{"id":477779,"date":"2023-08-09T09:20:08","date_gmt":"2023-08-09T09:20:08","guid":{"rendered":""},"modified":"2023-09-05T11:15:24","modified_gmt":"2023-09-05T11:15:24","slug":"keystream","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/keystream\/","title":{"rendered":"D\u00f2ng kh\u00f3a"},"content":{"rendered":"<p>Th\u00f4ng tin t\u00f3m t\u1eaft v\u1ec1 Keystream<\/p>\n<p>D\u00f2ng kh\u00f3a l\u00e0 m\u1ed9t chu\u1ed7i bit \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1eadt m\u00e3 d\u00f2ng, m\u1ed9t lo\u1ea1i m\u1eadt m\u00e3 kh\u00f3a \u0111\u1ed1i x\u1ee9ng. N\u00f3 ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p d\u00f2ng kh\u00f3a v\u1edbi b\u1ea3n r\u00f5 \u0111\u1ec3 t\u1ea1o ra b\u1ea3n m\u00e3. C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t d\u00f2ng kh\u00f3a \u0111\u1ec3 gi\u1ea3i m\u00e3 tin nh\u1eafn, mi\u1ec5n l\u00e0 c\u1ea3 ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn \u0111\u1ec1u bi\u1ebft c\u00f9ng m\u1ed9t kh\u00f3a \u0111\u1ed1i x\u1ee9ng. D\u00f2ng kh\u00f3a \u0111\u01b0\u1ee3c t\u1ea1o \u0111\u00fang c\u00e1ch c\u00f3 c\u00e1c thu\u1ed9c t\u00ednh t\u01b0\u01a1ng t\u1ef1 nh\u01b0 b\u1ea3ng \u0111\u1ec7m m\u1ed9t l\u1ea7n, cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o m\u1eadt m\u1ea1nh m\u1ebd khi \u0111\u01b0\u1ee3c x\u1eed l\u00fd ch\u00ednh x\u00e1c.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a d\u00f2ng kh\u00f3a v\u00e0 s\u1ef1 \u0111\u1ec1 c\u1eadp \u0111\u1ea7u ti\u00ean v\u1ec1 n\u00f3<\/h2>\n<p>Ngu\u1ed3n g\u1ed1c c\u1ee7a Keystream c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb vi\u1ec7c ph\u00e1t minh ra m\u1eadt m\u00e3 d\u00f2ng, xu\u1ea5t hi\u1ec7n v\u00e0o \u0111\u1ea7u th\u1ebf k\u1ef7 20. Kh\u00e1i ni\u1ec7m s\u1eed d\u1ee5ng d\u00f2ng kh\u00f3a \u0111\u1ec3 m\u00e3 h\u00f3a \u0111\u01b0\u1ee3c l\u1ea5y c\u1ea3m h\u1ee9ng t\u1eeb b\u1ea3ng \u0111\u1ec7m m\u1ed9t l\u1ea7n, do Gilbert Vernam ph\u00e1t minh v\u00e0o n\u0103m 1917. V\u00e0o nh\u1eefng n\u0103m 1970, v\u1edbi s\u1ef1 ti\u1ebfn b\u1ed9 c\u1ee7a c\u00f4ng ngh\u1ec7 m\u00e1y t\u00ednh, m\u1eadt m\u00e3 d\u00f2ng v\u00e0 d\u00f2ng kh\u00f3a tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn h\u01a1n, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a RC4 thu\u1eadt to\u00e1n c\u1ee7a Ron Rivest.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Keystream. M\u1edf r\u1ed9ng d\u00f2ng kh\u00f3a ch\u1ee7 \u0111\u1ec1<\/h2>\n<p>D\u00f2ng kh\u00f3a v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 m\u1ed9t lu\u1ed3ng c\u00e1c s\u1ed1 ng\u1eabu nhi\u00ean ho\u1eb7c gi\u1ea3 ng\u1eabu nhi\u00ean \u0111\u01b0\u1ee3c t\u1ea1o b\u1eb1ng thu\u1eadt to\u00e1n m\u00e3 h\u00f3a. Lu\u1ed3ng n\u00e0y \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi b\u1ea3n r\u00f5 b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng ph\u00e9p to\u00e1n nh\u1ecb ph\u00e2n \u0111\u01a1n gi\u1ea3n (ch\u1eb3ng h\u1ea1n nh\u01b0 XOR) \u0111\u1ec3 t\u1ea1o ra b\u1ea3n m\u00e3. Ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 s\u1ee9c m\u1ea1nh c\u1ee7a d\u00f2ng kh\u00f3a ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0:<\/p>\n<ul>\n<li>Thu\u1eadt to\u00e1n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra d\u00f2ng kh\u00f3a.