{"id":476496,"date":"2023-08-09T07:29:55","date_gmt":"2023-08-09T07:29:55","guid":{"rendered":""},"modified":"2023-09-05T11:12:52","modified_gmt":"2023-09-05T11:12:52","slug":"cryptographic-hash-function","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/cryptographic-hash-function\/","title":{"rendered":"H\u00e0m b\u0103m m\u1eadt m\u00e3"},"content":{"rendered":"

Gi\u1edbi thi\u1ec7u<\/h2>\n

H\u00e0m b\u0103m m\u1eadt m\u00e3 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong khoa h\u1ecdc m\u00e1y t\u00ednh hi\u1ec7n \u0111\u1ea1i v\u00e0 b\u1ea3o m\u1eadt th\u00f4ng tin. C\u00e1c thu\u1eadt to\u00e1n to\u00e1n h\u1ecdc n\u00e0y \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n, x\u00e1c th\u1ef1c v\u00e0 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u tr\u00ean nhi\u1ec1u \u1ee9ng d\u1ee5ng v\u00e0 ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c nhau. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 l\u1ecbch s\u1eed, ho\u1ea1t \u0111\u1ed9ng b\u00ean trong, lo\u1ea1i, c\u00e1ch s\u1eed d\u1ee5ng v\u00e0 quan \u0111i\u1ec3m trong t\u01b0\u01a1ng lai c\u1ee7a h\u00e0m b\u0103m m\u1eadt m\u00e3.<\/p>\n

L\u1ecbch s\u1eed v\u00e0 ngu\u1ed3n g\u1ed1c<\/h2>\n

Kh\u00e1i ni\u1ec7m b\u0103m c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb \u0111\u1ea7u nh\u1eefng n\u0103m 1950 khi nh\u00e0 m\u1eadt m\u00e3 h\u1ecdc ng\u01b0\u1eddi M\u1ef9 David Kahn \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3 trong c\u00f4ng tr\u00ecnh v\u1ec1 m\u1eadt m\u00e3 h\u1ecdc c\u1ee7a \u00f4ng. Tuy nhi\u00ean, l\u1ea7n \u0111\u1ea7u ti\u00ean h\u00e0m b\u0103m m\u1eadt m\u00e3 hi\u1ec7n \u0111\u1ea1i \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn l\u00e0 v\u00e0o cu\u1ed1i nh\u1eefng n\u0103m 1970 khi Ronald Rivest \u0111\u1ec1 xu\u1ea5t thu\u1eadt to\u00e1n MD4 (Message Digest 4). Sau \u0111\u00f3, MD5 (Message Digest 5) v\u00e0 SHA-1 (Thu\u1eadt to\u00e1n b\u0103m an to\u00e0n 1) \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n v\u00e0o nh\u1eefng n\u0103m 1990, th\u00fac \u0111\u1ea9y h\u01a1n n\u1eefa l\u0129nh v\u1ef1c h\u00e0m b\u0103m m\u1eadt m\u00e3.<\/p>\n

Th\u00f4ng tin chi ti\u1ebft v\u1ec1 h\u00e0m b\u0103m m\u1eadt m\u00e3<\/h2>\n

H\u00e0m b\u0103m m\u1eadt m\u00e3 l\u00e0 h\u00e0m m\u1ed9t chi\u1ec1u nh\u1eadn \u0111\u1ea7u v\u00e0o (ho\u1eb7c th\u00f4ng b\u00e1o) c\u00f3 \u0111\u1ed9 d\u00e0i t\u00f9y \u00fd v\u00e0 t\u1ea1o ra \u0111\u1ea7u ra c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 gi\u00e1 tr\u1ecb b\u0103m ho\u1eb7c th\u00f4ng b\u00e1o. \u0110\u1ea7u ra n\u00e0y, th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp l\u1ee5c ph\u00e2n, \u0111\u00f3ng vai tr\u00f2 l\u00e0 m\u00e3 \u0111\u1ecbnh danh duy nh\u1ea5t cho d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o. C\u00e1c thu\u1ed9c t\u00ednh ch\u00ednh c\u1ee7a h\u00e0m b\u0103m m\u1eadt m\u00e3 l\u00e0:<\/p>\n

