{"id":479218,"date":"2023-08-09T10:31:59","date_gmt":"2023-08-09T10:31:59","guid":{"rendered":""},"modified":"2023-09-05T11:18:23","modified_gmt":"2023-09-05T11:18:23","slug":"symmetric-encryption","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/symmetric-encryption\/","title":{"rendered":"M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng"},"content":{"rendered":"

M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a c\u01a1 b\u1ea3n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch chuy\u1ec3n \u0111\u1ed5i n\u00f3 sang \u0111\u1ecbnh d\u1ea1ng kh\u00f4ng th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c, \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt v\u00e0 to\u00e0n v\u1eb9n. N\u00f3 d\u1ef1a v\u00e0o m\u1ed9t kh\u00f3a b\u00ed m\u1eadt duy nh\u1ea5t \u0111\u01b0\u1ee3c chia s\u1ebb gi\u1eefa ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 th\u00f4ng tin. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u th\u1ebf k\u1ef7 v\u00e0 ti\u1ebfp t\u1ee5c \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i.<\/p>\n

L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3<\/h2>\n

L\u1ecbch s\u1eed c\u1ee7a m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng b\u1eaft ngu\u1ed3n t\u1eeb th\u1eddi c\u1ed5 \u0111\u1ea1i khi c\u00e1c n\u1ec1n v\u0103n minh kh\u00e1c nhau s\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p m\u00e3 h\u00f3a th\u00f4 s\u01a1 \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c th\u00f4ng \u0111i\u1ec7p nh\u1ea1y c\u1ea3m. M\u1ed9t trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng \u0111\u01b0\u1ee3c ghi nh\u1eadn s\u1edbm nh\u1ea5t l\u00e0 m\u1eadt m\u00e3 Caesar, \u0111\u01b0\u1ee3c \u0111\u1eb7t theo t\u00ean c\u1ee7a Julius Caesar, ng\u01b0\u1eddi \u0111\u00e3 s\u1eed d\u1ee5ng n\u00f3 \u0111\u1ec3 m\u00e3 h\u00f3a th\u00f4ng tin li\u00ean l\u1ea1c qu\u00e2n s\u1ef1 c\u1ee7a m\u00ecnh. M\u1eadt m\u00e3 Caesar l\u00e0 m\u1ed9t m\u1eadt m\u00e3 thay th\u1ebf trong \u0111\u00f3 m\u1ed7i ch\u1eef c\u00e1i trong b\u1ea3n r\u00f5 \u0111\u01b0\u1ee3c d\u1ecbch chuy\u1ec3n m\u1ed9t s\u1ed1 v\u1ecb tr\u00ed c\u1ed1 \u0111\u1ecbnh trong b\u1ea3ng ch\u1eef c\u00e1i.<\/p>\n

Th\u00f4ng tin chi ti\u1ebft v\u1ec1 m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng<\/h2>\n

M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean t\u1eafc \u00e1p d\u1ee5ng thu\u1eadt to\u00e1n v\u00e0 kh\u00f3a b\u00ed m\u1eadt cho d\u1eef li\u1ec7u v\u0103n b\u1ea3n g\u1ed1c, t\u1ea1o ra b\u1ea3n m\u00e3 ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i m\u00e3 tr\u1edf l\u1ea1i d\u1ea1ng ban \u0111\u1ea7u b\u1eb1ng c\u00f9ng m\u1ed9t kh\u00f3a. Qu\u00e1 tr\u00ecnh n\u00e0y bao g\u1ed3m ba th\u00e0nh ph\u1ea7n ch\u00ednh: thu\u1eadt to\u00e1n m\u00e3 h\u00f3a, kh\u00f3a b\u00ed m\u1eadt v\u00e0 d\u1eef li\u1ec7u v\u0103n b\u1ea3n g\u1ed1c. Khi ng\u01b0\u1eddi g\u1eedi mu\u1ed1n b\u1ea3o v\u1ec7 tin nh\u1eafn, h\u1ecd \u00e1p d\u1ee5ng thu\u1eadt to\u00e1n m\u00e3 h\u00f3a v\u00e0 kh\u00f3a chung cho b\u1ea3n r\u00f5, t\u1ea1o ra b\u1ea3n m\u00e3. Ng\u01b0\u1eddi nh\u1eadn, s\u1edf h\u1eefu c\u00f9ng m\u1ed9t kh\u00f3a, sau \u0111\u00f3 c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng thu\u1eadt to\u00e1n gi\u1ea3i m\u00e3 \u0111\u1ec3 kh\u00f4i ph\u1ee5c tin nh\u1eafn g\u1ed1c.<\/p>\n

