{"id":478746,"date":"2023-08-09T09:37:47","date_gmt":"2023-08-09T09:37:47","guid":{"rendered":""},"modified":"2023-09-05T11:17:29","modified_gmt":"2023-09-05T11:17:29","slug":"rijndael","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/rijndael\/","title":{"rendered":"Rijndael"},"content":{"rendered":"<p>Trong l\u0129nh v\u1ef1c m\u1eadt m\u00e3, Rijndael n\u1ed5i l\u00ean nh\u01b0 m\u1ed9t thu\u1eadt to\u00e1n m\u1eadt m\u00e3 kh\u1ed1i kh\u00f3a \u0111\u1ed1i x\u1ee9ng \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao. N\u1ed5i ti\u1ebfng nh\u1edd s\u1ee9c m\u1ea1nh, t\u00ednh linh ho\u1ea1t v\u00e0 hi\u1ec7u qu\u1ea3, Rijndael \u0111\u00e3 t\u00ecm th\u1ea5y c\u00e1c \u1ee9ng d\u1ee5ng tr\u00ean ph\u1ea1m vi r\u1ed9ng trong vi\u1ec7c b\u1ea3o m\u1eadt d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m tr\u00ean nhi\u1ec1u b\u1ed1i c\u1ea3nh k\u1ef9 thu\u1eadt s\u1ed1 kh\u00e1c nhau. B\u00e0i vi\u1ebft n\u00e0y \u0111i s\u00e2u v\u00e0o l\u1ecbch s\u1eed, ho\u1ea1t \u0111\u1ed9ng b\u00ean trong, lo\u1ea1i, c\u00e1ch s\u1eed d\u1ee5ng v\u00e0 tri\u1ec3n v\u1ecdng trong t\u01b0\u01a1ng lai c\u1ee7a thu\u1eadt to\u00e1n Rijndael, l\u00e0m s\u00e1ng t\u1ecf t\u1ea7m quan tr\u1ecdng c\u1ee7a n\u00f3 trong b\u1ed1i c\u1ea3nh c\u00f4ng ngh\u1ec7 m\u00e1y ch\u1ee7 proxy.<\/p>\n<h2>L\u1ecbch s\u1eed v\u1ec1 ngu\u1ed3n g\u1ed1c c\u1ee7a Rijndael v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3<\/h2>\n<p>Rijndael, \u0111\u01b0\u1ee3c ph\u00e1t \u00e2m l\u00e0 \u201cb\u00fap b\u00ea m\u01b0a\u201d, c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb b\u1ed9 \u00f3c th\u00f4ng minh c\u1ee7a c\u00e1c nh\u00e0 m\u1eadt m\u00e3 ng\u01b0\u1eddi B\u1ec9 Vincent Rijmen v\u00e0 Joan Daemen. \u0110\u01b0\u1ee3c h\u00ecnh th\u00e0nh v\u00e0o cu\u1ed1i th\u1ebf k\u1ef7 20, m\u1eadt m\u00e3 n\u00e0y ban \u0111\u1ea7u \u0111\u01b0\u1ee3c \u0111\u01b0a ra nh\u01b0 m\u1ed9t \u1ee9ng c\u1eed vi\u00ean cho cu\u1ed9c thi Ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a n\u00e2ng cao (AES), nh\u1eb1m m\u1ee5c \u0111\u00edch ch\u1ecdn m\u1ed9t ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd \u0111\u1ec3 thay th\u1ebf Ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a d\u1eef li\u1ec7u (DES) \u0111\u00e3 c\u0169. S\u1ef1 sang tr\u1ecdng c\u1ee7a Rijndael, k\u1ebft h\u1ee3p v\u1edbi c\u00e1c \u0111\u1eb7c t\u00ednh b\u1ea3o m\u1eadt \u0111\u1eb7c bi\u1ec7t c\u1ee7a n\u00f3, \u0111\u00e3 \u0111\u01b0a n\u00f3 \u0111\u1ebfn chi\u1ebfn th\u1eafng trong cu\u1ed9c thi, gi\u00e0nh \u0111\u01b0\u1ee3c danh hi\u1ec7u AES v\u00e0o n\u0103m 2001.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Rijndael: M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1 Rijndael<\/h2>\n<p>Ho\u1ea1t \u0111\u1ed9ng c\u01a1 b\u1ea3n c\u1ee7a thu\u1eadt to\u00e1n Rijndael xoay quanh vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i c\u00e1c kh\u1ed1i d\u1eef li\u1ec7u c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh, th\u01b0\u1eddng l\u00e0 128 bit, b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng kh\u00f3a c\u00f3 \u0111\u1ed9 d\u00e0i thay \u0111\u1ed5i. Thu\u1eadt