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  1. x\u00e1c \u0111\u1ecbnh<\/strong>: V\u1edbi c\u00f9ng m\u1ed9t \u0111\u1ea7u v\u00e0o, h\u00e0m b\u0103m s\u1ebd lu\u00f4n t\u1ea1o ra c\u00f9ng m\u1ed9t \u0111\u1ea7u ra.<\/li>\n
  2. T\u00ednh to\u00e1n nhanh<\/strong>: H\u00e0m b\u0103m ph\u1ea3i t\u1ea1o ra gi\u00e1 tr\u1ecb b\u0103m m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 cho b\u1ea5t k\u1ef3 \u0111\u1ea7u v\u00e0o nh\u1ea5t \u0111\u1ecbnh n\u00e0o.<\/li>\n
  3. Kh\u00e1ng tr\u01b0\u1edbc h\u00ecnh \u1ea3nh<\/strong>: V\u1edbi m\u1ed9t gi\u00e1 tr\u1ecb b\u0103m, s\u1ebd kh\u00f4ng th\u1ec3 t\u00ednh to\u00e1n \u0111\u01b0\u1ee3c \u0111\u1ec3 t\u00ecm \u0111\u1ea7u v\u00e0o ban \u0111\u1ea7u.<\/li>\n
  4. Ch\u1ed1ng va ch\u1ea1m<\/strong>: R\u1ea5t kh\u00f3 c\u00f3 kh\u1ea3 n\u0103ng hai \u0111\u1ea7u v\u00e0o kh\u00e1c nhau t\u1ea1o ra c\u00f9ng m\u1ed9t gi\u00e1 tr\u1ecb b\u0103m.<\/li>\n
  5. Hi\u1ec7u \u1ee9ng tuy\u1ebft l\u1edf<\/strong>: M\u1ed9t thay \u0111\u1ed5i nh\u1ecf trong \u0111\u1ea7u v\u00e0o s\u1ebd d\u1eabn \u0111\u1ebfn gi\u00e1 tr\u1ecb b\u0103m kh\u00e1c bi\u1ec7t \u0111\u00e1ng k\u1ec3.<\/li>\n<\/ol>\n

    C\u01a1 c\u1ea5u n\u1ed9i b\u1ed9 v\u00e0 nguy\u00ean t\u1eafc l\u00e0m vi\u1ec7c<\/h2>\n

    C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a h\u00e0m b\u0103m m\u1eadt m\u00e3 th\u01b0\u1eddng bao g\u1ed3m m\u1ed9t lo\u1ea1t c\u00e1c ph\u00e9p to\u00e1n, ch\u1eb3ng h\u1ea1n nh\u01b0 s\u1ed1 h\u1ecdc m\u00f4-\u0111un, ph\u00e9p to\u00e1n theo bit v\u00e0 h\u00e0m logic. Qu\u00e1 tr\u00ecnh n\u00e0y bao g\u1ed3m vi\u1ec7c chia d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o th\u00e0nh c\u00e1c kh\u1ed1i v\u00e0 x\u1eed l\u00fd ch\u00fang l\u1eb7p \u0111i l\u1eb7p l\u1ea1i. \u0110\u1ea7u ra cu\u1ed1i c\u00f9ng l\u00e0 m\u1ed9t b\u1ea3n t\u00f3m t\u1eaft c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh \u0111\u1ea1i di\u1ec7n cho to\u00e0n b\u1ed9 \u0111\u1ea7u v\u00e0o.<\/p>\n

    D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t ph\u00e1c th\u1ea3o \u0111\u01a1n gi\u1ea3n v\u1ec1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a h\u00e0m b\u0103m m\u1eadt m\u00e3:<\/p>\n

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    1. S\u01a1 ch\u1ebf<\/strong>: Ph\u1ea7n \u0111\u1ec7m \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o n\u00f3 \u0111\u00e1p \u1ee9ng k\u00edch th\u01b0\u1edbc kh\u1ed1i \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u.<\/li>\n
    2. Gi\u00e1 tr\u1ecb ban \u0111\u1ea7u<\/strong>: M\u1ed9t t\u1eadp h\u1ee3p c\u00e1c gi\u00e1 tr\u1ecb ban \u0111\u1ea7u, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 vect\u01a1 kh\u1edfi t\u1ea1o (IV), \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh.<\/li>\n
    3. Ch\u1ee9c n\u0103ng n\u00e9n<\/strong>: C\u1ed1t l\u00f5i c\u1ee7a h\u00e0m b\u0103m, n\u00f3 x\u1eed l\u00fd t\u1eebng kh\u1ed1i v\u00e0 c\u1eadp nh\u1eadt gi\u00e1 tr\u1ecb b\u0103m trung gian.<\/li>\n
    4. Quy\u1ebft to\u00e1n<\/strong>: Kh\u1ed1i cu\u1ed1i c\u00f9ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd v\u00e0 gi\u00e1 tr\u1ecb b\u0103m \u0111\u01b0\u1ee3c xu\u1ea5t ra.<\/li>\n<\/ol>\n

