{"id":477428,"date":"2023-08-09T09:14:50","date_gmt":"2023-08-09T09:14:50","guid":{"rendered":""},"modified":"2023-09-05T11:14:41","modified_gmt":"2023-09-05T11:14:41","slug":"hash-chain","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/hash-chain\/","title":{"rendered":"Chu\u1ed7i b\u0103m"},"content":{"rendered":"<p>Chu\u1ed7i b\u0103m l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n trong m\u1eadt m\u00e3, \u0111\u00f3ng vai tr\u00f2 l\u00e0 x\u01b0\u01a1ng s\u1ed1ng c\u1ee7a nhi\u1ec1u h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng k\u1ef9 thu\u1eadt s\u1ed1 an to\u00e0n hi\u1ec7n \u0111\u1ea1i. \u0110\u1eb7c t\u00ednh chuy\u1ec3n \u0111\u1ed5i m\u1ed9t chi\u1ec1u v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng gi\u1ea3 m\u1ea1o c\u1ee7a ch\u00fang khi\u1ebfn ch\u00fang tr\u1edf n\u00ean v\u00f4 gi\u00e1 trong nhi\u1ec1u \u1ee9ng d\u1ee5ng, t\u1eeb c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh b\u1ea3o v\u1ec7 m\u1eadt kh\u1ea9u c\u01a1 b\u1ea3n \u0111\u1ebfn c\u00e1c thu\u1eadt to\u00e1n \u0111\u1ed3ng thu\u1eadn n\u00e2ng cao trong c\u00f4ng ngh\u1ec7 chu\u1ed7i kh\u1ed1i.<\/p>\n<h2>Ngu\u1ed3n g\u1ed1c c\u1ee7a chu\u1ed7i b\u0103m v\u00e0 c\u00e1c t\u00e0i li\u1ec7u tham kh\u1ea3o ban \u0111\u1ea7u c\u1ee7a ch\u00fang<\/h2>\n<p>Kh\u00e1i ni\u1ec7m chu\u1ed7i b\u0103m b\u1eaft ngu\u1ed3n t\u1eeb l\u0129nh v\u1ef1c h\u00e0m b\u0103m m\u1eadt m\u00e3 r\u1ed9ng h\u01a1n, xu\u1ea5t hi\u1ec7n t\u1eeb cu\u1ed1i th\u1ebf k\u1ef7 20. H\u00e0m b\u0103m c\u1ee5 th\u1ec3 \u0111\u1ea7u ti\u00ean l\u00e0 c\u1ea5u tr\u00fac Merkle-Damg\u00e5rd, \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t \u0111\u1ed9c l\u1eadp v\u00e0o cu\u1ed1i nh\u1eefng n\u0103m 1970 b\u1edfi Ralph Merkle v\u00e0 Ivan Damg\u00e5rd. C\u1ee5 th\u1ec3, chu\u1ed7i b\u0103m sau \u0111\u00f3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n nh\u01b0 m\u1ed9t c\u00e1ch \u0111\u1ec3 s\u1eed d\u1ee5ng c\u00e1c h\u00e0m b\u0103m n\u00e0y trong c\u00e1c d\u1ecbch v\u1ee5 \u0111\u00e1nh d\u1ea5u th\u1eddi gian v\u00e0 ch\u1eef k\u00fd s\u1ed1, c\u0169ng nh\u01b0 trong vi\u1ec7c t\u1ea1o ra c\u00e1c lu\u1ed3ng s\u1ed1 ng\u1eabu nhi\u00ean ho\u1eb7c gi\u1ea3 ng\u1eabu nhi\u00ean an to\u00e0n.<\/p>\n<h2>M\u1edf r\u1ed9ng kh\u00e1i ni\u1ec7m v\u1ec1 chu\u1ed7i b\u0103m<\/h2>\n<p>Chu\u1ed7i b\u0103m l\u00e0 m\u1ed9t chu\u1ed7i c\u00e1c gi\u00e1 tr\u1ecb b\u0103m trong \u0111\u00f3 m\u1ed7i gi\u00e1 tr\u1ecb b\u0103m \u0111\u01b0\u1ee3c t\u1ea1o t\u1eeb gi\u00e1 tr\u1ecb b\u0103m tr\u01b0\u1edbc \u0111\u00f3, s\u1eed d\u1ee5ng m\u1ed9t h\u00e0m b\u0103m c\u1ee5 th\u1ec3. V\u1ec1 c\u01a1 b\u1ea3n, c\u1ea5u tr\u00fac n\u00e0y l\u00e0 m\u1ed9t d\u1ea1ng t\u1ed5 ch\u1ee9c d\u1eef li\u1ec7u, li\u00ean k\u1ebft m\u1ed9t lo\u1ea1t c\u00e1c m\u1ee5c d\u1eef li\u1ec7u, trong \u0111\u00f3 m\u1ed7i m\u1ee5c ti\u1ebfp theo ph\u1ee5 thu\u1ed9c v\u1ec1 m\u1eb7t m\u1eadt m\u00e3 v\u00e0o m\u1ee5c tr\u01b0\u1edbc \u0111\u00f3 v\u1ec1 m\u1eb7t m\u1eadt m\u00e3. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ea5t k\u1ef3 thay \u0111\u1ed5i n\u00e0o \u0111\u1ed1i v\u1edbi m\u1ed9t kh\u1ed1i d\u1eef li\u1ec7u trong chu\u1ed7i s\u1ebd l\u00e0m thay \u0111\u1ed5i t\u1ea5t c\u1ea3 c\u00e1c gi\u00e1 tr\u1ecb b\u0103m ti\u1ebfp theo, khi\u1ebfn cho vi\u1ec7c gi\u1ea3 m\u1ea1o tr\u00e1i ph\u00e9p c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng b\u1ecb ph\u00e1t hi\u1ec7n.<\/p>\n<p>Cho m\u1ed9t gi\u00e1 tr\u1ecb b\u1eaft \u0111\u1ea7u ho\u1eb7c h\u1ea1t gi\u1ed1ng, chu\u1ed7i b\u0103m c\u00f3 \u0111\u1ed9 d\u00e0i N \u0111\u01b0\u1ee3c t\u1ea1o b\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng h\u00e0m b\u0103m N l\u1ea7n. V\u00ed d\u1ee5: n\u1ebfu H() l\u00e0 h\u00e0m b\u0103m v\u00e0 S l\u00e0 h\u1ea1t gi\u1ed1ng, chu\u1ed7i b\u0103m c\u00f3 \u0111\u1ed9 d\u00e0i 3 s\u1ebd tr\u00f4ng nh\u01b0 sau: <code data-no-translation=\"\">H(H(H(S))) -&gt; H(H(S)) -&gt; H(S) -&gt; S<\/code><\/p>\n<h2>Ho\u1ea1t \u0111\u1ed9ng n\u1ed9i b\u1ed9 c\u1ee7a chu\u1ed7i b\u0103m<\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u ch\u1ee9c n\u0103ng c\u1ee7a chu\u1ed7i b\u0103m, tr\u01b0\u1edbc ti\u00ean ng\u01b0\u1eddi ta ph\u1ea3i n\u1eafm \u0111\u01b0\u1ee3c kh\u00e1i ni\u1ec7m v\u1ec1 h\u00e0m b\u0103m m\u1eadt m\u00e3. N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, h\u00e0m b\u0103m l\u00e0 m\u1ed9t h\u00e0m to\u00e1n h\u1ecdc 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 \u1edf d\u1ea1ng &#039;th\u00f4ng b\u00e1o&#039;. \u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a h\u00e0m b\u0103m m\u1eadt m\u00e3 l\u00e0 kh\u00f4ng th\u1ec3 t\u00ednh to\u00e1n \u0111\u01b0\u1ee3c \u0111\u1ec3 truy xu\u1ea5t \u0111\u1ea7u v\u00e0o ban \u0111\u1ea7u ch\u1ec9 v\u1edbi b\u1ea3n t\u00f3m t\u1eaft.<\/p>\n<p>Trong chu\u1ed7i b\u0103m, h\u00e0m b\u0103m \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u1eb7p \u0111i l\u1eb7p l\u1ea1i theo m\u1ed9t chu\u1ed7i c\u00e1c l\u1ea7n l\u1eb7p, m\u1ed7i \u0111\u1ea7u ra l\u00e0 \u0111\u1ea7u v\u00e0o cho l\u1ea7n l\u1eb7p ti\u1ebfp theo. Sau khi tr\u00ecnh t\u1ef1 ho\u00e0n t\u1ea5t, m\u1ecdi n\u1ed7 l\u1ef1c thay \u0111\u1ed5i b\u1ea5t k\u1ef3 ph\u1ea7n n\u00e0o c\u1ee7a d\u1eef li\u1ec7u s\u1ebd d\u1eabn \u0111\u1ebfn h\u00e0m b\u0103m \u0111\u1ea7u ra kh\u00e1c, \u0111i\u1ec1u n\u00e0y s\u1ebd d\u1ec5 nh\u1eadn th\u1ea5y khi so s\u00e1nh v\u1edbi gi\u00e1 tr\u1ecb ch\u00ednh x\u00e1c \u0111\u00e3 bi\u1ebft.