{"id":476217,"date":"2023-08-09T07:26:52","date_gmt":"2023-08-09T07:26:52","guid":{"rendered":""},"modified":"2023-09-05T11:12:16","modified_gmt":"2023-09-05T11:12:16","slug":"checksum","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/checksum\/","title":{"rendered":"T\u1ed5ng ki\u1ec3m tra"},"content":{"rendered":"<p>T\u1ed5ng ki\u1ec3m tra l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong khoa h\u1ecdc m\u00e1y t\u00ednh v\u00e0 x\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. \u0110\u00f3 l\u00e0 m\u1ed9t gi\u00e1 tr\u1ecb s\u1ed1 \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb m\u1ed9t t\u1eadp h\u1ee3p d\u1eef li\u1ec7u, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n l\u1ed7i v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u trong qu\u00e1 tr\u00ecnh truy\u1ec1n v\u00e0 l\u01b0u tr\u1eef. B\u1eb1ng c\u00e1ch so s\u00e1nh t\u1ed5ng ki\u1ec3m tra \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n v\u1edbi gi\u00e1 tr\u1ecb mong \u0111\u1ee3i, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 x\u00e1c minh xem d\u1eef li\u1ec7u c\u00f3 b\u1ecb thay \u0111\u1ed5i ho\u1eb7c b\u1ecb h\u1ecfng hay kh\u00f4ng.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a t\u1ed5ng ki\u1ec3m tra v\u00e0 s\u1ef1 \u0111\u1ec1 c\u1eadp \u0111\u1ea7u ti\u00ean v\u1ec1 n\u00f3<\/h2>\n<p>Kh\u00e1i ni\u1ec7m t\u1ed5ng ki\u1ec3m tra c\u00f3 t\u1eeb nh\u1eefng ng\u00e0y \u0111\u1ea7u c\u1ee7a m\u00e1y t\u00ednh khi l\u1ed7i d\u1eef li\u1ec7u c\u00f2n ph\u1ed5 bi\u1ebfn do h\u1ea1n ch\u1ebf v\u1ec1 ph\u1ea7n c\u1ee9ng v\u00e0 c\u00e1c k\u00eanh li\u00ean l\u1ea1c kh\u00f4ng \u1ed5n \u0111\u1ecbnh. Vi\u1ec7c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn t\u1ed5ng ki\u1ec3m tra l\u1ea7n \u0111\u1ea7u ti\u00ean c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng n\u0103m 1940 khi ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u00e1y t\u00ednh \u0111\u1eddi \u0111\u1ea7u nh\u01b0 Harvard Mark I. Khi giao ti\u1ebfp d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt s\u1ed1 tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn h\u01a1n, thu\u1eadt to\u00e1n t\u1ed5ng ki\u1ec3m tra \u0111\u00e3 tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn trong nh\u1eefng n\u0103m 1960 v\u00e0 1970.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 t\u1ed5ng ki\u1ec3m tra<\/h2>\n<p>T\u1ed5ng ki\u1ec3m tra l\u00e0 m\u1ed9t gi\u00e1 tr\u1ecb s\u1ed1 c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb d\u1eef li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u1ec7p ho\u1eb7c g\u00f3i m\u1ea1ng. N\u00f3 \u0111\u01b0\u1ee3c t\u1ea1o b\u1eb1ng thu\u1eadt to\u00e1n t\u1ed5ng ki\u1ec3m tra, \u00e1p d\u1ee5ng h\u00e0m to\u00e1n h\u1ecdc cho d\u1eef li\u1ec7u \u0111\u1ec3 t\u1ea1o ra gi\u00e1 tr\u1ecb t\u1ed5ng ki\u1ec3m tra. M\u1ee5c \u0111\u00edch ch\u00ednh c\u1ee7a t\u1ed5ng ki\u1ec3m tra l\u00e0 ph\u00e1t hi\u1ec7n l\u1ed7i, cho d\u00f9 ch\u00fang l\u00e0 v\u00f4 t\u00ecnh hay c\u1ed1 \u00fd.