u00e2y.<\/p>\n<h3>AES gi\u00fap m\u00e3 h\u00f3a email v\u00e0 truy\u1ec1n tin an to\u00e0n<\/h3>\n<p>Trong qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a, AES b\u1ea3o v\u1ec7 n\u1ed9i dung c\u1ee7a c\u00e1c th\u00f4ng \u0111i\u1ec7p truy\u1ec1n \u0111i. Do \u0111\u00f3, ch\u00fang \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u00e0o c\u00e1c \u1ee9ng d\u1ee5ng email v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n tin an to\u00e0n. Trong h\u1ec7 th\u1ed1ng n\u00e0y, d\u1eef li\u1ec7u tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c d\u1ec5 d\u00e0ng. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra ngay c\u1ea3 khi ch\u00fang \u0111i qua c\u00e1c k\u00eanh truy\u1ec1n tr\u1ef1c tuy\u1ebfn. \u0110i\u1ec1u n\u00e0y gi\u00fap ng\u0103n ch\u1eb7n b\u1ea5t k\u1ef3 s\u1ef1 x\u00e2m ph\u1ea1m n\u00e0o v\u00e0o n\u1ed9i dung c\u1ee7a th\u00f4ng \u0111i\u1ec7p. Nh\u1edd \u0111\u00f3, th\u00f4ng tin c\u00e1 nh\u00e2n, \u00fd ki\u1ebfn, v\u00e0 c\u00e1c d\u1eef li\u1ec7u quan tr\u1ecdng kh\u00e1c \u0111\u01b0\u1ee3c b\u1ea3o m\u1eadt kh\u1ecfi m\u1ecdi hi\u1ec3m h\u1ecda ti\u1ec1m \u1ea9n.<\/p>\n<p>Ngo\u00e0i vi\u1ec7c t\u1ea1o ra m\u00f4i tr\u01b0\u1eddng giao ti\u1ebfp an to\u00e0n, AES trong m\u00e3 h\u00f3a email c\u00f2n cung c\u1ea5p m\u1ed9t t\u1ea7m nh\u00ecn t\u1ed5ng th\u1ec3 v\u1ec1 b\u1ea3o m\u1eadt. \u0110i\u1ec1u n\u00e0y \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c cung c\u1ea5p m\u1ed9t c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng b\u1ea3o m\u1eadt m\u1ea1nh m\u1ebd. T\u1eeb \u0111\u00f3, n\u00f3 th\u00fac \u0111\u1ea9y s\u1ef1 an t\u00e2m khi s\u1eed d\u1ee5ng c\u00e1c d\u1ecbch v\u1ee5 truy\u1ec1n tin quan tr\u1ecdng.<\/p>\n<figure id=\"attachment_292411\" aria-describedby=\"caption-attachment-292411\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-292411 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-7.jpg\" alt=\"aes-7\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-7.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-7-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-7-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292411\" class=\"wp-caption-text\">AES gi\u00fap m\u00e3 h\u00f3a email v\u00e0 truy\u1ec1n tin an to\u00e0n<\/figcaption><\/figure>\n<p>Trong t\u1ea5t c\u1ea3 c\u00e1c \u1ee9ng d\u1ee5ng tr\u00ean, thu\u1eadt to\u00e1n n\u00e0y ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 cung c\u1ea5p m\u1ed9t c\u1ea5p \u0111\u1ed9 b\u1ea3o m\u1eadt cao cho d\u1eef li\u1ec7u. Ch\u00fang gi\u00fap ng\u0103n ch\u1eb7n truy c\u1eadp tr\u00e1i ph\u00e9p v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a th\u00f4ng tin.<\/p>\n<h2>C\u00e1c ch\u1ebf \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a AES<\/h2>\n<p>Khi \u00e1p d\u1ee5ng thu\u1eadt to\u00e1n m\u00e3 h\u00f3a AES, ch\u00fang ta th\u01b0\u1eddng kh\u00f4ng s\u1eed d\u1ee5ng n\u00f3 \u1edf d\u1ea1ng nguy\u00ean g\u1ed1c. Thay v\u00e0o \u0111\u00f3, ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong b\u1ed1n ch\u1ebf \u0111\u1ed9 c\u01a1 b\u1ea3n c\u1ee7a m\u00e3 kh\u1ed1i n-bit. Thu\u1eadt to\u00e1n c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng trong nhi\u1ec1u ch\u1ebf \u0111\u1ed9 kh\u00e1c nhau. M\u1ed7i ch\u1ebf \u0111\u1ed9 mang l\u1ea1i c\u00e1c \u0111\u1eb7c t\u00ednh v\u00e0 \u01b0u \u0111i\u1ec3m ri\u00eang. Ch\u00fang bao g\u1ed3m: ECB, CBC, CFB v\u00e0 OFB. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u00f4 t\u1ea3 v\u1eafn t\u1eaft v\u1ec1 b\u1ed1n ch\u1ebf \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng ch\u00ednh.