{"id":477432,"date":"2023-08-09T09:14:50","date_gmt":"2023-08-09T09:14:50","guid":{"rendered":""},"modified":"2023-09-05T11:14:42","modified_gmt":"2023-09-05T11:14:42","slug":"hash-value","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/hash-value\/","title":{"rendered":"Gi\u00e1 tr\u1ecb b\u0103m"},"content":{"rendered":"<p>Gi\u00e1 tr\u1ecb b\u0103m, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi \u0111\u01a1n gi\u1ea3n l\u00e0 \u201cb\u0103m\u201d, l\u00e0 bi\u1ec3u di\u1ec5n d\u1eef li\u1ec7u b\u1eb1ng s\u1ed1 ho\u1eb7c ch\u1eef s\u1ed1 c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh. Gi\u00e1 tr\u1ecb n\u00e0y l\u00e0 duy nh\u1ea5t cho d\u1eef li\u1ec7u g\u1ed1c. Gi\u00e1 tr\u1ecb b\u0103m kh\u00f4ng th\u1ec3 thi\u1ebfu trong nhi\u1ec1u kh\u00eda c\u1ea1nh c\u1ee7a \u0111i\u1ec7n to\u00e1n v\u00e0 internet, bao g\u1ed3m b\u1ea3o m\u1eadt m\u1eadt kh\u1ea9u, t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u, ch\u1eef k\u00fd s\u1ed1 v\u00e0 th\u1eadm ch\u00ed l\u00e0 m\u00e3 \u0111\u1ecbnh danh trong c\u1ea5u tr\u00fac d\u1eef li\u1ec7u nh\u01b0 b\u1ea3ng b\u0103m.<\/p>\n<h2>Ngu\u1ed3n g\u1ed1c v\u00e0 s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a gi\u00e1 tr\u1ecb b\u0103m<\/h2>\n<p>Kh\u00e1i ni\u1ec7m b\u0103m b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng n\u0103m 1950 v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a h\u00e0m b\u0103m, m\u1ed9t k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 truy xu\u1ea5t d\u1eef li\u1ec7u nhanh ch\u00f3ng. H\u00e0m b\u0103m \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi Hans Peter Luhn, m\u1ed9t nh\u00e0 khoa h\u1ecdc c\u1ee7a IBM, \u0111\u01b0\u1ee3c c\u1ea5p b\u1eb1ng s\u00e1ng ch\u1ebf v\u00e0o n\u0103m 1953. H\u00e0m b\u0103m v\u00e0 do \u0111\u00f3 c\u00e1c gi\u00e1 tr\u1ecb b\u0103m \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n thi\u1ebft y\u1ebfu c\u1ee7a khoa h\u1ecdc m\u00e1y t\u00ednh, v\u1edbi nhi\u1ec1u h\u00e0m b\u0103m kh\u00e1c nhau \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n qua nhi\u1ec1u n\u0103m cho c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 nh\u01b0 MD5 v\u00e0 SHA-1.<\/p>\n<h2>Gi\u00e1 tr\u1ecb b\u0103m: Gi\u1ea3i n\u00e9n kh\u00e1i ni\u1ec7m<\/h2>\n<p>V\u1ec1 c\u1ed1t l\u00f5i, gi\u00e1 tr\u1ecb b\u0103m l\u00e0 t\u00edch c\u1ee7a h\u00e0m b\u0103m. H\u00e0m b\u0103m l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh nh\u1eadn \u0111\u1ea7u v\u00e0o (ho\u1eb7c &#039;th\u00f4ng b\u00e1o&#039;) v\u00e0 tr\u1ea3 v\u1ec1 m\u1ed9t chu\u1ed7i byte c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh, th\u01b0\u1eddng l\u00e0 gi\u00e1 tr\u1ecb b\u0103m. M\u1ee5c ti\u00eau ch\u00ednh c\u1ee7a h\u00e0m b\u0103m l\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. M\u1ed9t thay \u0111\u1ed5i duy nh\u1ea5t trong d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o, d\u00f9 c\u00f3 v\u1ebb t\u1ea7m th\u01b0\u1eddng, c\u0169ng d\u1eabn \u0111\u1ebfn s\u1ef1 kh\u00e1c bi\u1ec7t \u0111\u00e1ng k\u1ec3 trong k\u1ebft qu\u1ea3 b\u0103m, m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201chi\u1ec7u \u1ee9ng tuy\u1ebft l\u1edf\u201d.