to\u00e1n kh\u00f3a \u0111\u1ed1i x\u1ee9ng n\u00e0y ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua m\u1ed9t lo\u1ea1t c\u00e1c b\u01b0\u1edbc \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng, bao g\u1ed3m c\u00e1c thao t\u00e1c thay th\u1ebf, ho\u00e1n v\u1ecb v\u00e0 tr\u1ed9n, \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n qua nhi\u1ec1u v\u00f2ng. M\u1ed7i v\u00f2ng \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u tr\u1ea3i qua m\u1ed9t qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i ph\u1ee9c t\u1ea1p, khi\u1ebfn c\u00e1c th\u1ef1c th\u1ec3 kh\u00f4ng \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n c\u1ef1c k\u1ef3 kh\u00f3 gi\u1ea3i m\u00e3 th\u00f4ng tin g\u1ed1c n\u1ebfu kh\u00f4ng c\u00f3 kh\u00f3a t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a Rijndael: Rijndael ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n<p>Ho\u1ea1t \u0111\u1ed9ng b\u00ean trong c\u1ee7a thu\u1eadt to\u00e1n Rijndael \u0111\u01b0\u1ee3c chia th\u00e0nh nhi\u1ec1u th\u00e0nh ph\u1ea7n kh\u00e1c nhau:<\/p>\n<ol>\n<li>\n<p><strong>SubByte<\/strong>: B\u01b0\u1edbc n\u00e0y li\u00ean quan \u0111\u1ebfn vi\u1ec7c thay th\u1ebf t\u1eebng byte c\u1ee7a kh\u1ed1i d\u1eef li\u1ec7u b\u1eb1ng m\u1ed9t byte t\u01b0\u01a1ng \u1ee9ng t\u1eeb h\u1ed9p thay th\u1ebf, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u1ed9p S. S\u1ef1 thay th\u1ebf n\u00e0y \u0111\u1ea3m b\u1ea3o s\u1ef1 nh\u1ea7m l\u1eabn trong d\u1eef li\u1ec7u, l\u00e0m t\u0103ng s\u1ee9c m\u1ea1nh m\u1eadt m\u00e3.<\/p>\n<\/li>\n<li>\n<p><strong>ShiftH\u00e0ng<\/strong>: C\u00e1c byte trong m\u1ed7i h\u00e0ng c\u1ee7a kh\u1ed1i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c d\u1ecbch chuy\u1ec3n theo chu k\u1ef3, t\u1ea1o ra s\u1ef1 ph\u1ed5 bi\u1ebfn v\u00e0 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt h\u01a1n n\u1eefa.<\/p>\n<\/li>\n<li>\n<p><strong>Tr\u1ed9n c\u1ed9t<\/strong>: Trong giai \u0111o\u1ea1n n\u00e0y, c\u00e1c c\u1ed9t c\u1ee7a kh\u1ed1i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c tr\u1ed9n l\u1eabn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ef1 lan truy\u1ec1n c\u00e1c thay \u0111\u1ed5i tr\u00ean to\u00e0n b\u1ed9 kh\u1ed1i.<\/p>\n<\/li>\n<li>\n<p><strong>Th\u00eamRoundKey<\/strong>: M\u1ed9t kh\u00f3a \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi kh\u1ed1i d\u1eef li\u1ec7u b\u1eb1ng thao t\u00e1c XOR theo bit, \u0111\u1ea3m b\u1ea3o r\u1eb1ng ph\u00e9p bi\u1ebfn \u0111\u1ed5i c\u1ee7a m\u1ed7i v\u00f2ng ph\u1ee5 thu\u1ed9c v\u00e0o kh\u00f3a.<\/p>\n<\/li>\n<\/ol>\n<p>C\u00e1c b\u01b0\u1edbc tr\u00ean \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i trong nhi\u1ec1u v\u00f2ng, m\u1ed7i v\u00f2ng c\u00f3 kh\u00f3a v\u00f2ng duy nh\u1ea5t ri\u00eang \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb kh\u00f3a g\u1ed1c th\u00f4ng qua m\u1ed9t quy tr\u00ecnh \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 l\u1ecbch tr\u00ecnh kh\u00f3a.