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Chu\u1ed7i Hash<\/h2>\n<p>Chu\u1ed7i b\u0103m cung c\u1ea5p m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh:<\/p>\n<ol>\n<li>\n<p><strong>T\u00ednh b\u1ea5t bi\u1ebfn:<\/strong> Khi chu\u1ed7i b\u0103m \u0111\u01b0\u1ee3c t\u1ea1o, n\u00f3 kh\u00f4ng th\u1ec3 b\u1ecb thay \u0111\u1ed5i n\u1ebfu kh\u00f4ng b\u1ecb ph\u00e1t hi\u1ec7n. \u0110i\u1ec1u n\u00e0y l\u00e0 do b\u1ea5t k\u1ef3 thay \u0111\u1ed5i n\u00e0o \u0111\u1ed1i v\u1edbi kh\u1ed1i d\u1eef li\u1ec7u \u0111\u1ec1u thay \u0111\u1ed5i gi\u00e1 tr\u1ecb b\u0103m c\u1ee7a n\u00f3, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea5t c\u1ea3 c\u00e1c gi\u00e1 tr\u1ecb b\u0103m ti\u1ebfp theo trong chu\u1ed7i.<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n \u0111\u1ed5i m\u1ed9t chi\u1ec1u:<\/strong> V\u1edbi gi\u00e1 tr\u1ecb b\u0103m, vi\u1ec7c l\u1ea5y d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o ban \u0111\u1ea7u l\u00e0 kh\u00f4ng th\u1ec3 t\u00ednh to\u00e1n \u0111\u01b0\u1ee3c.<\/p>\n<\/li>\n<li>\n<p><strong>Kh\u00f4ng th\u1ec3 \u0111o\u00e1n tr\u01b0\u1edbc:<\/strong> G\u1ea7n nh\u01b0 kh\u00f4ng th\u1ec3 d\u1ef1 \u0111o\u00e1n gi\u00e1 tr\u1ecb b\u0103m ti\u1ebfp theo trong chu\u1ed7i n\u1ebfu kh\u00f4ng bi\u1ebft \u0111\u1ea7u v\u00e0o v\u00e0 h\u00e0m b\u0103m.<\/p>\n<\/li>\n<li>\n<p><strong>Hi\u1ec7u qu\u1ea3:<\/strong> Chu\u1ed7i b\u0103m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n v\u00e0 x\u00e1c minh t\u01b0\u01a1ng \u0111\u1ed1i nhanh ch\u00f3ng, gi\u00fap ch\u00fang tr\u1edf n\u00ean hi\u1ec7u qu\u1ea3 \u0111\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau trong khoa h\u1ecdc m\u00e1y t\u00ednh v\u00e0 b\u1ea3o m\u1eadt th\u00f4ng tin.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i chu\u1ed7i b\u0103m<\/h2>\n<p>M\u1eb7c d\u00f9 nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n c\u1ee7a chu\u1ed7i b\u0103m v\u1eabn gi\u1eef nguy\u00ean nh\u01b0ng ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean c\u00e1ch s\u1eed d\u1ee5ng trong c\u00e1c s\u01a1 \u0111\u1ed3 m\u1eadt m\u00e3 kh\u00e1c nhau:<\/p>\n<ol>\n<li>\n<p><strong>Chu\u1ed7i b\u0103m \u0111\u01a1n gi\u1ea3n:<\/strong> D\u1ea1ng \u0111\u01a1n gi\u1ea3n nh\u1ea5t c\u1ee7a chu\u1ed7i b\u0103m, nh\u01b0 \u0111\u00e3 gi\u1ea3i th\u00edch \u1edf tr\u00ean.<\/p>\n<\/li>\n<li>\n<p><strong>Chu\u1ed7i b\u0103m c\u00f3 kh\u00f3a:<\/strong> Trong lo\u1ea1i n\u00e0y, m\u1ed7i h\u00e0m b\u0103m trong chu\u1ed7i bao g\u1ed3m m\u1ed9t kh\u00f3a b\u00ed m\u1eadt ngo\u00e0i h\u00e0m b\u0103m tr\u01b0\u1edbc \u0111\u00f3. \u0110i\u1ec1u n\u00e0y mang l\u1ea1i s\u1ef1 b\u1ea3o m\u1eadt b\u1ed5 sung, khi\u1ebfn k\u1ebb t\u1ea5n c\u00f4ng kh\u00f3 t\u00ednh to\u00e1n c\u00e1c gi\u00e1 tr\u1ecb b\u0103m trong t\u01b0\u01a1ng lai h\u01a1n ngay c\u1ea3 khi ch\u00fang bi\u1ebft h\u00e0m b\u0103m v\u00e0 m\u1ed9t s\u1ed1 gi\u00e1 tr\u1ecb b\u0103m tr\u01b0\u1edbc \u0111\u00f3.