      C\u00e1c lo\u1ea1i h\u00e0m b\u0103m m\u1eadt m\u00e3<\/h2>\n

      C\u00e1c h\u00e0m b\u0103m m\u1eadt m\u00e3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean k\u00edch th\u01b0\u1edbc \u0111\u1ea7u ra c\u1ee7a ch\u00fang. M\u1ed9t s\u1ed1 lo\u1ea1i ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n\n\n\n\n\n\n\n\n
      H\u00e0m b\u0103m<\/th>\nK\u00edch th\u01b0\u1edbc \u0111\u1ea7u ra (t\u00ednh b\u1eb1ng bit)<\/th>\n<\/tr>\n<\/thead>\n
      MD5<\/td>\n128<\/td>\n<\/tr>\n
      SHA-1<\/td>\n160<\/td>\n<\/tr>\n
      SHA-256<\/td>\n256<\/td>\n<\/tr>\n
      SHA-512<\/td>\n512<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng h\u00e0m b\u0103m m\u1eadt m\u00e3<\/h2>\n

      C\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a h\u00e0m b\u0103m m\u1eadt m\u00e3 r\u1ea5t \u0111a d\u1ea1ng v\u00e0 s\u00e2u r\u1ed9ng. M\u1ed9t s\u1ed1 c\u00e1ch s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n

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      1. \n

        To\u00e0n v\u1eb9n d\u1eef li\u1ec7u<\/strong>: B\u0103m \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u kh\u00f4ng thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh truy\u1ec1n ho\u1eb7c l\u01b0u tr\u1eef. B\u1eb1ng c\u00e1ch so s\u00e1nh c\u00e1c gi\u00e1 tr\u1ecb b\u0103m tr\u01b0\u1edbc v\u00e0 sau khi chuy\u1ec3n, ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n b\u1ea5t k\u1ef3 thay \u0111\u1ed5i n\u00e0o.<\/p>\n<\/li>\n

      2. \n

        L\u01b0u tr\u1eef m\u1eadt kh\u1ea9u<\/strong>: H\u00e0m b\u0103m l\u01b0u tr\u1eef an to\u00e0n m\u1eadt kh\u1ea9u ng\u01b0\u1eddi d\u00f9ng trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. Khi ng\u01b0\u1eddi d\u00f9ng \u0111\u0103ng nh\u1eadp, m\u1eadt kh\u1ea9u c\u1ee7a h\u1ecd s\u1ebd \u0111\u01b0\u1ee3c b\u0103m v\u00e0 so s\u00e1nh v\u1edbi h\u00e0m b\u0103m \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef.<\/p>\n<\/li>\n

      3. \n

        Ch\u1eef k\u00fd s\u1ed1<\/strong>: H\u00e0m b\u0103m l\u00e0 m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong vi\u1ec7c t\u1ea1o v\u00e0 x\u00e1c minh ch\u1eef k\u00fd s\u1ed1, mang l\u1ea1i t\u00ednh x\u00e1c th\u1ef1c v\u00e0 ch\u1ed1ng ch\u1ed1i b\u1ecf trong truy\u1ec1n th\u00f4ng.<\/p>\n<\/li>\n

      4. \n

        X\u00e1c th\u1ef1c ch\u1ee9ng ch\u1ec9<\/strong>: Trong C\u01a1 s\u1edf h\u1ea1 t\u1ea7ng kh\u00f3a c\u00f4ng khai (PKI), ch\u1ee9ng ch\u1ec9 \u0111\u01b0\u1ee3c k\u00fd b\u1eb1ng h\u00e0m b\u0103m \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh x\u00e1c th\u1ef1c c\u1ee7a ch\u00fang.<\/p>\n<\/li>\n<\/ol>\n

        V\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p<\/h2>\n

        M\u1eb7c d\u00f9 h\u00e0m b\u0103m m\u1eadt m\u00e3 l\u00e0 c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd nh\u01b0ng m\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c nh\u1ea5t \u0111\u1ecbnh c\u00f3 th\u1ec3 n\u1ea3y sinh:<\/p>\n

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        1. \n

          L\u1ed7 h\u1ed5ng<\/strong>: C\u00e1c h\u00e0m b\u0103m c\u0169 h\u01a1n nh\u01b0 MD5 v\u00e0 SHA-1 \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n l\u00e0 d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng va ch\u1ea1m.<\/p>\n<\/li>\n