<\/p>\n<h3>ECB (Electronic Codebook)<\/h3>\n<p>Ch\u1ebf \u0111\u1ed9 s\u00e1ch m\u00e3 \u0111i\u1ec7n t\u1eed c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Electronic Code Book &#8211; ECB. \u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p thu\u1eadt to\u00e1n AES \u0111\u1ed9c l\u1eadp gi\u1eefa c\u00e1c kh\u1ed1i d\u1eef li\u1ec7u r\u00f5 (plaintext). Trong qu\u00e1 tr\u00ecnh n\u00e0y, m\u1ed7i kh\u1ed1i d\u1eef li\u1ec7u r\u00f5 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a ri\u00eang l\u1ebb b\u1eb1ng h\u00e0m m\u00e3 h\u00f3a \\(E_k\\) v\u1edbi kho\u00e1 m\u1eadt K. Ch\u00fang t\u1ea1o ra c\u00e1c kh\u1ed1i m\u00e3 (ciphertext) t\u01b0\u01a1ng \u1ee9ng \\(C_i = E_k(M_i)\\). Qu\u00e1 tr\u00ecnh gi\u1ea3i m\u00e3 l\u00e0 ho\u00e0n to\u00e0n \u0111\u1ed9c l\u1eadp, v\u1edbi \\(M_i = D_k(C_i)\\).<\/p>\n<figure id=\"attachment_292412\" aria-describedby=\"caption-attachment-292412\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-292412 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-8.jpg\" alt=\"aes-8\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-8.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-8-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-8-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292412\" class=\"wp-caption-text\">ECB \u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p thu\u1eadt to\u00e1n AES \u0111\u1ed9c l\u1eadp gi\u1eefa c\u00e1c kh\u1ed1i d\u1eef li\u1ec7u r\u00f5 (plaintext)<\/figcaption><\/figure>\n<p>T\u00ednh ch\u1ea5t \u0111\u1ed9c l\u1eadp c\u1ee7a ch\u1ebf \u0111\u1ed9 AES n\u00e0y gi\u00fap m\u1ed7i kh\u1ed1i d\u1eef li\u1ec7u r\u00f5 s\u1ebd \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh m\u1ed9t kh\u1ed1i m\u00e3 c\u00f3 \u0111\u1ea7u ra gi\u1ed1ng nhau. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra m\u1ed7i khi kh\u1ed1i d\u1eef li\u1ec7u xu\u1ea5t hi\u1ec7n trong qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a. Vi\u1ec7c n\u00e0y gi\u00fap t\u0103ng c\u01b0\u1eddng t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd. D\u00f9 v\u1eady c\u01a1 ch\u1ebf AES n\u00e0y c\u0169ng c\u00f3 \u0111i\u1ec3m y\u1ebfu. Ch\u00fang d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng trong m\u1ed9t s\u1ed1 t\u00ecnh hu\u1ed1ng. \u0110i\u1ec1u n\u00e0y d\u1ec5 xu\u1ea5t hi\u1ec7n khi c\u00f9ng m\u1ed9t kh\u1ed1i d\u1eef li\u1ec7u r\u00f5 xu\u1ea5t hi\u1ec7n nhi\u1ec1u l\u1ea7n. N\u00f3 c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c m\u1eabu \u0111\u1eb7c tr\u01b0ng v\u00e0 g\u00e2y nguy c\u01a1 cho t\u00ednh b\u1ea3o m\u1eadt c\u1ee7a h\u1ec7 th\u1ed1ng m\u00e3 h\u00f3a.<\/p>\n<h3>CBC (Cipher Block Chaining)<\/h3>\n<p>Ch\u1ebf \u0111\u1ed9 x\u00edch li\u00ean k\u1ebft kh\u1ed1i m\u00e3, hay c\u00f2n g\u1ecdi l\u00e0 Cipher Block Chaining (CBC). \u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 cung c\u1ea5p t\u00ednh b\u1ea3o m\u1eadt v\u00e0 to\u00e0n v\u1eb9n cho d\u1eef li\u1ec7u truy\u1ec1n qua m\u1ea1ng. Ph\u01b0\u01a1ng th\u1ee9c AES n\u00e0y chia th\u00f4ng \u0111i\u1ec7p th\u00e0nh c\u00e1c kh\u1ed1i v\u00e0 th\u1ef1c hi\u1ec7n m\u00e3 h\u00f3a t\u1eebng kh\u1ed1i b\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p v\u1edbi kh\u1ed1i tr\u01b0\u1edbc \u0111\u00f3 v\u00e0 m\u1ed9t vector kh\u1edfi t\u1ea1o duy nh\u1ea5t (IV). So v\u1edbi ch\u1ebf \u0111\u1ed9 AES kh\u00e1c l\u00e0 Electronic Code Book (ECB), CBC \u0111\u1ea1i di\u1ec7n cho m\u1ed9t s\u1ef1 ti\u1ebfn b\u1ed9 v\u00ec n\u00f3 gi\u1ea3m m\u1ee9c \u0111\u1ed9 y\u00eau c\u1ea7u v\u1ec1 b\u1ea3o m\u1eadt.