M\u1ed9t trong nh\u1eefng \u01b0u \u0111i\u1ec3m ch\u00ednh c\u1ee7a m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng l\u00e0 hi\u1ec7u qu\u1ea3 trong vi\u1ec7c x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn do y\u00eau c\u1ea7u t\u00ednh to\u00e1n t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u01a1n gi\u1ea3n. Tuy nhi\u00ean, m\u1ed9t th\u00e1ch th\u1ee9c \u0111\u00e1ng k\u1ec3 n\u1eb1m \u1edf vi\u1ec7c ph\u00e2n ph\u1ed1i kh\u00f3a b\u00ed m\u1eadt m\u1ed9t c\u00e1ch an to\u00e0n gi\u1eefa c\u00e1c b\u00ean giao ti\u1ebfp m\u00e0 kh\u00f4ng b\u1ecb \u0111\u1ed1i th\u1ee7 ch\u1eb7n.<\/p>\n

C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng v\u00e0 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng<\/h2>\n

Ho\u1ea1t \u0111\u1ed9ng b\u00ean trong c\u1ee7a m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng d\u1ef1a tr\u00ean c\u00e1c nguy\u00ean t\u1eafc m\u00e3 h\u00f3a nguy\u00ean th\u1ee7y nh\u01b0 m\u1eadt m\u00e3 kh\u1ed1i v\u00e0 m\u1eadt m\u00e3 lu\u1ed3ng. M\u1eadt m\u00e3 kh\u1ed1i chia v\u0103n b\u1ea3n g\u1ed1c th\u00e0nh c\u00e1c kh\u1ed1i c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh v\u00e0 m\u00e3 h\u00f3a t\u1eebng kh\u1ed1i m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp, trong khi m\u1eadt m\u00e3 lu\u1ed3ng m\u00e3 h\u00f3a d\u1eef li\u1ec7u theo t\u1eebng bit ho\u1eb7c t\u1eebng byte.<\/p>\n

Qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00f3m t\u1eaft theo c\u00e1c b\u01b0\u1edbc sau:<\/p>\n

    \n
  1. T\u1ea1o kh\u00f3a<\/strong>: C\u1ea3 ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn ph\u1ea3i th\u1ed1ng nh\u1ea5t v\u1ec1 kh\u00f3a b\u00ed m\u1eadt v\u00e0 gi\u1eef b\u00ed m\u1eadt.<\/li>\n
  2. M\u00e3 h\u00f3a<\/strong>: Ng\u01b0\u1eddi g\u1eedi \u00e1p d\u1ee5ng thu\u1eadt to\u00e1n m\u00e3 h\u00f3a \u0111\u00e3 ch\u1ecdn v\u00e0 kh\u00f3a b\u00ed m\u1eadt chung cho b\u1ea3n r\u00f5 \u0111\u1ec3 t\u1ea1o ra b\u1ea3n m\u00e3.<\/li>\n
  3. gi\u1ea3i m\u00e3<\/strong>: Ng\u01b0\u1eddi nh\u1eadn \u00e1p d\u1ee5ng c\u00f9ng m\u1ed9t thu\u1eadt to\u00e1n m\u00e3 h\u00f3a v\u00e0 kh\u00f3a b\u00ed m\u1eadt d\u00f9ng chung cho b\u1ea3n m\u00e3 \u0111\u1ec3 kh\u00f4i ph\u1ee5c b\u1ea3n r\u00f5 g\u1ed1c.<\/li>\n<\/ol>\n

    Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng<\/h2>\n

    M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng th\u1ec3 hi\u1ec7n m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u:<\/p>\n