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a t\u1ed5ng ki\u1ec3m tra v\u00e0 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng<\/h2>\n<p>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a t\u1ed5ng ki\u1ec3m tra ph\u1ee5 thu\u1ed9c v\u00e0o thu\u1eadt to\u00e1n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra n\u00f3. Ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn nh\u1ea5t li\u00ean quan \u0111\u1ebfn vi\u1ec7c x\u1eed l\u00fd d\u1eef li\u1ec7u d\u01b0\u1edbi d\u1ea1ng m\u1ed9t chu\u1ed7i c\u00e1c ch\u1eef s\u1ed1 nh\u1ecb ph\u00e2n v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p to\u00e1n tr\u00ean c\u00e1c bit n\u00e0y. M\u1ed9t thu\u1eadt to\u00e1n t\u1ed5ng ki\u1ec3m tra ph\u1ed5 bi\u1ebfn l\u00e0 Ki\u1ec3m tra d\u1ef1 ph\u00f2ng theo chu k\u1ef3 (CRC), chia d\u1eef li\u1ec7u cho m\u1ed9t \u01b0\u1edbc s\u1ed1 c\u1ed1 \u0111\u1ecbnh v\u00e0 gi\u1eef l\u1ea1i ph\u1ea7n c\u00f2n l\u1ea1i l\u00e0m t\u1ed5ng ki\u1ec3m tra.<\/p>\n<p>Khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n ho\u1eb7c l\u01b0u tr\u1eef, c\u1ea3 ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn \u0111\u1ec1u t\u00ednh to\u00e1n t\u1ed5ng ki\u1ec3m tra. Ng\u01b0\u1eddi g\u1eedi th\u00eam t\u1ed5ng ki\u1ec3m tra v\u00e0o g\u00f3i d\u1eef li\u1ec7u v\u00e0 ng\u01b0\u1eddi nh\u1eadn th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh t\u1ed5ng ki\u1ec3m tra t\u01b0\u01a1ng t\u1ef1 tr\u00ean d\u1eef li\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c. N\u1ebfu t\u1ed5ng ki\u1ec3m tra \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n kh\u1edbp v\u1edbi t\u1ed5ng ki\u1ec3m tra nh\u1eadn \u0111\u01b0\u1ee3c, \u0111i\u1ec1u \u0111\u00f3 cho th\u1ea5y d\u1eef li\u1ec7u v\u1eabn c\u00f2n nguy\u00ean. B\u1ea5t k\u1ef3 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0o gi\u1eefa hai t\u1ed5ng ki\u1ec3m tra \u0111\u1ec1u cho th\u1ea5y d\u1eef li\u1ec7u b\u1ecb h\u1ecfng ho\u1eb7c s\u1eeda \u0111\u1ed5i.<\/p>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a t\u1ed5ng ki\u1ec3m tra<\/h2>\n<p>T\u1ed5ng ki\u1ec3m tra c\u00f3 m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh gi\u00fap ch\u00fang c\u00f3 gi\u00e1 tr\u1ecb trong vi\u1ec7c x\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u:<\/p>\n<ol>\n<li>\n<p><strong>Ph\u00e1t hi\u1ec7n l\u1ed7i:<\/strong> T\u1ed5ng ki\u1ec3m tra c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n l\u1ed7i m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a d\u1eef li\u1ec7u trong qu\u00e1 tr\u00ecnh truy\u1ec1n.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00ednh to\u00e1n nhanh:<\/strong> T\u00ednh to\u00e1n t\u1ed5ng ki\u1ec3m tra kh\u00f4ng t\u1ed1n k\u00e9m v\u1ec1 m\u1eb7t t\u00ednh to\u00e1n, khi\u1ebfn ch\u00fang tr\u1edf n\u00ean thi\u1ebft th\u1ef1c cho c\u00e1c \u1ee9ng d\u1ee5ng th\u1eddi gian th\u1ef1c.<\/p>\n<\/li>\n<li>\n<p><strong>Chi\u1ec1u d\u00e0i c\u1ed1 \u0111\u1ecbnh:<\/strong> T\u1ed5ng ki\u1ec3m tra c\u00f3 \u0111\u1ed9 d\u00e0i c\u1ed1 \u0111\u1ecbnh, b\u1ea5t k\u1ec3 k\u00edch th\u01b0\u1edbc d\u1eef li\u1ec7u, gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a vi\u1ec7c s\u1eed d\u1ee5ng v\u00e0 l\u01b0u tr\u1eef ch\u00fang.