<\/p>\n<figure id=\"attachment_292413\" aria-describedby=\"caption-attachment-292413\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-292413 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-9.jpg\" alt=\"aes-9\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-9.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-9-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-9-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292413\" class=\"wp-caption-text\">CBC l\u00e0 ch\u1ebf \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng AES \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 cung c\u1ea5p t\u00ednh b\u1ea3o m\u1eadt cho d\u1eef li\u1ec7u truy\u1ec1n qua m\u1ea1ng<\/figcaption><\/figure>\n<p>Trong CBC, m\u1ed7i kh\u1ed1i m\u00e3 h\u00f3a ti\u1ebfp theo \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng c\u00e1ch \u0111\u01b0a v\u00e0o thu\u1eadt to\u00e1n m\u00e3 h\u00f3a kh\u1ed1i tr\u01b0\u1edbc \u0111\u00f3. Ch\u00fang \u0111\u01b0\u1ee3c \u0111\u01b0a sau khi th\u1ef1c hi\u1ec7n ph\u00e9p XOR v\u1edbi kh\u1ed1i v\u0103n b\u1ea3n g\u1ed1c. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 CBC s\u1eed d\u1ee5ng c\u01a1 ch\u1ebf li\u00ean k\u1ebft. Qu\u00e1 tr\u00ecnh gi\u1ea3i m\u00e3 c\u1ee7a m\u1ed7i kh\u1ed1i ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ea5t c\u1ea3 c\u00e1c kh\u1ed1i m\u00e3 h\u00f3a tr\u01b0\u1edbc \u0111\u00f3. \u0110i\u1ec1u n\u00e0y mang l\u1ea1i t\u00ednh h\u1ee3p l\u1ec7 to\u00e0n b\u1ed9 cho c\u00e1c kh\u1ed1i. M\u1ed7i kh\u1ed1i v\u0103n b\u1ea3n g\u1ed1c trong CBC \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ph\u00e9p XOR v\u1edbi kh\u1ed1i m\u00e3 h\u00f3a ngay tr\u01b0\u1edbc \u0111\u00f3 tr\u01b0\u1edbc khi \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/p>\n<p>Nh\u1edd \u0111\u00f3, c\u01a1 ch\u1ebf AES n\u00e0y c\u00f3 l\u1ee3i th\u1ebf so v\u1edbi ECB. \u1ede \u0111\u00e2y, c\u00e1c m\u1eabu v\u0103n b\u1ea3n g\u1ed1c c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng nh\u1eadn bi\u1ebft th\u00f4ng qua qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a. \u0110i\u1ec1u n\u00e0y gi\u00fap CBC tr\u1edf th\u00e0nh m\u1ed9t ch\u1ebf \u0111\u1ed9 AES m\u1ea1nh m\u1ebd v\u00e0 ph\u1ed5 bi\u1ebfn trong l\u0129nh v\u1ef1c m\u1eadt m\u00e3 h\u1ecdc.<\/p>\n<h3>CFB (Cipher Feedback)<\/h3>\n<p>Ch\u1ebf \u0111\u1ed9 m\u00e3 li\u00ean k\u1ebft ng\u01b0\u1ee3c, hay c\u00f2n g\u1ecdi l\u00e0 Cipher Feedback (CFB). C\u01a1 ch\u1ebf n\u00e0y c\u1ee7a AES gi\u00fap m\u00e3 h\u00f3a d\u1eef li\u1ec7u hi\u1ec7u qu\u1ea3. Tr\u00e1i v\u1edbi Electronic Code Book (ECB) truy\u1ec1n th\u1ed1ng, CFB kh\u00f4ng \u00e1p d\u1ee5ng qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a tr\u1ef1c ti\u1ebfp cho t\u1eebng kh\u1ed1i d\u1eef li\u1ec7u r\u00f5 (plaintext). Thay v\u00e0o \u0111\u00f3, n\u00f3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t b\u1ed9 m\u00e3 h\u00f3a cho m\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u ng\u1eabu nhi\u00ean.<\/p>\n<figure id=\"attachment_292414\" aria-describedby=\"caption-attachment-292414\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-292414 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-10.jpg\" alt=\"aes-10\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-10.