<\/li>\n<li>\u0110\u1ed9 d\u00e0i v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a kh\u00f3a.<\/li>\n<li>Vect\u01a1 kh\u1edfi t\u1ea1o (n\u1ebfu c\u00f3).<\/li>\n<li>Ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 k\u1ebft h\u1ee3p d\u00f2ng kh\u00f3a v\u1edbi b\u1ea3n r\u00f5.<\/li>\n<\/ul>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a d\u00f2ng kh\u00f3a. C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Keystream<\/h2>\n<p>D\u00f2ng kh\u00f3a ho\u1ea1t \u0111\u1ed9ng theo c\u00e1ch sau:<\/p>\n<ol>\n<li><strong>Kh\u1edfi t\u1ea1o<\/strong>: M\u1ed9t kh\u00f3a b\u00ed m\u1eadt v\u00e0, n\u1ebfu \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u, vect\u01a1 kh\u1edfi t\u1ea1o (IV) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 kh\u1edfi t\u1ea1o b\u1ed9 t\u1ea1o d\u00f2ng kh\u00f3a.<\/li>\n<li><strong>T\u1ea1o d\u00f2ng kh\u00f3a<\/strong>: B\u1ed9 t\u1ea1o t\u1ea1o ra m\u1ed9t chu\u1ed7i bit (d\u00f2ng kh\u00f3a) d\u1ef1a tr\u00ean kh\u00f3a b\u00ed m\u1eadt v\u00e0 IV.<\/li>\n<li><strong>K\u1ebft h\u1ee3p v\u1edbi b\u1ea3n r\u00f5<\/strong>: D\u00f2ng kh\u00f3a \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi b\u1ea3n r\u00f5 b\u1eb1ng ph\u00e9p to\u00e1n nh\u1ecb ph\u00e2n, th\u01b0\u1eddng l\u00e0 XOR.<\/li>\n<li><strong>gi\u1ea3i m\u00e3<\/strong>: C\u00f9ng m\u1ed9t d\u00f2ng kh\u00f3a, \u0111\u01b0\u1ee3c t\u1ea1o b\u1eb1ng c\u00f9ng m\u1ed9t kh\u00f3a v\u00e0 IV, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c thao t\u00e1c v\u00e0 truy xu\u1ea5t b\u1ea3n r\u00f5.<\/li>\n<\/ol>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Keystream<\/h2>\n<ul>\n<li><strong>B\u1ea3o v\u1ec7<\/strong>: N\u1ebfu \u0111\u01b0\u1ee3c tri\u1ec3n khai ch\u00ednh x\u00e1c, m\u1eadt m\u00e3 d\u1ef1a tr\u00ean d\u00f2ng kh\u00f3a s\u1ebd mang l\u1ea1i t\u00ednh b\u1ea3o m\u1eadt m\u1ea1nh m\u1ebd.<\/li>\n<li><strong>Hi\u1ec7u qu\u1ea3<\/strong>: M\u1eadt m\u00e3 d\u00f2ng kh\u00f3a th\u01b0\u1eddng nhanh v\u00e0 ti\u1ebft ki\u1ec7m t\u00e0i nguy\u00ean.<\/li>\n<li><strong>\u0110\u1ed9 nh\u1ea1y ph\u00edm<\/strong>: M\u1ed9t thay \u0111\u1ed5i nh\u1ecf trong kh\u00f3a s\u1ebd t\u1ea1o ra d\u00f2ng kh\u00f3a r\u1ea5t kh\u00e1c.<\/li>\n<li><strong>R\u1ee7i ro t\u00e1i s\u1eed d\u1ee5ng<\/strong>: Vi\u1ec7c s\u1eed d\u1ee5ng l\u1ea1i d\u00f2ng kh\u00f3a v\u1edbi c\u00e1c th\u00f4ng b\u00e1o kh\u00e1c nhau c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh b\u1ea3o m\u1eadt.<\/li>\n<\/ul>\n<h2>Vi\u1ebft nh\u1eefng lo\u1ea1i d\u00f2ng kh\u00f3a n\u00e0o t\u1ed3n t\u1ea1i. S\u1eed d\u1ee5ng b\u1ea3ng v\u00e0 danh s\u00e1ch \u0111\u1ec3 vi\u1ebft<\/h2>\n<table>\n<thead>\n<tr>\n<th>Thu\u1eadt to\u00e1n<\/th>\n<th>Lo\u1ea1i d\u00f2ng kh\u00f3a<\/th>\n<th>\u0110\u1ed9 d\u00e0i kh\u00f3a (bit)<\/th>\n<th>T\u00ednh n\u0103ng n\u1ed5i b\u1eadt<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>RC4<\/td>\n<td>gi\u1ea3 ng\u1eabu nhi\u00ean<\/td>\n<td>40-2048<\/td>\n<td>S\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i<\/td>\n<\/tr>\n<tr>\n<td>Salsa20<\/td>\n<td>gi\u1ea3 ng\u1eabu nhi\u00ean<\/td>\n<td>256<\/td>\n<td>B\u1ea3o m\u1eadt cao<\/td>\n<\/tr>\n<tr>\n<td>ChaCha<\/td>\n<td>gi\u1ea3 ng\u1eabu nhi\u00ean<\/td>\n<td>256<\/td>\n<td>Salsa20 c\u1ea3i ti\u1ebfn<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng Keystream, v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng<\/h2>\n<ul>\n<li><strong>C\u00e1ch s\u1eed d\u1ee5ng<\/strong>: M\u00e3 h\u00f3a d\u1eef li\u1ec7u, li\u00ean l\u1ea1c an to\u00e0n, ch\u1eef k\u00fd s\u1ed1.