      \n
    1. T\u1ed1c \u0111\u1ed9<\/strong>: M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng th\u01b0\u1eddng nhanh h\u01a1n m\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng do c\u00e1c ph\u00e9p to\u00e1n \u0111\u01a1n gi\u1ea3n c\u1ee7a n\u00f3.<\/li>\n
    2. B\u1ea3o v\u1ec7<\/strong>: T\u00ednh b\u1ea3o m\u1eadt c\u1ee7a m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o \u0111\u1ed9 m\u1ea1nh c\u1ee7a kh\u00f3a b\u00ed m\u1eadt. \u0110\u1ed9 d\u00e0i kh\u00f3a d\u00e0i h\u01a1n s\u1ebd n\u00e2ng cao t\u00ednh b\u1ea3o m\u1eadt nh\u01b0ng c\u00f3 th\u1ec3 ph\u1ea3i ch\u1ecbu chi ph\u00ed x\u1eed l\u00fd t\u0103ng l\u00ean.<\/li>\n
    3. B\u1ea3o m\u1eadt<\/strong>: N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng nh\u1eefng c\u00e1 nh\u00e2n kh\u00f4ng c\u00f3 th\u1ea9m quy\u1ec1n kh\u00f4ng th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a n\u1ebfu kh\u00f4ng c\u00f3 kh\u00f3a ch\u00ednh x\u00e1c.<\/li>\n
    4. Ch\u00ednh tr\u1ef1c<\/strong>: M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n xem d\u1eef li\u1ec7u c\u00f3 b\u1ecb gi\u1ea3 m\u1ea1o trong qu\u00e1 tr\u00ecnh truy\u1ec1n hay kh\u00f4ng, \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u.<\/li>\n
    5. Kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch<\/strong>: Nhi\u1ec1u thu\u1eadt to\u00e1n m\u00e3 h\u00f3a \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a, \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch tr\u00ean nhi\u1ec1u h\u1ec7 th\u1ed1ng kh\u00e1c nhau.<\/li>\n<\/ol>\n

      C\u00e1c lo\u1ea1i m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng<\/h2>\n

      M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng bao g\u1ed3m nhi\u1ec1u thu\u1eadt to\u00e1n kh\u00e1c nhau, m\u1ed7i thu\u1eadt to\u00e1n \u0111\u1ec1u c\u00f3 \u0111i\u1ec3m m\u1ea1nh v\u00e0 \u0111i\u1ec3m y\u1ebfu ri\u00eang. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 lo\u1ea1i ph\u1ed5 bi\u1ebfn:<\/p>\n\n\n\n\n\n\n\n\n\n\n
      Ki\u1ec3u<\/th>\nS\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n
      Ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a n\u00e2ng cao (AES)<\/td>\nM\u1eadt m\u00e3 kh\u1ed1i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i v\u1edbi k\u00edch th\u01b0\u1edbc kh\u00f3a 128, 192 ho\u1eb7c 256 bit.<\/td>\n<\/tr>\n
      Ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a d\u1eef li\u1ec7u (DES)<\/td>\nM\u1ed9t m\u1eadt m\u00e3 kh\u1ed1i c\u0169 h\u01a1n c\u00f3 k\u00edch th\u01b0\u1edbc kh\u00f3a 56 bit, hi\u1ec7n \u0111\u01b0\u1ee3c coi l\u00e0 k\u00e9m an to\u00e0n h\u01a1n.<\/td>\n<\/tr>\n
      Ba DES (3DES)<\/td>\nM\u1ed9t bi\u1ebfn th\u1ec3 an to\u00e0n h\u01a1n c\u1ee7a DES \u00e1p d\u1ee5ng thu\u1eadt to\u00e1n DES ba l\u1ea7n.<\/td>\n<\/tr>\n
      M\u1eadt m\u00e3 Rivest (RC)<\/td>\nH\u1ecd m\u1eadt m\u00e3 d\u00f2ng, bao g\u1ed3m RC4 v\u00e0 RC5.<\/td>\n<\/tr>\n
      C\u00e1 n\u00f3c<\/td>\nM\u1eadt m\u00e3 kh\u1ed1i nhanh v\u1edbi k\u00edch th\u01b0\u1edbc kh\u00f3a thay \u0111\u1ed5i.<\/td>\n<\/tr>\n
      Hai con c\u00e1<\/td>\nM\u1ed9t \u1ee9ng d\u1ee5ng l\u1ecdt v\u00e0o v\u00f2ng chung k\u1ebft c\u1ee7a AES \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn nh\u1edd t\u00ednh linh ho\u1ea1t v\u00e0 b\u1ea3o m\u1eadt.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng, c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng<\/h2>\n