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-10-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-10-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292414\" class=\"wp-caption-text\">CFB ph\u00f9 h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u s\u1ef1 \u0111\u1ed3ng b\u1ed9 v\u00e0 an to\u00e0n cao<\/figcaption><\/figure>\n<p>Qu\u00e1 tr\u00ecnh b\u1eaft \u0111\u1ea7u v\u1edbi vi\u1ec7c s\u1eed d\u1ee5ng m\u1ed9t vector kh\u1edfi t\u1ea1o (Initialization Vector &#8211; IV). Sau \u0111\u00f3, ch\u00fang chuy\u1ec3n qua qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a \u0111\u1ec3 t\u1ea1o lu\u1ed3ng d\u1eef li\u1ec7u ng\u1eabu nhi\u00ean. \u0110i\u1ec1u \u0111\u1ed9c \u0111\u00e1o \u1edf \u0111\u00e2y l\u00e0 lu\u1ed3ng n\u00e0y sau \u0111\u00f3 \u0111\u01b0\u1ee3c XOR v\u1edbi d\u1eef li\u1ec7u r\u00f5, t\u1ea1o ra d\u1eef li\u1ec7u m\u00e3 h\u00f3a. M\u1ed7i b\u01b0\u1edbc trong qu\u00e1 tr\u00ecnh nh\u01b0 m\u1ed9t l\u1edbp b\u1ea3o v\u1ec7 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a. Ch\u00fang l\u00e0m t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 an to\u00e0n v\u00e0 linh ho\u1ea1t c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<p>M\u1ed7i l\u1ea7n b\u01b0\u1edbc ti\u1ebfn, lu\u1ed3ng d\u1eef li\u1ec7u ng\u1eabu nhi\u00ean \u0111\u01b0\u1ee3c d\u1ecbch chuy\u1ec3n v\u00e0 t\u00e1i s\u1eed d\u1ee5ng cho c\u00e1c b\u01b0\u1edbc m\u00e3 h\u00f3a ti\u1ebfp theo. Nh\u1edd \u0111\u00f3, qu\u00e1 tr\u00ecnh li\u00ean t\u1ee5c v\u00e0 li\u00ean k\u1ebft gi\u1eefa c\u00e1c kh\u1ed1i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh. Qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i cho \u0111\u1ebfn khi to\u00e0n b\u1ed9 d\u1eef li\u1ec7u r\u00f5 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a. C\u01a1 ch\u1ebf AES n\u00e0y gi\u00fap ti\u1ebfp c\u1eadn \u0111\u1ed9ng v\u00e0 linh ho\u1ea1t trong vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u theo d\u1ea1ng lu\u1ed3ng. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t ph\u00f9 h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u s\u1ef1 \u0111\u1ed3ng b\u1ed9 v\u00e0 an to\u00e0n cao.<\/p>\n<h3>OFB (Output Feedback)<\/h3>\n<p>Ch\u1ebf \u0111\u1ed9 m\u00e3 li\u00ean k\u1ebft ng\u01b0\u1ee3c OFB, hay Output Feedback, l\u00e0 c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a thu\u1eadt to\u00e1n m\u00e3 h\u00f3a AES. Trong ch\u1ebf \u0111\u1ed9 n\u00e0y, m\u1ed9t lu\u1ed3ng pseudo-random \u0111\u01b0\u1ee3c t\u1ea1o ra. D\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ph\u00e9p XOR v\u1edbi lu\u1ed3ng n\u00e0y \u0111\u1ec3 t\u1ea1o ra d\u1eef li\u1ec7u \u0111\u1ea7u ra \u0111\u00e3 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/p>\n<p>\u0110i\u1ec3m \u0111\u1eb7c bi\u1ec7t c\u1ee7a OFB l\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i l\u1ed7i truy\u1ec1n th\u00f4ng. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0, n\u1ebfu c\u00f3 m\u1ed9t l\u1ed7i x\u1ea3y ra trong qu\u00e1 tr\u00ecnh truy\u1ec1n d\u1eef li\u1ec7u, l\u1ed7i \u0111\u00f3 ch\u1ec9 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn m\u1ed9t kh\u1ed1i d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c kh\u1ed1i d\u1eef li\u1ec7u kh\u00e1c. \u0110i\u1ec1u n\u00e0y gi\u00fap \u0111\u1ea3m b\u1ea3o r\u1eb1ng, ngay c\u1ea3 khi c\u00f3 l\u1ed7i x\u1ea3y ra, d\u1eef li\u1ec7u v\u1eabn c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i m\u00e3 m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c m\u00e0 kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi l\u1ed7i.<\/p>\n<figure id=\"attachment_292415\" aria-describedby=\"caption-attachment-292415\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-292415 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-11.jpg\" alt=\"aes-11\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-11.