<\/p>\n<h2>Ho\u1ea1t \u0111\u1ed9ng b\u00ean trong c\u1ee7a gi\u00e1 tr\u1ecb b\u0103m<\/h2>\n<p>H\u00e0m b\u0103m ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch chuy\u1ec3n \u0111\u1ed5i \u0111\u1ea7u v\u00e0o th\u00e0nh chu\u1ed7i v\u0103n b\u1ea3n b\u1eb1ng thu\u1eadt to\u00e1n. \u0110\u00e2y c\u00f3 th\u1ec3 l\u00e0 b\u1ea5t c\u1ee9 th\u1ee9 g\u00ec t\u1eeb m\u1ed9t k\u00fd t\u1ef1 \u0111\u01a1n l\u1ebb \u0111\u1ebfn to\u00e0n b\u1ed9 cu\u1ed1n s\u00e1ch ho\u1eb7c nhi\u1ec1u h\u01a1n. Gi\u00e1 tr\u1ecb b\u0103m xu\u1ea5t ra s\u1ebd lu\u00f4n c\u00f3 c\u00f9ng \u0111\u1ed9 d\u00e0i, b\u1ea5t k\u1ec3 k\u00edch th\u01b0\u1edbc c\u1ee7a d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o. Khi c\u00f9ng m\u1ed9t \u0111\u1ea7u v\u00e0o \u0111\u01b0\u1ee3c c\u1ea5p cho m\u1ed9t h\u00e0m b\u0103m c\u1ee5 th\u1ec3, n\u00f3 s\u1ebd lu\u00f4n t\u1ea1o ra c\u00f9ng m\u1ed9t gi\u00e1 tr\u1ecb b\u0103m, \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n v\u00e0 \u0111\u1ed9 tin c\u1eady. Tuy nhi\u00ean, l\u00fd t\u01b0\u1edfng nh\u1ea5t l\u00e0 c\u00e1c d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o kh\u00e1c nhau s\u1ebd t\u1ea1o ra c\u00e1c gi\u00e1 tr\u1ecb b\u0103m duy nh\u1ea5t.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a gi\u00e1 tr\u1ecb b\u0103m<\/h2>\n<p>M\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh x\u00e1c \u0111\u1ecbnh gi\u00e1 tr\u1ecb b\u0103m v\u00e0 ch\u1ee9c n\u0103ng c\u1ee7a ch\u00fang:<\/p>\n<ul>\n<li><strong>Ch\u1ee7 ngh\u0129a quy\u1ebft \u0111\u1ecbnh<\/strong>: \u0110\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 \u0111\u1ea7u v\u00e0o nh\u1ea5t \u0111\u1ecbnh n\u00e0o, h\u00e0m b\u0103m s\u1ebd lu\u00f4n t\u1ea1o ra c\u00f9ng m\u1ed9t gi\u00e1 tr\u1ecb b\u0103m.<\/li>\n<li><strong>Chi\u1ec1u d\u00e0i c\u1ed1 \u0111\u1ecbnh<\/strong>: B\u1ea5t k\u1ec3 k\u00edch th\u01b0\u1edbc c\u1ee7a d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o l\u00e0 bao nhi\u00eau, gi\u00e1 tr\u1ecb b\u0103m s\u1ebd lu\u00f4n c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh.<\/li>\n<li><strong>Hi\u1ec7u qu\u1ea3<\/strong>: Vi\u1ec7c t\u00ednh to\u00e1n gi\u00e1 tr\u1ecb b\u0103m cho b\u1ea5t k\u1ef3 d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o n\u00e0o ph\u1ea3i nhanh ch\u00f3ng.<\/li>\n<li><strong>Kh\u00e1ng ti\u1ec1n \u1ea3nh<\/strong>: V\u1ec1 m\u1eb7t t\u00ednh to\u00e1n, vi\u1ec7c \u0111\u1ea3o ng\u01b0\u1ee3c h\u00e0m b\u0103m (t\u1eeb gi\u00e1 tr\u1ecb b\u0103m sang d\u1eef li\u1ec7u g\u1ed1c) l\u00e0 kh\u00f4ng th\u1ec3 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c v\u1ec1 m\u1eb7t t\u00ednh to\u00e1n.<\/li>\n<li><strong>Ch\u1ed1ng va ch\u1ea1m<\/strong>: R\u1ea5t kh\u00f3 \u0111\u1ec3 t\u00ecm th\u1ea5y hai \u0111\u1ea7u v\u00e0o kh\u00e1c nhau t\u1ea1o ra c\u00f9ng m\u1ed9t gi\u00e1 tr\u1ecb b\u0103m.