      M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng t\u00ecm th\u1ea5y c\u00e1c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n

        \n
      1. Truy\u1ec1n th\u00f4ng an to\u00e0n<\/strong>: B\u1ea3o v\u1ec7 d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m trong qu\u00e1 tr\u00ecnh truy\u1ec1n qua m\u1ea1ng, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u00e3 h\u00f3a email ho\u1eb7c m\u1ea1ng ri\u00eang \u1ea3o (VPN).<\/li>\n
      2. L\u01b0u tr\u1eef d\u1eef li\u1ec7u<\/strong>: B\u1ea3o v\u1ec7 c\u00e1c t\u1ec7p v\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u tr\u00ean b\u1ed9 nh\u1edb c\u1ee5c b\u1ed9 ho\u1eb7c tr\u00ean \u0111\u00e1m m\u00e2y kh\u1ecfi b\u1ecb truy c\u1eadp tr\u00e1i ph\u00e9p.<\/li>\n
      3. X\u00e1c th\u1ef1c<\/strong>: X\u00e1c minh danh t\u00ednh c\u1ee7a ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c thi\u1ebft b\u1ecb th\u00f4ng qua m\u00e3 th\u00f4ng b\u00e1o x\u00e1c th\u1ef1c \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/li>\n<\/ol>\n

        Tuy nhi\u00ean, vi\u1ec7c s\u1eed d\u1ee5ng m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng \u0111i k\u00e8m v\u1edbi nh\u1eefng th\u00e1ch th\u1ee9c, ch\u1eb3ng h\u1ea1n nh\u01b0:<\/p>\n

          \n
        1. Qu\u1ea3n l\u00fd kh\u00f3a<\/strong>: Vi\u1ec7c ph\u00e2n ph\u1ed1i v\u00e0 l\u01b0u tr\u1eef an to\u00e0n c\u00e1c kh\u00f3a b\u00ed m\u1eadt l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 ng\u0103n ch\u1eb7n truy c\u1eadp tr\u00e1i ph\u00e9p.<\/li>\n
        2. Trao \u0111\u1ed5i kh\u00f3a<\/strong>: Vi\u1ec7c thi\u1ebft l\u1eadp c\u01a1 ch\u1ebf trao \u0111\u1ed5i kh\u00f3a an to\u00e0n c\u00f3 th\u1ec3 ph\u1ee9c t\u1ea1p, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c h\u1ec7 th\u1ed1ng quy m\u00f4 l\u1edbn.<\/li>\n
        3. Xoay ph\u00edm<\/strong>: Vi\u1ec7c thay \u0111\u1ed5i kh\u00f3a th\u01b0\u1eddng xuy\u00ean l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt nh\u01b0ng n\u00f3 c\u00f3 th\u1ec3 l\u00e0m gi\u00e1n \u0111o\u1ea1n ho\u1ea1t \u0111\u1ed9ng li\u00ean l\u1ea1c \u0111ang di\u1ec5n ra.<\/li>\n<\/ol>\n

          \u0110\u1ec3 gi\u1ea3i quy\u1ebft nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y, c\u00e1c ph\u01b0\u01a1ng ph\u00e1p hay nh\u1ea5t bao g\u1ed3m s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd kh\u00f3a an to\u00e0n, s\u1eed d\u1ee5ng thu\u1eadt to\u00e1n t\u1ea1o kh\u00f3a m\u1ea1nh v\u00e0 tri\u1ec3n khai quy tr\u00ecnh xoay v\u00f2ng kh\u00f3a th\u00edch h\u1ee3p.<\/p>\n