        2. \n

          T\u1ea5n c\u00f4ng v\u0169 phu<\/strong>: Khi s\u1ee9c m\u1ea1nh t\u00ednh to\u00e1n t\u0103ng l\u00ean, c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng v\u0169 phu tr\u00ean \u0111\u1ed9 d\u00e0i b\u0103m ng\u1eafn h\u01a1n tr\u1edf n\u00ean kh\u1ea3 thi h\u01a1n.<\/p>\n<\/li>\n<\/ol>\n

          \u0110\u1ec3 gi\u1ea3i quy\u1ebft nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y, b\u1ea1n n\u00ean s\u1eed d\u1ee5ng c\u00e1c h\u00e0m b\u0103m m\u1edbi h\u01a1n v\u00e0 m\u1ea1nh m\u1ebd h\u01a1n nh\u01b0 SHA-256 v\u00e0 SHA-512.<\/p>\n

          Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 t\u01b0\u01a1ng lai<\/h2>\n

          T\u01b0\u01a1ng lai c\u1ee7a h\u00e0m b\u0103m m\u1eadt m\u00e3 n\u1eb1m \u1edf nh\u1eefng ti\u1ebfn b\u1ed9 nh\u01b0 m\u1eadt m\u00e3 h\u1eadu l\u01b0\u1ee3ng t\u1eed, nh\u1eb1m m\u1ee5c \u0111\u00edch ph\u00e1t tri\u1ec3n c\u00e1c thu\u1eadt to\u00e1n ch\u1ed1ng l\u1ea1i c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng \u0111i\u1ec7n to\u00e1n l\u01b0\u1ee3ng t\u1eed. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111ang t\u00edch c\u1ef1c kh\u00e1m ph\u00e1 c\u00e1c s\u01a1 \u0111\u1ed3 ch\u1eef k\u00fd d\u1ef1a tr\u00ean h\u00e0m b\u0103m v\u00e0 c\u00e1c gi\u1ea3i ph\u00e1p m\u1eadt m\u00e3 h\u1eadu l\u01b0\u1ee3ng t\u1eed kh\u00e1c.<\/p>\n

          H\u00e0m b\u0103m m\u1eadt m\u00e3 v\u00e0 m\u00e1y ch\u1ee7 proxy<\/h2>\n

          C\u00e1c m\u00e1y ch\u1ee7 proxy, gi\u1ed1ng nh\u01b0 c\u00e1c m\u00e1y ch\u1ee7 do OneProxy cung c\u1ea5p, c\u00f3 th\u1ec3 t\u1eadn d\u1ee5ng c\u00e1c h\u00e0m b\u0103m m\u1eadt m\u00e3 \u0111\u1ec3 n\u00e2ng cao t\u00ednh b\u1ea3o m\u1eadt v\u00e0 quy\u1ec1n ri\u00eang t\u01b0. Khi s\u1eed d\u1ee5ng proxy, t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u tr\u1edf n\u00ean quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng th\u00f4ng tin kh\u00f4ng b\u1ecb thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh truy\u1ec1n. B\u1eb1ng c\u00e1ch tri\u1ec3n khai c\u00e1c h\u00e0m b\u0103m, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 x\u00e1c minh t\u00ednh x\u00e1c th\u1ef1c c\u1ee7a d\u1eef li\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng qua proxy.<\/p>\n

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

          \u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 h\u00e0m b\u0103m m\u1eadt m\u00e3, b\u1ea1n c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n

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          1. \n

            \u1ea4n ph\u1ea9m \u0111\u1eb7c bi\u1ec7t c\u1ee7a NIST 800-107<\/a>: Cung c\u1ea5p h\u01b0\u1edbng d\u1eabn \u0111\u1ec3 ch\u1ecdn h\u00e0m b\u0103m th\u00edch h\u1ee3p.<\/p>\n<\/li>\n

          2. \n

            RFC 6151<\/a>: M\u00f4 t\u1ea3 c\u00e1c y\u00eau c\u1ea7u b\u1ea3o m\u1eadt cho h\u00e0m b\u0103m m\u1eadt m\u00e3.<\/p>\n<\/li>\n

          3. \n

            H\u00e0m b\u0103m tr\u00ean Wikipedia<\/a>: B\u00e0i vi\u1ebft to\u00e0n di\u1ec7n c\u1ee7a Wikipedia v\u1ec1 h\u00e0m b\u0103m m\u1eadt m\u00e3.<\/p>\n<\/li>\n<\/ol>\n