<\/p>\n<\/li>\n<li>\n<p><strong>Phi m\u1eadt m\u00e3:<\/strong> H\u1ea7u h\u1ebft c\u00e1c thu\u1eadt to\u00e1n t\u1ed5ng ki\u1ec3m tra kh\u00f4ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho m\u1ee5c \u0111\u00edch m\u00e3 h\u00f3a nh\u01b0ng \u0111\u1ee7 \u0111\u1ec3 ph\u00e1t hi\u1ec7n l\u1ed7i.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i t\u1ed5ng ki\u1ec3m tra<\/h2>\n<p>C\u00f3 nhi\u1ec1u thu\u1eadt to\u00e1n t\u1ed5ng ki\u1ec3m tra kh\u00e1c nhau, m\u1ed7i thu\u1eadt to\u00e1n c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m ri\u00eang. M\u1ed9t s\u1ed1 lo\u1ea1i t\u1ed5ng ki\u1ec3m tra th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng bao g\u1ed3m:<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i t\u1ed5ng ki\u1ec3m tra<\/th>\n<th>Thu\u1eadt to\u00e1n<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ki\u1ec3m tra d\u1ef1 ph\u00f2ng theo chu k\u1ef3 (CRC)<\/td>\n<td>CRC-16, CRC-32<\/td>\n<td>Ph\u1ed5 bi\u1ebfn cho c\u00e1c \u1ee9ng d\u1ee5ng l\u01b0u tr\u1eef v\u00e0 truy\u1ec1n th\u00f4ng m\u1ea1ng.<\/td>\n<\/tr>\n<tr>\n<td>Adler-32<\/td>\n<td>Thu\u1eadt to\u00e1n Adler-32<\/td>\n<td>\u0110\u01a1n gi\u1ea3n v\u00e0 nhanh ch\u00f3ng, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ki\u1ec3m tra t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a t\u1ec7p.<\/td>\n<\/tr>\n<tr>\n<td>MD5<\/td>\n<td>Thu\u1eadt to\u00e1n MD5<\/td>\n<td>\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 x\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a t\u1eadp tin.<\/td>\n<\/tr>\n<tr>\n<td>SHA-1<\/td>\n<td>Thu\u1eadt to\u00e1n SHA-1<\/td>\n<td>Cung c\u1ea5p b\u1ea3o m\u1eadt t\u1ed1t h\u01a1n MD5 nh\u01b0ng hi\u1ec7n \u0111\u01b0\u1ee3c coi l\u00e0 y\u1ebfu.<\/td>\n<\/tr>\n<tr>\n<td>SHA-256<\/td>\n<td>Thu\u1eadt to\u00e1n SHA-256<\/td>\n<td>M\u1ed9t ph\u1ea7n c\u1ee7a gia \u0111\u00ecnh SHA-2, cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o m\u1eadt m\u1ea1nh m\u1ebd.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng t\u1ed5ng ki\u1ec3m tra, v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng<\/h2>\n<p>T\u1ed5ng ki\u1ec3m tra t\u00ecm \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>Truy\u1ec1n d\u1eef li\u1ec7u:<\/strong> T\u1ed5ng ki\u1ec3m tra \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o truy\u1ec1n d\u1eef li\u1ec7u kh\u00f4ng c\u00f3 l\u1ed7i qua c\u00e1c k\u00eanh kh\u00f4ng \u0111\u00e1ng tin c\u1eady nh\u01b0 internet.<\/p>\n<\/li>\n<li>\n<p><strong>X\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a t\u1ec7p:<\/strong> Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 x\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a t\u1ec7p b\u1eb1ng c\u00e1ch so s\u00e1nh t\u1ed5ng ki\u1ec3m tra tr\u01b0\u1edbc v\u00e0 sau khi truy\u1ec1n ho\u1eb7c l\u01b0u tr\u1eef.