<\/p>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Rijndael<\/h2>\n<p>S\u1ee9c m\u1ea1nh c\u1ee7a Rijndael n\u1eb1m \u1edf nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh:<\/p>\n<ol>\n<li>\n<p><strong>Uy\u1ec3n chuy\u1ec3n<\/strong>: Rijndael h\u1ed7 tr\u1ee3 nhi\u1ec1u k\u00edch th\u01b0\u1edbc kh\u1ed1i v\u00e0 \u0111\u1ed9 d\u00e0i kh\u00f3a kh\u00e1c nhau, gi\u00fap n\u00f3 c\u00f3 th\u1ec3 th\u00edch \u1ee9ng v\u1edbi c\u00e1c y\u00eau c\u1ea7u b\u1ea3o m\u1eadt kh\u00e1c nhau.<\/p>\n<\/li>\n<li>\n<p><strong>B\u1ea3o v\u1ec7<\/strong>: C\u00e1c ph\u00e9p bi\u1ebfn \u0111\u1ed5i ph\u1ee9c t\u1ea1p v\u00e0 n\u0103ng \u0111\u1ed9ng c\u1ee7a Rijndael, c\u00f9ng v\u1edbi kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng m\u1eadt m\u00e3 \u0111\u00e3 bi\u1ebft, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t l\u1ef1a ch\u1ecdn an to\u00e0n \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<li>\n<p><strong>Hi\u1ec7u qu\u1ea3<\/strong>: M\u1eb7c d\u00f9 c\u00f3 t\u00ednh b\u1ea3o m\u1eadt \u0111\u00e1ng g\u1eddm nh\u01b0ng c\u00e1c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Rijndael \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a cao, \u0111\u1ea3m b\u1ea3o qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 hi\u1ec7u qu\u1ea3.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i Rijndael: Ph\u00e2n t\u00edch<\/h2>\n<p>Rijndael c\u00f3 nhi\u1ec1u c\u1ea5u h\u00ecnh, cung c\u1ea5p c\u00e1c k\u00edch th\u01b0\u1edbc kh\u1ed1i v\u00e0 \u0111\u1ed9 d\u00e0i kh\u00f3a kh\u00e1c nhau. \u0110\u00e2y l\u00e0 m\u1ed9t s\u1ef1 c\u1ed1:<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: center;\"><strong>K\u00edch th\u01b0\u1edbc kh\u1ed1i<\/strong><\/th>\n<th style=\"text-align: center;\"><strong>\u0110\u1ed9 d\u00e0i ph\u00edm<\/strong><\/th>\n<th style=\"text-align: center;\"><strong>S\u1ed1 v\u00f2ng<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: center;\">128 bit<\/td>\n<td style=\"text-align: center;\">128, 192, 256 bit<\/td>\n<td style=\"text-align: center;\">10<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">192 bit<\/td>\n<td style=\"text-align: center;\">128, 192, 256 bit<\/td>\n<td style=\"text-align: center;\">12<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">256 bit<\/td>\n<td style=\"text-align: center;\">128, 192, 256 bit<\/td>\n<td style=\"text-align: center;\">14<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng Rijndael, c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p c\u1ee7a ch\u00fang<\/h2>\n<p>Rijndael t\u00ecm th\u1ea5y c\u00e1c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u, li\u00ean l\u1ea1c an to\u00e0n v\u00e0 ch\u1eef k\u00fd s\u1ed1. Tuy nhi\u00ean, gi\u1ed1ng nh\u01b0 b\u1ea5t k\u1ef3 h\u1ec7 th\u1ed1ng m\u1eadt m\u00e3 n\u00e0o, n\u00f3 kh\u00f4ng tr\u00e1nh kh\u1ecfi nh\u1eefng th\u00e1ch th\u1ee9c. C\u00e1c v\u1ea5n \u0111\u1ec1 ti\u1ec1m \u1ea9n bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Qu\u1ea3n l\u00fd kh\u00f3a<\/strong>: Vi\u1ec7c b\u1ea3o v\u1ec7 v\u00e0 qu\u1ea3n l\u00fd c\u00e1c kh\u00f3a m\u00e3 h\u00f3a l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 ng\u0103n ch\u1eb7n truy c\u1eadp tr\u00e1i ph\u00e9p.