<\/p>\n<\/li>\n<li>\n<p><strong>Chu\u1ed7i b\u0103m Merkle (C\u00e2y Merkle):<\/strong> \u0110\u00e2y l\u00e0 c\u00e1c c\u1ea5u tr\u00fac c\u00e2y trong \u0111\u00f3 m\u1ed7i n\u00fat l\u00e1 \u0111\u01b0\u1ee3c g\u1eafn nh\u00e3n b\u1eb1ng h\u00e0m b\u0103m c\u1ee7a m\u1ed9t kh\u1ed1i d\u1eef li\u1ec7u v\u00e0 m\u1ecdi n\u00fat kh\u00f4ng ph\u1ea3i l\u00e0 l\u00e1 \u0111\u01b0\u1ee3c g\u1eafn nh\u00e3n b\u1eb1ng h\u00e0m b\u0103m c\u1ee7a nh\u00e3n c\u1ee7a c\u00e1c n\u00fat con c\u1ee7a n\u00f3. C\u00e2y Merkle cho ph\u00e9p x\u00e1c minh hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n n\u1ed9i dung c\u1ee7a c\u1ea5u tr\u00fac d\u1eef li\u1ec7u l\u1edbn.<\/p>\n<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>Ki\u1ec3u<\/th>\n<th>\u00dd ki\u1ebfn c\u01a1 b\u1ea3n<\/th>\n<th>Thu\u1eadn l\u1ee3i<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chu\u1ed7i b\u0103m \u0111\u01a1n gi\u1ea3n<\/td>\n<td>M\u1ed7i h\u00e0m b\u0103m l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a vi\u1ec7c \u00e1p d\u1ee5ng h\u00e0m b\u0103m cho h\u00e0m b\u0103m tr\u01b0\u1edbc \u0111\u00f3.<\/td>\n<td>\u0110\u01a1n gi\u1ea3n \u0111\u1ec3 hi\u1ec3u v\u00e0 th\u1ef1c hi\u1ec7n<\/td>\n<td>Cung c\u1ea5p \u00edt b\u1ea3o m\u1eadt h\u01a1n n\u1ebfu h\u00e0m b\u0103m ho\u1eb7c m\u1ed9t ph\u1ea7n c\u1ee7a chu\u1ed7i b\u1ecb x\u00e2m ph\u1ea1m<\/td>\n<\/tr>\n<tr>\n<td>Chu\u1ed7i b\u0103m c\u00f3 kh\u00f3a<\/td>\n<td>M\u1ed7i h\u00e0m b\u0103m bao g\u1ed3m m\u1ed9t kh\u00f3a b\u00ed m\u1eadt ngo\u00e0i h\u00e0m b\u0103m tr\u01b0\u1edbc \u0111\u00f3.<\/td>\n<td>An to\u00e0n h\u01a1n tr\u01b0\u1edbc c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng<\/td>\n<td>Ph\u1ee9c t\u1ea1p h\u01a1n m\u1ed9t ch\u00fat<\/td>\n<\/tr>\n<tr>\n<td>Chu\u1ed7i b\u0103m Merkle (C\u00e2y Merkle)<\/td>\n<td>M\u1ed9t c\u1ea5u tr\u00fac c\u00e2y trong \u0111\u00f3 m\u1ed7i n\u00fat \u0111\u01b0\u1ee3c g\u1eafn nh\u00e3n b\u1eb1ng h\u00e0m b\u0103m c\u1ee7a kh\u1ed1i d\u1eef li\u1ec7u ho\u1eb7c h\u00e0m b\u0103m c\u1ee7a c\u00e1c nh\u00e3n con c\u1ee7a n\u00f3.<\/td>\n<td>Cho ph\u00e9p x\u00e1c minh hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n c\u00e1c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u l\u1edbn<\/td>\n<td>Ph\u1ee9c t\u1ea1p h\u01a1n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>S\u1eed d\u1ee5ng th\u1ef1c t\u1ebf, th\u00e1ch th\u1ee9c v\u00e0 gi\u1ea3i ph\u00e1p trong \u1ee9ng d\u1ee5ng chu\u1ed7i b\u0103m<\/h2>\n<p>Chu\u1ed7i b\u0103m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng kh\u00e1c nhau:<\/p>\n<ol>\n<li>\n<p><strong>D\u1ecbch v\u1ee5 \u0111\u00f3ng d\u1ea5u th\u1eddi gian:<\/strong> Trong c\u00e1c d\u1ecbch v\u1ee5 n\u00e0y, h\u00e0m b\u0103m c\u1ee7a t\u00e0i li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o chu\u1ed7i b\u0103m, cung c\u1ea5p d\u1ea5u th\u1eddi gian cho t\u00e0i li\u1ec7u m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<\/li>\n<li>\n<p><strong>M\u1eadt kh\u1ea9u d\u00f9ng m\u1ed9t l\u1ea7n (OTP):<\/strong> Trong s\u01a1 \u0111\u1ed3 OTP d\u1ef1a tr\u00ean chu\u1ed7i b\u0103m, m\u1ed7i m\u1eadt kh\u1ea9u trong m\u1ed9t chu\u1ed7i \u0111\u01b0\u1ee3c t\u1ea1o b\u1eb1ng c\u00e1ch b\u0103m m\u1eadt kh\u1ea9u tr\u01b0\u1edbc \u0111\u00f3.