<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i gi\u00e1 tr\u1ecb b\u0103m: C\u00e1c bi\u1ebfn th\u1ec3 \u0111a d\u1ea1ng cho c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau<\/h2>\n<p>C\u00f3 m\u1ed9t s\u1ed1 lo\u1ea1i h\u00e0m b\u0103m, m\u1ed7i lo\u1ea1i t\u1ea1o ra c\u00e1c gi\u00e1 tr\u1ecb b\u0103m duy nh\u1ea5t v\u00e0 m\u1ed7i lo\u1ea1i ph\u00f9 h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t v\u00e0i v\u00ed d\u1ee5:<\/p>\n<ul>\n<li>\n<p><strong>MD5 (Thu\u1eadt to\u00e1n ph\u00e2n lo\u1ea1i tin nh\u1eafn 5)<\/strong>: T\u1ea1o ra gi\u00e1 tr\u1ecb b\u0103m 128 bit, th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp l\u1ee5c ph\u00e2n 32 k\u00fd t\u1ef1. B\u1ea5t ch\u1ea5p s\u1ef1 ph\u1ed5 bi\u1ebfn tr\u01b0\u1edbc \u0111\u00e2y c\u1ee7a n\u00f3, MD5 hi\u1ec7n \u0111\u01b0\u1ee3c coi l\u00e0 \u0111\u00e3 b\u1ecb h\u1ecfng v\u00e0 kh\u00f4ng ph\u00f9 h\u1ee3p \u0111\u1ec3 s\u1eed d\u1ee5ng ti\u1ebfp v\u00ec n\u00f3 d\u1ec5 b\u1ecb va ch\u1ea1m b\u0103m.<\/p>\n<\/li>\n<li>\n<p><strong>SHA (Thu\u1eadt to\u00e1n b\u0103m an to\u00e0n)<\/strong>: M\u1ed9t h\u1ecd h\u00e0m b\u0103m m\u1eadt m\u00e3 t\u1ea1o ra c\u00e1c gi\u00e1 tr\u1ecb b\u0103m c\u00f3 \u0111\u1ed9 d\u00e0i kh\u00e1c nhau. Ch\u00fang bao g\u1ed3m SHA-0, SHA-1, SHA-2 v\u00e0 SHA-3. SHA-1, gi\u1ed1ng nh\u01b0 MD5, kh\u00f4ng c\u00f2n \u0111\u01b0\u1ee3c coi l\u00e0 an to\u00e0n tr\u01b0\u1edbc nh\u1eefng k\u1ebb t\u1ea5n c\u00f4ng \u0111\u01b0\u1ee3c t\u00e0i tr\u1ee3 t\u1ed1t. SHA-2 v\u00e0 SHA-3 l\u00e0 phi\u00ean b\u1ea3n \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t hi\u1ec7n t\u1ea1i.<\/p>\n<\/li>\n<li>\n<p><strong>CRC32 (Ki\u1ec3m tra d\u1ef1 ph\u00f2ng theo chu k\u1ef3)<\/strong>: CRC32 kh\u00f4ng ph\u1ea3i l\u00e0 h\u00e0m b\u0103m m\u1eadt m\u00e3 nh\u01b0ng n\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m tra l\u1ed7i trong m\u1ea1ng v\u00e0 thi\u1ebft b\u1ecb l\u01b0u tr\u1eef.<\/p>\n<\/li>\n<\/ul>\n<h2>S\u1eed d\u1ee5ng th\u1ef1c t\u1ebf, th\u00e1ch th\u1ee9c v\u00e0 gi\u1ea3i ph\u00e1p cho gi\u00e1 tr\u1ecb b\u0103m<\/h2>\n<p>Gi\u00e1 tr\u1ecb b\u0103m t\u00ecm \u1ee9ng d\u1ee5ng trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng:<\/p>\n<ul>\n<li><strong>Ki\u1ec3m tra t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u<\/strong>: Gi\u00e1 tr\u1ecb b\u0103m gi\u00fap x\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u trong qu\u00e1 tr\u00ecnh truy\u1ec1n ho\u1eb7c l\u01b0u tr\u1eef.<\/li>\n<li><strong>L\u01b0u tr\u1eef m\u1eadt kh\u1ea9u<\/strong>: Thay v\u00ec l\u01b0u tr\u1eef m\u1eadt kh\u1ea9u th\u1ef1c t\u1ebf, c\u00e1c trang web v\u00e0 \u1ee9ng d\u1ee5ng l\u01b0u tr\u1eef gi\u00e1 tr\u1ecb b\u0103m c\u1ee7a ch\u00fang v\u00ec l\u00fd do b\u1ea3o m\u1eadt.<\/li>\n<li><strong>Ch\u1eef k\u00fd s\u1ed1<\/strong>: Gi\u00e1 tr\u1ecb b\u0103m l\u00e0 kh\u00f4ng th\u1ec3 thi\u1ebfu trong vi\u1ec7c x\u00e1c minh t\u00ednh x\u00e1c th\u1ef1c c\u1ee7a t\u00e0i li\u1ec7u v\u00e0 tin nh\u1eafn k\u1ef9 thu\u1eadt s\u1ed1.<\/li>\n<\/ul>\n<p>Tuy nhi\u00ean, gi\u00e1 tr\u1ecb b\u0103m kh\u00f4ng ph\u1ea3i l\u00e0 kh\u00f4ng c\u00f3 th\u00e1ch th\u1ee9c:<\/p>\n<ul>\n<li><strong>L\u1ed7 h\u1ed5ng va ch\u1ea1m<\/strong>: N\u1ebfu hai \u0111\u1ea7u v\u00e0o kh\u00e1c nhau t\u1ea1o ra c\u00f9ng m\u1ed9t gi\u00e1 tr\u1ecb b\u0103m th\u00ec \u0111\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 xung \u0111\u1ed9t. Xung \u0111\u1ed9t c\u00f3 th\u1ec3 l\u00e0m t\u1ed5n h\u1ea1i \u0111\u1ebfn t\u00ednh to\u00e0n v\u1eb9n v\u00e0 b\u1ea3o m\u1eadt c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n<li><strong>T\u1ea5n c\u00f4ng ti\u1ec1n \u1ea3nh<\/strong>: N\u1ebfu k\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o d\u1ef1a tr\u00ean gi\u00e1 tr\u1ecb b\u0103m th\u00ec \u0111\u00f3 l\u00e0 cu\u1ed9c t\u1ea5n c\u00f4ng ti\u1ec1n \u1ea3nh. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t nguy hi\u1ec3m cho vi\u1ec7c b\u1ea3o m\u1eadt m\u1eadt kh\u1ea9u.<\/li>\n<\/ul>\n<p>\u0110\u1ec3 v\u01b0\u1ee3t qua nh\u1eefng th\u00e1ch th\u1ee9c n\u00e0y, c\u00e1c h\u00e0m b\u0103m m\u1eadt m\u00e3 hi\u1ec7n \u0111\u1ea1i, ch\u1eb3ng h\u1ea1n nh\u01b0 SHA-256 ho\u1eb7c SHA-3, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng va ch\u1ea1m v\u00e0 t\u1ea5n c\u00f4ng ti\u1ec1n \u1ea3nh.<\/p>\n<h2>Gi\u00e1 tr\u1ecb b\u0103m v\u00e0 c\u00e1c kh\u00e1i ni\u1ec7m c\u00f3 th\u1ec3 so s\u00e1nh: T\u1ed5ng quan so s\u00e1nh<\/h2>\n<p>So s\u00e1nh h\u00e0m b\u0103m v\u1edbi t\u1ed5ng ki\u1ec3m tra ho\u1eb7c kh\u00f3a m\u1eadt m\u00e3 minh h\u1ecda t\u00ednh duy nh\u1ea5t c\u1ee7a h\u00e0m b\u0103m:<\/p>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>H\u00e0m b\u0103m<\/th>\n<th>T\u1ed5ng ki\u1ec3m tra<\/th>\n<th>Kh\u00f3a m\u1eadt m\u00e3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M\u1ee5c \u0111\u00edch<\/td>\n<td>To\u00e0n v\u1eb9n d\u1eef li\u1ec7u, l\u01b0u tr\u1eef m\u1eadt kh\u1ea9u, ch\u1eef k\u00fd s\u1ed1<\/td>\n<td>Ph\u00e1t hi\u1ec7n l\u1ed7i<\/td>\n<td>M\u00e3 h\u00f3a\/Gi\u1ea3i m\u00e3, X\u00e1c th\u1ef1c<\/td>\n<\/tr>\n<tr>\n<td>Ch\u1ed1ng va ch\u1ea1m<\/td>\n<td>C\u00f3 (K\u1ecbch b\u1ea3n l\u00fd t\u01b0\u1edfng)<\/td>\n<td>KH\u00d4NG<\/td>\n<td>Kh\u00f4ng \u00e1p d\u1ee5ng<\/td>\n<\/tr>\n<tr>\n<td>Kh\u00e1ng ti\u1ec1n \u1ea3nh<\/td>\n<td>C\u00f3 (K\u1ecbch b\u1ea3n l\u00fd t\u01b0\u1edfng)<\/td>\n<td>KH\u00d4NG<\/td>\n<td>\u0110\u00fang<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>T\u01b0\u01a1ng lai c\u1ee7a gi\u00e1 tr\u1ecb b\u0103m: Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 m\u1edbi n\u1ed5i<\/h2>\n<p>V\u1edbi nh\u1eefng ti\u1ebfn b\u1ed9 trong \u0111i\u1ec7n to\u00e1n l\u01b0\u1ee3ng t\u1eed, c\u00e1c h\u00e0m b\u0103m truy\u1ec1n th\u1ed1ng c\u00f3 th\u1ec3 tr\u1edf n\u00ean d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng trong t\u01b0\u01a1ng lai. V\u00ec v\u1eady, l\u0129nh v\u1ef1c m\u1eadt m\u00e3 h\u1eadu l\u01b0\u1ee3ng t\u1eed \u0111ang t\u00edch c\u1ef1c nghi\u00ean c\u1ee9u c\u00e1c h\u00e0m b\u0103m c\u00f3 th\u1ec3 ch\u1ed1ng l\u1ea1i c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng l\u01b0\u1ee3ng t\u1eed. Ngo\u00e0i ra, c\u00e1c h\u00e0m b\u0103m \u0111ang \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n h\u01a1n nh\u1eb1m \u0111\u00e1p \u1ee9ng nhu c\u1ea7u ng\u00e0y c\u00e0ng t\u0103ng v\u1ec1 d\u1eef li\u1ec7u v\u00e0 b\u1ea3o m\u1eadt trong c\u00e1c c\u00f4ng ngh\u1ec7 m\u1edbi n\u1ed5i nh\u01b0 blockchain v\u00e0 IoT.