<\/p>\n<\/li>\n<li>\n<p><strong>Truy\u1ec1n th\u00f4ng m\u1ea1ng:<\/strong> T\u1ed5ng ki\u1ec3m tra gi\u00fap ph\u00e1t hi\u1ec7n l\u1ed7i trong c\u00e1c g\u00f3i m\u1ea1ng, n\u00e2ng cao \u0111\u1ed9 tin c\u1eady c\u1ee7a d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<\/ol>\n<h3>V\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p:<\/h3>\n<ul>\n<li>\n<p><strong>Va ch\u1ea1m:<\/strong> D\u1eef li\u1ec7u kh\u00e1c nhau c\u00f3 th\u1ec3 t\u1ea1o ra c\u00f9ng m\u1ed9t t\u1ed5ng ki\u1ec3m tra, d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 d\u01b0\u01a1ng t\u00ednh gi\u1ea3. H\u00e0m b\u0103m m\u1eadt m\u00e3 (v\u00ed d\u1ee5: SHA-256) l\u00e0m gi\u1ea3m r\u1ee7i ro n\u00e0y.<\/p>\n<\/li>\n<li>\n<p><strong>Thu\u1eadt to\u00e1n y\u1ebfu:<\/strong> C\u00e1c thu\u1eadt to\u00e1n t\u1ed5ng ki\u1ec3m tra l\u1ed7i th\u1eddi nh\u01b0 MD5 v\u00e0 SHA-1 d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng. Vi\u1ec7c n\u00e2ng c\u1ea5p l\u00ean c\u00e1c thu\u1eadt to\u00e1n m\u1ea1nh h\u01a1n s\u1ebd gi\u1ea3m thi\u1ec3u v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1 li\u00ean quan \u0111\u1ebfn t\u1ed5ng ki\u1ec3m tra:<\/p>\n<table>\n<thead>\n<tr>\n<th>Thu\u1eadt ng\u1eef<\/th>\n<th>\u0110\u1eb7c tr\u01b0ng<\/th>\n<th>So s\u00e1nh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>T\u1ed5ng ki\u1ec3m tra<\/td>\n<td>Ph\u00e1t hi\u1ec7n l\u1ed7i, \u0111\u1ed9 d\u00e0i c\u1ed1 \u0111\u1ecbnh, kh\u00f4ng m\u1eadt m\u00e3<\/td>\n<td>\u0110\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u trong qu\u00e1 tr\u00ecnh l\u01b0u tr\u1eef ho\u1eb7c truy\u1ec1n t\u1ea3i.<\/td>\n<\/tr>\n<tr>\n<td>B\u0103m<\/td>\n<td>H\u00e0m m\u1ed9t chi\u1ec1u, m\u1eadt m\u00e3, \u0111\u1ed9 d\u00e0i c\u1ed1 \u0111\u1ecbnh<\/td>\n<td>Th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho m\u1ee5c \u0111\u00edch b\u1ea3o m\u1eadt d\u1eef li\u1ec7u nh\u01b0 b\u0103m m\u1eadt kh\u1ea9u.<\/td>\n<\/tr>\n<tr>\n<td>M\u00e3 h\u00f3a<\/td>\n<td>H\u00e0m hai chi\u1ec1u, m\u1eadt m\u00e3, \u0111\u1ed9 d\u00e0i thay \u0111\u1ed5i<\/td>\n<td>B\u1ea3o v\u1ec7 quy\u1ec1n ri\u00eang t\u01b0 c\u1ee7a d\u1eef li\u1ec7u th\u00f4ng qua m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3.<\/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 t\u1ed5ng ki\u1ec3m tra<\/h2>\n<p>Khi c\u00f4ng ngh\u1ec7 ti\u1ebfn b\u1ed9, thu\u1eadt to\u00e1n t\u1ed5ng ki\u1ec3m tra s\u1ebd ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n \u0111\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u b\u1ea3o m\u1eadt cao h\u01a1n. Xu h\u01b0\u1edbng trong t\u01b0\u01a1ng lai c\u00f3 th\u1ec3 bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>T\u1ed5ng ki\u1ec3m tra an to\u00e0n l\u01b0\u1ee3ng t\u1eed:<\/strong> V\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a \u0111i\u1ec7n to\u00e1n l\u01b0\u1ee3ng t\u1eed, c\u00e1c thu\u1eadt to\u00e1n t\u1ed5ng ki\u1ec3m tra ch\u1ed1ng l\u1ea1i c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng l\u01b0\u1ee3ng t\u1eed s\u1ebd tr\u1edf n\u00ean quan tr\u1ecdng \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u an to\u00e0n.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00edch h\u1ee3p chu\u1ed7i kh\u1ed1i:<\/strong> C\u00f4ng ngh\u1ec7 chu\u1ed7i kh\u1ed1i c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p t\u1ed5ng ki\u1ec3m tra \u0111\u1ec3 n\u00e2ng cao t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u trong c\u00e1c h\u1ec7 th\u1ed1ng phi t\u1eadp trung.