<\/p>\n<\/li>\n<li>\n<p><strong>Chu\u1ed7i kh\u1ed1i:<\/strong> M\u1ed7i kh\u1ed1i trong chu\u1ed7i kh\u1ed1i bao g\u1ed3m h\u00e0m b\u0103m c\u1ee7a kh\u1ed1i tr\u01b0\u1edbc \u0111\u00f3, t\u1ea1o th\u00e0nh chu\u1ed7i b\u0103m.<\/p>\n<\/li>\n<\/ol>\n<p>Tuy nhi\u00ean, chu\u1ed7i b\u0103m c\u0169ng c\u00f3 m\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c, \u0111\u1eb7c bi\u1ec7t li\u00ean quan \u0111\u1ebfn vi\u1ec7c l\u1ef1a ch\u1ecdn h\u00e0m b\u0103m. H\u00e0m c\u1ea7n c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng va ch\u1ea1m (hai \u0111\u1ea7u v\u00e0o kh\u00e1c nhau t\u1ea1o ra c\u00f9ng m\u1ed9t h\u00e0m b\u0103m) v\u00e0 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng ti\u1ec1n h\u00ecnh \u1ea3nh (t\u00ednh to\u00e1n \u0111\u1ea7u v\u00e0o ban \u0111\u1ea7u t\u1eeb h\u00e0m b\u0103m c\u1ee7a n\u00f3). V\u00ec v\u1eady, vi\u1ec7c l\u1ef1a ch\u1ecdn h\u00e0m b\u0103m m\u1eadt m\u00e3 m\u1ea1nh l\u00e0 r\u1ea5t quan tr\u1ecdng.<\/p>\n<h2>Ph\u00e2n t\u00edch so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<p>Kh\u00e1i ni\u1ec7m chu\u1ed7i b\u0103m c\u00f3 li\u00ean quan ch\u1eb7t ch\u1ebd nh\u01b0ng kh\u00e1c bi\u1ec7t v\u1edbi m\u1ed9t s\u1ed1 kh\u00e1i ni\u1ec7m m\u1eadt m\u00e3 kh\u00e1c:<\/p>\n<ul>\n<li>\n<p><strong>Danh s\u00e1ch b\u0103m:<\/strong> T\u01b0\u01a1ng t\u1ef1 nh\u01b0 chu\u1ed7i b\u0103m, danh s\u00e1ch b\u0103m bao g\u1ed3m vi\u1ec7c b\u0103m nhi\u1ec1u \u0111\u1ea7u v\u00e0o \u0111\u1ec3 t\u1ea1o danh s\u00e1ch \u0111\u1ea7u ra b\u0103m. Tuy nhi\u00ean, trong danh s\u00e1ch b\u0103m, c\u00e1c gi\u00e1 tr\u1ecb b\u0103m kh\u00f4ng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhau, kh\u00f4ng gi\u1ed1ng nh\u01b0 trong chu\u1ed7i b\u0103m.<\/p>\n<\/li>\n<li>\n<p><strong>C\u00e2y b\u0103m:<\/strong> C\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e2y Merkle, c\u00e2y b\u0103m l\u00e0 d\u1ea1ng t\u1ed5ng qu\u00e1t c\u1ee7a danh s\u00e1ch b\u0103m, v\u1edbi c\u1ea5u tr\u00fac gi\u1ed1ng c\u00e2y cho ph\u00e9p t\u00ednh to\u00e1n v\u00e0 x\u00e1c minh chu\u1ed7i b\u0103m m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<\/li>\n<li>\n<p><strong>Chu\u1ed7i kh\u1ed1i:<\/strong> Chu\u1ed7i kh\u1ed1i l\u00e0 m\u1ed9t lo\u1ea1i chu\u1ed7i b\u0103m c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 \u0111\u1ed3ng thu\u1eadn v\u00e0 duy tr\u00ec b\u1ea3n ghi an to\u00e0n, b\u1eb1ng ch\u1ee9ng gi\u1ea3 m\u1ea1o v\u00e0 kh\u00f4ng th\u1ec3 thay \u0111\u1ed5i v\u1ec1 c\u00e1c giao d\u1ecbch