            Ph\u1ea7n k\u1ebft lu\u1eadn<\/h2>\n

            H\u00e0m b\u0103m m\u1eadt m\u00e3 l\u00e0 c\u00f4ng c\u1ee5 kh\u00f4ng th\u1ec3 thi\u1ebfu trong b\u1ea3o m\u1eadt th\u00f4ng tin hi\u1ec7n \u0111\u1ea1i. H\u1ecd cung c\u1ea5p t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u, x\u00e1c th\u1ef1c v\u00e0 b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i c\u00e1c m\u1ed1i \u0111e d\u1ecda m\u1ea1ng kh\u00e1c nhau. Khi c\u00f4ng ngh\u1ec7 ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, c\u00e1c h\u00e0m b\u0103m m\u1eadt m\u00e3 s\u1ebd v\u1eabn \u0111i \u0111\u1ea7u trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o qu\u1ea3n l\u00fd d\u1eef li\u1ec7u v\u00e0 truy\u1ec1n th\u00f4ng an to\u00e0n v\u00e0 \u0111\u00e1ng tin c\u1eady.<\/p>","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476496","wiki","type-wiki","status-publish","hentry"],"acf":{"faq_title":"Frequently Asked Questions about Cryptographic Hash Function: Safeguarding Data Integrity and Security<\/mark>","faq_items":[{"question":"What is a cryptographic hash function?","answer":"

            A cryptographic hash function is a mathematical algorithm that takes an input (or message) of any length and produces a fixed-size output, known as the hash value or digest. It plays a vital role in ensuring data integrity, security, and authentication across various applications and industries.<\/p>"},{"question":"How did cryptographic hash functions originate?","answer":"

            The concept of hashing dates back to the early 1950s, but the first modern cryptographic hash function, MD4, was proposed by Ronald Rivest in the late 1970s. Subsequently, MD5 and SHA-1 further advanced the field in the 1990s.<\/p>"},{"question":"How do cryptographic hash functions work?","answer":"

            Cryptographic hash functions employ a series of mathematical operations to process input data in blocks and generate a fixed-size hash value. The process involves pre-processing, compression, and finalization stages to produce the output.<\/p>"},{"question":"What are the key features of cryptographic hash functions?","answer":"

            The key features include being deterministic, quickly computable, pre-image resistant (difficult to reverse), collision-resistant (highly improbable to have the same output for different inputs), and exhibiting the avalanche effect (small input changes significantly affect the output).<\/p>"},{"question":"What types of cryptographic hash functions exist?","answer":"

            Common types include MD5, SHA-1, SHA-256, and SHA-512, with different output sizes (in bits) such as 128, 160, 256, and 512, respectively.<\/p>"},{"question":"How are cryptographic hash functions used?","answer":"

            Cryptographic hash functions have versatile applications, including ensuring data integrity, securely storing passwords, generating and verifying digital signatures, and validating certificates in Public Key Infrastructure (PKI).<\/p>"},{"question":"What problems can arise with cryptographic hash functions?","answer":"

            Older hash functions like MD5 and SHA-1 have been found to be vulnerable to collision attacks, and as computing power increases, brute force attacks on shorter hash lengths become more feasible. To address these issues, it is recommended to use newer and more robust hash functions like SHA-256 and SHA-512.<\/p>"},{"question":"What are the future perspectives of cryptographic hash functions?","answer":"

            The future of cryptographic hash functions lies in advancements like post-quantum cryptography, aiming to develop algorithms resistant to quantum computing attacks. Researchers are exploring hash-based signature schemes and other post-quantum cryptographic solutions.<\/p>"},{"question":"How are proxy servers associated with cryptographic hash functions?","answer":"

            Proxy servers, like those provided by OneProxy, can utilize cryptographic hash functions for enhanced security and data integrity. By implementing hash functions, users can verify the authenticity of data received through proxies, ensuring a trustworthy communication experience.<\/p>"},{"question":"Where can I find more information about cryptographic hash functions?","answer":"

            For further information, you can explore the resources listed below:<\/p>

            1. NIST Special Publication 800-107<\/a>: Provides guidelines for selecting appropriate hash functions.<\/p><\/li>

            2. RFC 6151<\/a>: Describes the security requirements for cryptographic hash functions.<\/p><\/li>

            3. Hash Functions on Wikipedia<\/a>: Wikipedia's comprehensive article on cryptographic hash functions.<\/p><\/li><\/ol>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476496","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\/476496\/revisions"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}