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi t\u1ed5ng ki\u1ec3m tra<\/h2>\n<p>C\u00e1c m\u00e1y ch\u1ee7 proxy, gi\u1ed1ng nh\u01b0 c\u00e1c m\u00e1y ch\u1ee7 do OneProxy cung c\u1ea5p, \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o truy\u1ec1n d\u1eef li\u1ec7u an to\u00e0n v\u00e0 \u0111\u00e1ng tin c\u1eady. Khi ng\u01b0\u1eddi d\u00f9ng s\u1eed d\u1ee5ng m\u00e1y ch\u1ee7 proxy, c\u00e1c g\u00f3i d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c chuy\u1ec3n ti\u1ebfp qua m\u00e1y ch\u1ee7 trung gian tr\u01b0\u1edbc khi \u0111\u1ebfn \u0111\u00edch. Trong qu\u00e1 tr\u00ecnh n\u00e0y, t\u1ed5ng ki\u1ec3m tra \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n l\u1ea1i t\u1ea1i m\u00e1y ch\u1ee7 proxy \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n<p>M\u00e1y ch\u1ee7 proxy c\u00f3 l\u1ee3i cho:<\/p>\n<ul>\n<li>\n<p><strong>\u1ea8n danh:<\/strong> M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 che gi\u1ea5u \u0111\u1ecba ch\u1ec9 IP c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, cung c\u1ea5p m\u1ee9c \u0111\u1ed9 \u1ea9n danh.<\/p>\n<\/li>\n<li>\n<p><strong>L\u1ecdc n\u1ed9i dung:<\/strong> Proxy c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 v\u01b0\u1ee3t qua c\u00e1c h\u1ea1n ch\u1ebf v\u1ec1 n\u1ed9i dung v\u00e0 truy c\u1eadp c\u00e1c trang web b\u1ecb ch\u1eb7n.<\/p>\n<\/li>\n<li>\n<p><strong>C\u00e2n b\u1eb1ng t\u1ea3i:<\/strong> Proxy ph\u00e2n ph\u1ed1i l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7, t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t.<\/p>\n<\/li>\n<li>\n<p><strong>B\u1ed9 nh\u1edb \u0111\u1ec7m:<\/strong> M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy c\u1eadp th\u01b0\u1eddng xuy\u00ean, gi\u1ea3m th\u1eddi gian t\u1ea3i v\u00e0 s\u1eed d\u1ee5ng b\u0103ng th\u00f4ng.<\/p>\n<\/li>\n<\/ul>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 t\u1ed5ng ki\u1ec3m tra, vui l\u00f2ng kh\u00e1m ph\u00e1 c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Checksum\" target=\"_new\" rel=\"noopener nofollow\">Wikipedia: T\u1ed5ng ki\u1ec3m tra<\/a><\/li>\n<li><a href=\"https:\/\/www.hackers-arise.com\/post\/2018\/09\/26\/checksum-algorithms-explained\" target=\"_new\" rel=\"noopener nofollow\">Gi\u1ea3i th\u00edch thu\u1eadt to\u00e1n t\u1ed5ng ki\u1ec3m tra<\/a><\/li>\n<li><a href=\"https:\/\/homes.cs.washington.edu\/~edd\/papers\/MetzgerCRC-TR.pdf\" target=\"_new\" rel=\"noopener nofollow\">M\u1ed9t nghi\u00ean c\u1ee9u v\u1ec1 t\u1ed5ng ki\u1ec3m tra<\/a><\/li>\n<\/ul>","protected":false},"featured_media":467848,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476217","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Checksum: A Comprehensive Guide<\/mark>","faq_items":[{"question":"<strong>FAQs about Checksum: A Comprehensive Guide<\/strong>","answer":""},{"question":"<strong>What is a checksum?<\/strong>","answer":"<p>A checksum is a numerical value derived from a set of data, used to detect errors and ensure data integrity during transmission and storage. It acts as a unique signature for the data, allowing users to verify if it has been altered or corrupted.