<\/li>\n<li><strong>T\u1ea5n c\u00f4ng k\u00eanh b\u00ean<\/strong>: C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng n\u00e0y khai th\u00e1c s\u1ef1 r\u00f2 r\u1ec9 th\u00f4ng tin ngo\u00e0i \u00fd mu\u1ed1n trong qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a. C\u00e1c bi\u1ec7n ph\u00e1p \u0111\u1ed1i ph\u00f3 li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng thu\u1eadt to\u00e1n li\u00ean t\u1ee5c v\u00e0 ph\u1ea7n c\u1ee9ng an to\u00e0n.<\/li>\n<\/ul>\n<h2>\u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh<\/h2>\n<table>\n<thead>\n<tr>\n<th><strong>\u0111\u1eb7c tr\u01b0ng<\/strong><\/th>\n<th><strong>Rijndael<\/strong><\/th>\n<th><strong>DES<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Ki\u1ec3u<\/strong><\/td>\n<td>Kh\u00f3a \u0111\u1ed1i x\u1ee9ng<\/td>\n<td>Kh\u00f3a \u0111\u1ed1i x\u1ee9ng<\/td>\n<\/tr>\n<tr>\n<td><strong>K\u00edch th\u01b0\u1edbc kh\u1ed1i<\/strong><\/td>\n<td>Bi\u1ebfn \u0111\u1ed5i<\/td>\n<td>64 bit<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ed9 d\u00e0i ph\u00edm<\/strong><\/td>\n<td>Bi\u1ebfn \u0111\u1ed5i<\/td>\n<td>56 bit<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ea3o v\u1ec7<\/strong><\/td>\n<td>B\u1ea3o m\u1eadt cao<\/td>\n<td>D\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng<\/td>\n<\/tr>\n<tr>\n<td><strong>Hi\u1ec7u qu\u1ea3<\/strong><\/td>\n<td>C\u00f3 hi\u1ec7u qu\u1ea3<\/td>\n<td>T\u01b0\u01a1ng \u0111\u1ed1i ch\u1eadm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn Rijndael<\/h2>\n<p>T\u01b0\u01a1ng lai c\u1ee7a Rijndael g\u1eafn li\u1ec1n v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00f4ng ngh\u1ec7 m\u00e3 h\u00f3a. Khi \u0111i\u1ec7n to\u00e1n l\u01b0\u1ee3ng t\u1eed ti\u1ebfn b\u1ed9, m\u1ed1i lo ng\u1ea1i v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng l\u01b0\u1ee3ng t\u1eed c\u1ee7a thu\u1eadt to\u00e1n c\u00f3 th\u1ec3 n\u1ea3y sinh. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111ang kh\u00e1m ph\u00e1 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p m\u00e3 h\u00f3a h\u1eadu l\u01b0\u1ee3ng t\u1eed c\u00f3 kh\u1ea3 n\u0103ng b\u1ed5 sung ho\u1eb7c thay th\u1ebf c\u00e1c thu\u1eadt to\u00e1n hi\u1ec7n c\u00f3 nh\u01b0 Rijndael.<\/p>\n<h2>Rijndael v\u00e0 m\u00e1y ch\u1ee7 proxy: K\u1ebft n\u1ed1i hi\u1ec7p l\u1ef1c<\/h2>\n<p>N\u0103ng l\u1ef1c m\u00e3 h\u00f3a c\u1ee7a Rijndael ph\u00f9 h\u1ee3p ho\u00e0n h\u1ea3o v\u1edbi nhi\u1ec7m v\u1ee5 c\u1ee7a m\u00e1y ch\u1ee7 proxy. C\u00e1c m\u00e1y ch\u1ee7 n\u00e0y \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa kh\u00e1ch h\u00e0ng v\u00e0 m\u1ea1ng internet r\u1ed9ng h\u01a1n, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho vi\u1ec7c \u1ea9n danh, b\u1ea3o m\u1eadt v\u00e0 ki\u1ec3m so\u00e1t truy c\u1eadp. Kh\u1ea3 n\u0103ng m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd c\u1ee7a Rijndael c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c khai th\u00e1c \u0111\u1ec3 b\u1ea3o m\u1eadt vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 proxy, b\u1ea3o v\u1ec7 th\u00f4ng tin nh\u1ea1y c\u1ea3m kh\u1ecfi nh\u1eefng k\u1ebb nghe tr\u1ed9m ti\u1ec1m \u1ea9n v\u00e0 c\u00e1c m\u1ed1i \u0111e d\u1ecda m\u1ea1ng.