          C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n\n\n\n\n\n\n\n\n\n
          Thu\u1eadt ng\u1eef<\/th>\nS\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n
          M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng<\/td>\nS\u1eed d\u1ee5ng m\u1ed9t kh\u00f3a chung duy nh\u1ea5t \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3.<\/td>\n<\/tr>\n
          M\u00e3 h\u00f3a b\u1ea5t \u0111\u1ed1i x\u1ee9ng<\/td>\nS\u1eed d\u1ee5ng m\u1ed9t c\u1eb7p kh\u00f3a (c\u00f4ng khai v\u00e0 ri\u00eang t\u01b0) \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3.<\/td>\n<\/tr>\n
          Thu\u1eadt to\u00e1n m\u00e3 h\u00f3a<\/td>\nQu\u00e1 tr\u00ecnh to\u00e1n h\u1ecdc \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 d\u1eef li\u1ec7u.<\/td>\n<\/tr>\n
          V\u0103n b\u1ea3n m\u1eadt m\u00e3<\/td>\nD\u1ea1ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/td>\n<\/tr>\n
          V\u0103n b\u1ea3n th\u00f4<\/td>\nD\u1eef li\u1ec7u g\u1ed1c, kh\u00f4ng \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Tri\u1ec3n v\u1ecdng v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng<\/h2>\n

          T\u01b0\u01a1ng lai c\u1ee7a m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng n\u1eb1m \u1edf s\u1ef1 ph\u00e1t tri\u1ec3n li\u00ean t\u1ee5c c\u1ee7a c\u00e1c thu\u1eadt to\u00e1n m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd, t\u1eadp trung v\u00e0o c\u00e1c k\u1ef9 thu\u1eadt qu\u1ea3n l\u00fd, ph\u00e2n ph\u1ed1i v\u00e0 xoay kh\u00f3a. Ngo\u00e0i ra, nh\u1eefng ti\u1ebfn b\u1ed9 trong \u0111i\u1ec7n to\u00e1n l\u01b0\u1ee3ng t\u1eed c\u00f3 th\u1ec3 c\u00f3 \u00fd ngh\u0129a \u0111\u1ed1i v\u1edbi m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng truy\u1ec1n th\u1ed1ng, th\u00fac \u0111\u1ea9y nghi\u00ean c\u1ee9u v\u1ec1 c\u00e1c thu\u1eadt to\u00e1n kh\u00e1ng l\u01b0\u1ee3ng t\u1eed.<\/p>\n

          C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng<\/h2>\n

          M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa ng\u01b0\u1eddi d\u00f9ng v\u00e0 internet, t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt v\u00e0 quy\u1ec1n ri\u00eang t\u01b0. Ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng theo nhi\u1ec1u c\u00e1ch:<\/p>\n

            \n
          1. M\u00e3 h\u00f3a l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng \u0111\u1ec3 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 proxy, b\u1ed5 sung th\u00eam m\u1ed9t l\u1edbp b\u1ea3o v\u1ec7.<\/li>\n
          2. Ki\u1ec3m so\u00e1t truy c\u1eadp<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 th\u1ef1c thi c\u00e1c giao th\u1ee9c m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng cho c\u00e1c k\u1ebft n\u1ed1i \u0111\u1ebfn v\u00e0 \u0111i \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c k\u00eanh li\u00ean l\u1ea1c an to\u00e0n.<\/li>\n<\/ol>\n

            Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n

            \u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng v\u00e0 c\u00e1c ch\u1ee7 \u0111\u1ec1 li\u00ean quan, vui l\u00f2ng tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n

              \n
            1. Vi\u1ec7n Ti\u00eau chu\u1ea9n v\u00e0 C\u00f4ng ngh\u1ec7 Qu\u1ed1c gia (NIST) \u2013 Ti\u00eau chu\u1ea9n h\u00f3a M\u00e3 h\u00f3a<\/a><\/li>\n
            2. Hi\u1ec7p h\u1ed9i qu\u1ed1c t\u1ebf v\u1ec1 nghi\u00ean c\u1ee9u m\u1eadt m\u00e3 (IACR)<\/a><\/li>\n
            3. Crypto 101: M\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng<\/a><\/li>\n<\/ol>\n