<\/p>\n<h2>M\u00e1y ch\u1ee7 proxy v\u00e0 gi\u00e1 tr\u1ecb b\u0103m: S\u1ef1 t\u01b0\u01a1ng t\u00e1c<\/h2>\n<p>Trong b\u1ed1i c\u1ea3nh m\u00e1y ch\u1ee7 proxy, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u00e1y ch\u1ee7 do OneProxy cung c\u1ea5p, gi\u00e1 tr\u1ecb b\u0103m c\u00f3 th\u1ec3 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n v\u00e0 quy\u1ec1n ri\u00eang t\u01b0 c\u1ee7a d\u1eef li\u1ec7u. V\u00ed d\u1ee5: khi ng\u01b0\u1eddi d\u00f9ng t\u1ef1 x\u00e1c th\u1ef1c tr\u00ean m\u00e1y ch\u1ee7 proxy, m\u1eadt kh\u1ea9u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef v\u00e0 x\u00e1c minh b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng gi\u00e1 tr\u1ecb b\u0103m thay v\u00ec m\u1eadt kh\u1ea9u th\u1ef1c t\u1ebf \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt.<\/p>\n<p>H\u01a1n n\u1eefa, khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n qua proxy, gi\u00e1 tr\u1ecb b\u0103m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u kh\u00f4ng b\u1ecb gi\u1ea3 m\u1ea1o trong qu\u00e1 tr\u00ecnh truy\u1ec1n. Ng\u01b0\u1eddi g\u1eedi t\u00ednh to\u00e1n gi\u00e1 tr\u1ecb b\u0103m c\u1ee7a d\u1eef li\u1ec7u v\u00e0 g\u1eedi n\u00f3 c\u00f9ng v\u1edbi d\u1eef li\u1ec7u. Sau \u0111\u00f3, ng\u01b0\u1eddi nh\u1eadn c\u00f3 th\u1ec3 t\u00ednh to\u00e1n h\u00e0m b\u0103m c\u1ee7a d\u1eef li\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c v\u00e0 so s\u00e1nh n\u00f3 v\u1edbi gi\u00e1 tr\u1ecb b\u0103m nh\u1eadn \u0111\u01b0\u1ee3c \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 gi\u00e1 tr\u1ecb b\u0103m, n\u00ean s\u1eed d\u1ee5ng c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=b4b8ktEV4Bg\" target=\"_new\" rel=\"noopener nofollow\">Video c\u1ee7a Computerphile v\u1ec1 Hashing<\/a><\/li>\n<li><a href=\"https:\/\/csrc.nist.gov\/publications\/detail\/sp\/800-107\/rev-1\/final\" target=\"_new\" rel=\"noopener nofollow\">Nguy\u00ean t\u1eafc b\u0103m m\u1eadt m\u00e3 c\u1ee7a NIST<\/a><\/li>\n<li><a href=\"https:\/\/www.khanacademy.org\/computing\/computer-science\/cryptography\" target=\"_new\" rel=\"noopener nofollow\">Kh\u00f3a h\u1ecdc v\u1ec1 M\u1eadt m\u00e3 h\u1ecdc c\u1ee7a Khan Academy<\/a><\/li>\n<li><a href=\"https:\/\/tools.ietf.org\/html\/rfc6151\" target=\"_new\" rel=\"noopener nofollow\">RFC 6151 \u2013 C\u1eadp nh\u1eadt c\u00e1c c\u00e2n nh\u1eafc v\u1ec1 b\u1ea3o m\u1eadt cho Thu\u1eadt to\u00e1n ph\u00e2n lo\u1ea1i th\u00f4ng b\u00e1o MD5 v\u00e0 HMAC-MD5<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hash_function\" target=\"_new\" rel=\"noopener nofollow\">Trang Wikipedia v\u1ec1 H\u00e0m b\u0103m<\/a><\/li>\n<\/ol>","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477432","wiki","type-wiki","status-publish","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Hash Values: The Heart of Data Integrity and Verification<\/mark>","faq_items":[{"question":"What is a Hash Value?","answer":"<p>A hash value is a fixed-size numerical or alphanumeric representation of data, which is unique to the original data. Hash values play a crucial role in computing and internet processes, such as password security, data integrity, digital signatures, and even as identifiers in hash tables.