ho\u1eb7c trao \u0111\u1ed5i d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<\/ul>\n<h2>Quan \u0111i\u1ec3m t\u01b0\u01a1ng lai v\u00e0 c\u00f4ng ngh\u1ec7 li\u00ean quan \u0111\u1ebfn chu\u1ed7i b\u0103m<\/h2>\n<p>Khi th\u1ebf gi\u1edbi k\u1ef9 thu\u1eadt s\u1ed1 tr\u1edf n\u00ean d\u1ef1a tr\u00ean d\u1eef li\u1ec7u nhi\u1ec1u h\u01a1n, nhu c\u1ea7u v\u1ec1 c\u1ea5u tr\u00fac d\u1eef li\u1ec7u hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n nh\u01b0 chu\u1ed7i b\u0103m d\u1ef1 ki\u1ebfn s\u1ebd t\u0103ng l\u00ean. C\u00e1c c\u00f4ng ngh\u1ec7 nh\u01b0 s\u1ed5 c\u00e1i ph\u00e2n t\u00e1n, chu\u1ed7i kh\u1ed1i v\u00e0 h\u1ec7 th\u1ed1ng m\u1eadt m\u00e3 ti\u00ean ti\u1ebfn c\u00f3 th\u1ec3 s\u1ebd d\u1ef1a nhi\u1ec1u h\u01a1n v\u00e0o chu\u1ed7i b\u0103m \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n v\u00e0 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u.<\/p>\n<p>C\u00e1c kh\u00e1i ni\u1ec7m m\u1edbi n\u1ed5i nh\u01b0 m\u1eadt m\u00e3 l\u01b0\u1ee3ng t\u1eed v\u00e0 h\u00e0m b\u0103m m\u1eadt m\u00e3 h\u1eadu l\u01b0\u1ee3ng t\u1eed c\u0169ng c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 ph\u00e1t tri\u1ec3n v\u00e0 s\u1eed d\u1ee5ng chu\u1ed7i b\u0103m, mang l\u1ea1i c\u00e1c \u1ee9ng d\u1ee5ng an to\u00e0n v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<h2>Hi\u1ec7p h\u1ed9i c\u00e1c m\u00e1y ch\u1ee7 proxy v\u1edbi chu\u1ed7i b\u0103m<\/h2>\n<p>M\u1eb7c d\u00f9 m\u00e1y ch\u1ee7 proxy v\u00e0 chu\u1ed7i b\u0103m c\u00f3 vai tr\u00f2 ri\u00eang bi\u1ec7t nh\u01b0ng ch\u00fang c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng song song trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p nh\u1ea5t \u0111\u1ecbnh \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt v\u00e0 quy\u1ec1n ri\u00eang t\u01b0. V\u00ed d\u1ee5: chu\u1ed7i b\u0103m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o m\u1eadt li\u00ean l\u1ea1c gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 proxy, \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n v\u00e0 x\u00e1c th\u1ef1c c\u1ee7a d\u1eef li\u1ec7u.<\/p>\n<p>Trong m\u1ed9t s\u1ed1 b\u1ed1i c\u1ea3nh nh\u1ea5t \u0111\u1ecbnh, ch\u1eb3ng h\u1ea1n nh\u01b0 khi s\u1eed d\u1ee5ng m\u00e1y ch\u1ee7 proxy \u0111\u1ec3 qu\u00e9t web, chu\u1ed7i b\u0103m c\u00f3 th\u1ec3 cung c\u1ea5p c\u00e1ch x\u00e1c th\u1ef1c r\u1eb1ng d\u1eef li\u1ec7u kh\u00f4ng b\u1ecb thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh truy\u1ec1n. H\u01a1n n\u1eefa, trong c\u00e1c s\u01a1 \u0111\u1ed3 m\u00e3 h\u00f3a l\u1ea1i proxy \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 chia s\u1ebb d\u1eef li\u1ec7u an to\u00e0n, chu\u1ed7i b\u0103m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 duy tr\u00ec b\u1ea3n ghi an to\u00e0n v\u00e0 c\u00f3 th\u1ec3 x\u00e1c minh \u0111\u01b0\u1ee3c v\u1ec1 c\u00e1c ho\u1ea1t \u0111\u1ed9ng m\u00e3 h\u00f3a l\u1ea1i.