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ed1i v\u1edbi nh\u1eefng ng\u01b0\u1eddi mu\u1ed1n t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 th\u1ebf gi\u1edbi Rijndael v\u00e0 m\u00e3 h\u00f3a, c\u00e1c t\u00e0i nguy\u00ean sau cung c\u1ea5p th\u00f4ng tin c\u00f3 gi\u00e1 tr\u1ecb:<\/p>\n<ul>\n<li><a href=\"https:\/\/csrc.nist.gov\/projects\/encryption-standards\/aes\/\" target=\"_new\" rel=\"noopener nofollow\">Vi\u1ec7n Ti\u00eau chu\u1ea9n v\u00e0 C\u00f4ng ngh\u1ec7 Qu\u1ed1c gia (NIST) \u2013 AES Information<\/a><\/li>\n<li><a href=\"https:\/\/www.esat.kuleuven.be\/~rijmen\/rijndael\/\" target=\"_new\" rel=\"noopener nofollow\">Trang ch\u1ee7 c\u1ee7a Vincent Rijmen<\/a><\/li>\n<li><a href=\"https:\/\/www.esat.kuleuven.be\/~rijmen\/rijndael\/\" target=\"_new\" rel=\"noopener nofollow\">Trang ch\u1ee7 c\u1ee7a Joan Daemen<\/a><\/li>\n<\/ul>\n<p>T\u00f3m l\u1ea1i, h\u00e0nh tr\u00ecnh c\u1ee7a Rijndael t\u1eeb khi th\u00e0nh l\u1eadp \u0111\u1ebfn vai tr\u00f2 then ch\u1ed1t c\u1ee7a n\u00f3 trong m\u00e3 h\u00f3a hi\u1ec7n \u0111\u1ea1i \u0111\u00e3 c\u1ee7ng c\u1ed1 v\u1ecb tr\u00ed c\u1ee7a n\u00f3 trong bi\u00ean ni\u00ean s\u1eed v\u1ec1 m\u1eadt m\u00e3. Khi c\u00f4ng ngh\u1ec7 ti\u1ebfn b\u1ed9, di s\u1ea3n c\u1ee7a Rijndael ti\u1ebfp t\u1ee5c \u0111\u1ecbnh h\u00ecnh b\u1ed1i c\u1ea3nh b\u1ea3o m\u1eadt d\u1eef li\u1ec7u, v\u01b0\u1ee3t qua c\u00e1c ranh gi\u1edbi v\u00e0 c\u1ee7ng c\u1ed1 c\u00e1c t\u01b0\u01a1ng t\u00e1c k\u1ef9 thu\u1eadt s\u1ed1.<\/p>","protected":false},"featured_media":478747,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-478746","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Rijndael: Unveiling the Secrets of a Powerful Encryption Algorithm<\/mark>","faq_items":[{"question":"What is Rijndael and how does it relate to data security?","answer":"<p>Rijndael is a highly advanced symmetric-key block cipher algorithm, widely recognized for its exceptional strength and efficiency in encryption. It plays a crucial role in securing sensitive data across various digital platforms. In this article, we delve into the algorithm's history, functioning, types, and its relevance to proxy server technology.<\/p>"},{"question":"Who developed the Rijndael algorithm?","answer":"<p>The Rijndael algorithm was developed by Belgian cryptographers Vincent Rijmen and Joan Daemen. It was conceived in the late 20th century and gained prominence as the winner of the Advanced Encryption Standard (AES) competition in 2001, replacing the outdated Data Encryption Standard (DES).<\/p>"},{"question":"How does Rijndael encryption work?","answer":"<p>Rijndael operates through a series of defined steps including SubBytes, ShiftRows, MixColumns, and AddRoundKey. These steps are performed over multiple rounds, with each round contributing to the complex transformation of data. This dynamic process, coupled with the use of a variable-length key, makes it extremely difficult for unauthorized entities to decipher the original data without the corresponding key.