<\/p>"},{"question":"What is the History of Hash Values?","answer":"<p>The concept of hashing originated in the 1950s with the development of the hash function, a technique used for swift data retrieval. The first hash function was patented in 1953 by Hans Peter Luhn, an IBM scientist. Over the years, various hash functions have been developed for different applications, leading to different types of hash values.<\/p>"},{"question":"How Does a Hash Function Work?","answer":"<p>A hash function takes an input (or 'message') and returns a fixed-size string of bytes, typically a hash value. The outputted hash value will always be the same length, regardless of the size of the input data. When the same input is given to a specific hash function, it will always produce the same hash value, ensuring consistency and reliability.<\/p>"},{"question":"What are the Key Features of Hash Values?","answer":"<p>The key features of hash values include determinism, fixed length, efficiency, preimage resistance, and collision resistance. They should ideally be quick to compute, and it should be computationally infeasible to reverse a hash function or to find two different inputs that produce the same hash value.<\/p>"},{"question":"What are the Different Types of Hash Functions?","answer":"<p>There are several types of hash functions, each producing unique hash values. Examples include MD5, which produces a 128-bit hash value, and the SHA family of cryptographic hash functions that produce hash values of different lengths.<\/p>"},{"question":"What are the Practical Uses of Hash Values?","answer":"<p>Hash values are used to verify the integrity of data during transfer or storage, for password storage on websites and applications, and in the verification of the authenticity of digital documents and messages.<\/p>"},{"question":"What are the Challenges and Solutions Related to Hash Values?","answer":"<p>Challenges related to hash values include collision vulnerability, where two different inputs produce the same hash value, and preimage attacks, where an attacker can determine the input data based on a hash value. Modern cryptographic hash functions, such as SHA-256 or SHA-3, are designed to be resistant to these challenges.<\/p>"},{"question":"How are Proxy Servers Related to Hash Values?","answer":"<p>In the context of proxy servers, hash values can maintain the integrity and privacy of data. For instance, during user authentication on a proxy server, the passwords can be stored and verified using hash values. Also, when data is transferred via a proxy, a hash value can be used to ensure that the data has not been tampered with during transit.<\/p>"},{"question":"What are the Future Perspectives and Emerging Technologies Related to Hash Values?","answer":"<p>With advancements in quantum computing and other technologies like blockchain and IoT, new hash functions are being developed to be more efficient and secure. The field of post-quantum cryptography is also actively researching hash functions that can withstand quantum attacks.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477432","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\/477432\/revisions"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}