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 chu\u1ed7i b\u0103m v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a ch\u00fang, c\u00e1c t\u00e0i nguy\u00ean sau \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t:<\/p>\n<ol>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Cryptographic_hash_function\" target=\"_new\" rel=\"noopener nofollow\">H\u00e0m b\u0103m m\u1eadt m\u00e3<\/a> \u2013 Wikipedia<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hash_chain\" target=\"_new\" rel=\"noopener nofollow\">Chu\u1ed7i b\u0103m<\/a> \u2013 Wikipedia<\/li>\n<li><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1877050918303525\" target=\"_new\" rel=\"noopener nofollow\">S\u1ef1 k\u1ef3 di\u1ec7u c\u1ee7a chu\u1ed7i b\u0103m<\/a> \u2013 Khoa h\u1ecdc tr\u1ef1c ti\u1ebfp<\/li>\n<li><a href=\"https:\/\/www.cs.princeton.edu\/courses\/archive\/spr04\/cos433\/hash.htm\" target=\"_new\" rel=\"noopener nofollow\">H\u00e0m b\u0103m v\u00e0 chu\u1ed7i b\u0103m<\/a> - Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc Princeton<\/li>\n<li><a href=\"https:\/\/www.ibm.com\/blogs\/blockchain\/2019\/09\/blockchain-basics-intro-to-hashes-and-merkle-trees\/\" target=\"_new\" rel=\"noopener nofollow\">Kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n v\u1ec1 Blockchain: H\u00e0m b\u0103m v\u00e0 c\u00e2y Merkle<\/a> \u2013 Blog v\u1ec1 chu\u1ed7i kh\u1ed1i c\u1ee7a IBM<\/li>\n<li><a href=\"https:\/\/www.varonis.com\/blog\/what-is-a-proxy-server\/\" target=\"_new\" rel=\"noopener nofollow\">M\u00e1y ch\u1ee7 proxy l\u00e0 g\u00ec v\u00e0 n\u00f3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/a> \u2013 Blog Varonis<\/li>\n<\/ol>","protected":false},"featured_media":477429,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477428","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Hash Chain: A Key Element of Secure Digital Communications<\/mark>","faq_items":[{"question":"What is a Hash Chain?","answer":"<p>A Hash Chain is a sequence of hash values where each hash is created from the preceding one, using a specific hash function. This structure is a form of data organization, linking a series of data items, where each subsequent item is cryptographically dependent on its predecessor.<\/p>"},{"question":"What are the key features of Hash Chains?","answer":"<p>Hash Chains provide several key features, including immutability (cannot be altered without detection), one-way transformation (computationally infeasible to retrieve the original input from the hash value), unpredictability (nearly impossible to predict the next hash in a chain without knowing the input and the hash function), and efficiency (quick computation and verification).