<\/p>"},{"question":"<strong>How does a checksum work?<\/strong>","answer":"<p>Checksums are generated using algorithms that apply mathematical functions to the data. The most common method is the Cyclic Redundancy Check (CRC), which divides the data by a fixed divisor and retains the remainder as the checksum. Both the sender and receiver calculate the checksum, and by comparing the calculated checksum with the received checksum, errors can be detected.<\/p>"},{"question":"<strong>What are the key features of checksums?<\/strong>","answer":"<ul><li>Error Detection: Checksums efficiently detect errors, ensuring data reliability.<\/li><li>Fast Computation: Calculating checksums is quick, making them suitable for real-time applications.<\/li><li>Fixed Length: Checksums have a fixed size, simplifying usage and storage.<\/li><li>Non-Cryptographic: While not designed for security purposes, they are effective for error detection.<\/li><\/ul>"},{"question":"<strong>What types of checksums exist?<\/strong>","answer":"<p>Several types of checksums include Cyclic Redundancy Check (CRC), Adler-32, MD5, SHA-1, and SHA-256. Each algorithm has its characteristics and level of security.<\/p>"},{"question":"<strong>How are checksums used?<\/strong>","answer":"<p>Checksums find applications in data transmission, file integrity verification, and network communication. They ensure data integrity over unreliable channels and help verify the integrity of transmitted files.<\/p>"},{"question":"<strong>What are the problems and solutions related to checksum usage?<\/strong>","answer":"<p>Some problems include collisions and weak algorithms. Collisions occur when different data produces the same checksum, leading to false positives. Using stronger algorithms like SHA-256 can reduce this risk.<\/p>"},{"question":"<strong>How do checksums compare to similar terms like hashes and encryption?<\/strong>","answer":"<p>Checksums are primarily for error detection and data integrity, while hashes are cryptographic one-way functions. Encryption, on the other hand, is a two-way cryptographic function used to protect data privacy.<\/p>"},{"question":"<strong>What are the future technologies related to checksums?<\/strong>","answer":"<p>The future may bring quantum-safe checksums to resist quantum attacks and integration of checksums into blockchain technology for enhanced data integrity in decentralized systems.<\/p>"},{"question":"<strong>How are proxy servers associated with checksums?<\/strong>","answer":"<p>Proxy servers, like OneProxy, ensure secure and reliable data transmission. When using a proxy server, checksums are recalculated at the server to maintain data integrity during forwarding.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476217","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\/476217\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/467848"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476217"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}