              T\u00f3m l\u1ea1i, m\u00e3 h\u00f3a \u0111\u1ed1i x\u1ee9ng v\u1eabn l\u00e0 tr\u1ee5 c\u1ed9t quan tr\u1ecdng c\u1ee7a b\u1ea3o m\u1eadt d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i, mang l\u1ea1i t\u1ed1c \u0111\u1ed9, hi\u1ec7u qu\u1ea3 v\u00e0 t\u00ednh b\u1ea3o m\u1eadt. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 ho\u1ea1t \u0111\u1ed9ng b\u00ean trong v\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t, c\u00e1c c\u00e1 nh\u00e2n v\u00e0 t\u1ed5 ch\u1ee9c c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o vi\u1ec7c b\u1ea3o v\u1ec7 th\u00f4ng tin nh\u1ea1y c\u1ea3m c\u1ee7a h\u1ecd trong m\u1ed9t th\u1ebf gi\u1edbi ng\u00e0y c\u00e0ng k\u1ef9 thu\u1eadt s\u1ed1.<\/p>","protected":false},"featured_media":470633,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-479218","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about Symmetric Encryption: Safeguarding Data with Shared Secrets<\/mark>","faq_items":[{"question":"What is symmetric encryption?<\/strong>","answer":"

              Symmetric encryption is a cryptographic technique that uses a single shared secret key to both encrypt and decrypt data. It ensures confidentiality and integrity by converting plaintext into unreadable ciphertext, and vice versa, using the same key.<\/p>"},{"question":"Where did symmetric encryption originate, and when was it first mentioned?<\/strong>","answer":"

              The origins of symmetric encryption date back to ancient times. One of the earliest recorded instances is the Caesar cipher, used by Julius Caesar for military communications. This substitution cipher shifted each letter in the plaintext by a fixed number of positions down the alphabet.<\/p>"},{"question":"How does symmetric encryption work?<\/strong>","answer":"

              Symmetric encryption involves three main components: the encryption algorithm, the secret key, and the plaintext data. The sender applies the algorithm and shared key to the plaintext, producing ciphertext. The receiver, in possession of the same key, decrypts the ciphertext back to the original plaintext.<\/p>"},{"question":"What are the key features of symmetric encryption?<\/strong>","answer":"

              Symmetric encryption boasts several key features, including speed, security (dependent on the strength of the secret key), confidentiality, integrity, and compatibility with standardized algorithms.<\/p>"},{"question":"What types of symmetric encryption exist?<\/strong>","answer":"

              Various types of symmetric encryption algorithms are available, such as:<\/p>

              • Advanced Encryption Standard (AES)<\/li>
              • Data Encryption Standard (DES)<\/li>
              • Triple DES (3DES)<\/li>
              • Rivest Cipher (RC)<\/li>
              • Blowfish<\/li>
              • Twofish<\/li><\/ul>"},{"question":"Where can symmetric encryption be used, and what challenges does it present?<\/strong>","answer":"

                Symmetric encryption finds applications in secure communication, data storage, and authentication. However, challenges include key management, key exchange, and key rotation to maintain security.<\/p>"},{"question":"How does symmetric encryption compare with asymmetric encryption?<\/strong>","answer":"

                Symmetric encryption uses a shared secret key for both encryption and decryption, while asymmetric encryption relies on a pair of keys (public and private). Symmetric encryption is generally faster, but key management can be more challenging.<\/p>"},{"question":"What are the future perspectives of symmetric encryption?<\/strong>","answer":"

                The future of symmetric encryption lies in the development of robust encryption algorithms with a focus on key management and quantum-resistant techniques in the face of evolving technology.<\/p>"},{"question":"How are proxy servers related to symmetric encryption?<\/strong>","answer":"

                Proxy servers can use symmetric encryption to enhance security and privacy by securing data between clients and the server and enforcing secure communication protocols.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/479218","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\/479218\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/470633"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=479218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}