<\/p>"},{"question":"What are the main features of Rijndael?","answer":"<p>Rijndael boasts several key features:<\/p><ul><li><strong>Flexibility<\/strong>: It supports various block sizes and key lengths, making it adaptable to diverse security needs.<\/li><li><strong>Security<\/strong>: Its intricate transformations and resistance to known attacks ensure robust data protection.<\/li><li><strong>Efficiency<\/strong>: Despite its strong security, Rijndael's operations are optimized for efficient encryption and decryption processes.<\/li><\/ul>"},{"question":"Are there different types of Rijndael?","answer":"<p>Yes, Rijndael comes in various configurations based on block size, key length, and number of rounds. Here's a breakdown:<\/p><ul><li><strong>Block Size<\/strong>: 128 bits, 192 bits, 256 bits<\/li><li><strong>Key Length<\/strong>: 128 bits, 192 bits, 256 bits<\/li><li><strong>Number of Rounds<\/strong>: 10 rounds, 12 rounds, 14 rounds<\/li><\/ul>"},{"question":"How is Rijndael used in proxy server technology?","answer":"<p>Rijndael's exceptional encryption capabilities align perfectly with the goals of proxy servers. These servers act as intermediaries between clients and the internet, ensuring anonymity and security. By employing Rijndael encryption, data transmission between clients and proxy servers is fortified, safeguarding sensitive information from potential threats.<\/p>"},{"question":"What challenges might be associated with using Rijndael?","answer":"<p>Some challenges include:<\/p><ul><li><strong>Key Management<\/strong>: Ensuring secure storage and management of encryption keys.<\/li><li><strong>Side-Channel Attacks<\/strong>: Countermeasures involve using constant-time algorithms and secure hardware to prevent unintended information leakage.<\/li><\/ul>"},{"question":"How does Rijndael compare to other encryption methods?","answer":"<p>In comparison to DES, Rijndael is highly secure, supports variable block sizes and key lengths, and offers efficient performance. DES, on the other hand, is vulnerable due to its fixed block size and key length.<\/p>"},{"question":"What's the future of Rijndael in encryption?","answer":"<p>As quantum computing advances, the security landscape might change. While Rijndael remains strong, researchers are exploring post-quantum encryption methods to ensure data protection in evolving technological environments.<\/p>"},{"question":"Where can I find more information about Rijndael?","answer":"<p>For more insights into Rijndael and encryption, check out the following resources:<\/p><ul><li><a href=\"https:\/\/csrc.nist.gov\/projects\/encryption-standards\/aes\/\" target=\"_new\">NIST - AES Information<\/a><\/li><li><a href=\"https:\/\/www.esat.kuleuven.be\/~rijmen\/rijndael\/\" target=\"_new\">Vincent Rijmen's Homepage<\/a><\/li><li><a href=\"https:\/\/www.esat.kuleuven.be\/~rijmen\/rijndael\/\" target=\"_new\">Joan Daemen's Homepage<\/a><\/li><\/ul>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478746","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478746\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/478747"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=478746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}