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-11-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/aes-11-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-292415\" class=\"wp-caption-text\">C\u01a1 ch\u1ebf OFB th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u b\u1ea3o m\u1eadt cao<\/figcaption><\/figure>\n<p>OFB cung c\u1ea5p m\u1ed9t c\u1ea5p \u0111\u1ed9 b\u1ea3o m\u1eadt cao cho d\u1eef li\u1ec7u. \u0110\u1ed3ng th\u1eddi c\u0169ng gi\u00fap \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u khi ch\u00fang \u0111\u01b0\u1ee3c truy\u1ec1n qua m\u1ea1ng. Ch\u00ednh v\u00ec v\u1eady, c\u01a1 ch\u1ebf AES n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u b\u1ea3o m\u1eadt cao v\u00e0 \u0111\u1ed9 tin c\u1eady cao trong vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u1eeb b\u1ed1n ch\u1ebf \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng c\u01a1 b\u1ea3n tr\u00ean, \u0111\u00e3 c\u00f3 nhi\u1ec1u ch\u1ebf \u0111\u1ed9 kh\u00e1c \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n. Trong t\u01b0\u01a1ng lai, c\u00f3 th\u1ec3 ISO\/IEC s\u1ebd c\u00f4ng b\u1ed1 th\u00eam m\u1ed9t s\u1ed1 ch\u1ebf \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng AES m\u1edbi cho m\u00e3 kh\u1ed1i. Hy v\u1ecdng nh\u1eefng th\u00f4ng tin v\u1ec1 AES tr\u00ean s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u h\u01a1n v\u1ec1 thu\u1eadt to\u00e1n n\u00e0y. N\u1ebfu b\u1ea1n mu\u1ed1n kh\u00e1m ph\u00e1 nh\u1eefng th\u00f4ng tin li\u00ean quan kh\u00e1c, h\u00e3y tham kh\u1ea3o c\u00e1c b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<p>XEM TH\u00caM:<\/p>\n<ul>\n<li><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/tiktok-thay-doi-thuat-toan-nham-tranh-cam-xuc-tieu-cuc-gia-tang-cho-nguoi-xem\/\"><strong>TikTok thay \u0111\u1ed5i thu\u1eadt to\u00e1n nh\u1eb1m tr\u00e1nh c\u1ea3m x\u00fac ti\u00eau c\u1ef1c gia t\u0103ng cho ng\u01b0\u1eddi xem<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chinh-phu-my-khong-the-thu-giu-du-lieu-cua-ban-nhung-ho-co-the-mua-no\/\"><strong>Ch\u00ednh ph\u1ee7 M\u1ef9 kh\u00f4ng th\u1ec3 thu gi\u1eef d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n \u2014 nh\u01b0ng h\u1ecd c\u00f3 th\u1ec3 mua n\u00f3<\/strong><\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>AES l\u00e0 m\u1ed9t thu\u1eadt to\u00e1n m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng v\u1edbi \u0111\u1eb7c t\u00ednh \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i. Ch\u00fang c\u00f3 nhi\u1ec1u \u01b0u \u0111i\u1ec3m v\u00e0 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong nhi\u1ec1u m\u1ea3ng kh\u00e1c nhau. H\u00e3y tham kh\u1ea3o b\u00e0i vi\u1ebft sau \u0111\u1ec3 hi\u1ec3u r\u00f5 v\u1ec1 kh\u00e1i ni\u1ec7m n\u00e0y c\u0169ng nh\u01b0 c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a ch\u00fang. Thu\u1eadt to\u00e1n AES l\u00e0 g\u00ec? [&hellip;]<\/p>\n","protected":false},"author":48,"featured_media":292416,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29235,3910],"tags":[],"class_list":["post-290316","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goc-to-mo","category-kham-pha"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a d\u1eef li\u1ec7u AES l\u00e0 g\u00ec v\u00e0 c\u00e1c ch\u1ebf \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng<\/title>\n<meta name=\"description\" content=\"AES l\u00e0 m\u1ed9t thu\u1eadt to\u00e1n m\u00e3 h\u00f3a \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i. 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