<\/p>"},{"question":"What types of Hash Chains exist?","answer":"<p>There are several types of Hash Chains based on their usage in different cryptographic schemes: Simple Hash Chains, Keyed Hash Chains, and Merkle Hash Chains (Merkle Trees).<\/p>"},{"question":"How are Hash Chains used in practice?","answer":"<p>Hash Chains are used in various applications like Time-Stamping Services (providing a timestamp for a document), One-Time Passwords (generating each password in a sequence by hashing the previous password), and Blockchain (where every block includes the hash of the previous block, forming a hash chain).<\/p>"},{"question":"How are Proxy Servers associated with Hash Chains?","answer":"<p>Proxy servers and hash chains can work together to enhance security and privacy. Hash chains can secure the communication between a client and a proxy server, ensure data integrity and authenticity, and in certain contexts like web scraping, validate that the data hasn't been altered during transit.<\/p>"},{"question":"What are the future perspectives related to Hash Chains?","answer":"<p>As we progress further into the data-driven digital world, the importance of efficient and secure data structures like hash chains is expected to increase. They will likely be more prevalent in technologies like distributed ledgers, blockchain, and advanced cryptographic systems. Also, emerging concepts like quantum cryptography and post-quantum cryptographic hash functions could influence the development and use of hash chains.<\/p>"},{"question":"What resources can I use for further information about Hash Chains?","answer":"<p>Here are some resources for further reading:<\/p><ol><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Cryptographic_hash_function\" target=\"_new\">Cryptographic Hash Functions<\/a> - Wikipedia<\/li><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hash_chain\" target=\"_new\">Hash Chain<\/a> - Wikipedia<\/li><li><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1877050918303525\" target=\"_new\">The Magic of Hash Chain<\/a> - ScienceDirect<\/li><li><a href=\"https:\/\/www.cs.princeton.edu\/courses\/archive\/spr04\/cos433\/hash.htm\" target=\"_new\">Hash functions and hash chains<\/a> - Princeton University<\/li><li><a href=\"https:\/\/www.ibm.com\/blogs\/blockchain\/2019\/09\/blockchain-basics-intro-to-hashes-and-merkle-trees\/\" target=\"_new\">Blockchain Basics: Hash Functions and Merkle Trees<\/a> - IBM Blockchain Blog<\/li><li><a href=\"https:\/\/www.varonis.com\/blog\/what-is-a-proxy-server\/\" target=\"_new\">What is a Proxy Server and How Does it Work?<\/a> - Varonis Blog<\/li><\/ol>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477428","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\/477428\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/477429"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}