<\/li>\n<li><strong>C\u00e1c v\u1ea5n \u0111\u1ec1<\/strong>: Qu\u1ea3n l\u00fd kh\u00f3a, r\u1ee7i ro s\u1eed d\u1ee5ng l\u1ea1i d\u00f2ng kh\u00f3a, c\u00e1c l\u1ed7 h\u1ed5ng ti\u1ec1m \u1ea9n trong thu\u1eadt to\u00e1n.<\/li>\n<li><strong>C\u00e1c gi\u1ea3i ph\u00e1p<\/strong>: Qu\u1ea3n l\u00fd kh\u00f3a ph\u00f9 h\u1ee3p, s\u1eed d\u1ee5ng IV m\u1edbi, s\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n \u0111\u00e3 \u0111\u01b0\u1ee3c hi\u1ec7u \u0111\u00ednh v\u00e0 ti\u00eau chu\u1ea9n h\u00f3a.<\/li>\n<\/ul>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 nh\u1eefng so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1 \u1edf d\u1ea1ng b\u1ea3ng v\u00e0 danh s\u00e1ch<\/h2>\n<table>\n<thead>\n<tr>\n<th>Thu\u1eadt ng\u1eef<\/th>\n<th>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh<\/th>\n<th>\u0110i\u1ec3m t\u01b0\u01a1ng \u0111\u1ed3ng v\u1edbi Keystream<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Kh\u00f3a m\u1eadt m\u00e3<\/td>\n<td>M\u00e3 h\u00f3a d\u1eef li\u1ec7u trong c\u00e1c kh\u1ed1i c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh<\/td>\n<td>M\u1eadt m\u00e3 kh\u00f3a \u0111\u1ed1i x\u1ee9ng<\/td>\n<\/tr>\n<tr>\n<td>M\u1eadt m\u00e3 lu\u1ed3ng<\/td>\n<td>M\u00e3 h\u00f3a d\u1eef li\u1ec7u t\u1eebng bit ho\u1eb7c byte b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng d\u00f2ng kh\u00f3a<\/td>\n<td>S\u1eed d\u1ee5ng d\u00f2ng kh\u00f3a<\/td>\n<\/tr>\n<tr>\n<td>Pad m\u1ed9t l\u1ea7n<\/td>\n<td>S\u1eed d\u1ee5ng d\u00f2ng kh\u00f3a th\u1ef1c s\u1ef1 ng\u1eabu nhi\u00ean<\/td>\n<td>B\u1ea3o m\u1eadt ho\u00e0n h\u1ea3o n\u1ebfu s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1ch<\/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 Keystream<\/h2>\n<p>Nh\u1eefng ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn d\u00f2ng kh\u00f3a c\u00f3 th\u1ec3 bao g\u1ed3m:<\/p>\n<ul>\n<li>C\u00e1c thu\u1eadt to\u00e1n kh\u00e1ng l\u01b0\u1ee3ng t\u1eed.<\/li>\n<li>C\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 cho c\u00e1c thi\u1ebft b\u1ecb IoT.<\/li>\n<li>T\u00edch h\u1ee3p v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng m\u1eadt m\u00e3 lai.<\/li>\n<li>Ph\u00e1t tri\u1ec3n c\u00e1c ti\u00eau chu\u1ea9n v\u00e0 quy \u0111\u1ecbnh m\u1edbi.<\/li>\n<\/ul>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi Keystream<\/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, c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p v\u1edbi m\u1eadt m\u00e3 d\u00f2ng kh\u00f3a \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt v\u00e0 quy\u1ec1n ri\u00eang t\u01b0. M\u00e3 h\u00f3a d\u00f2ng kh\u00f3a c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n qua m\u00e1y ch\u1ee7 proxy, \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt v\u00e0 to\u00e0n v\u1eb9n. S\u1ef1 k\u1ebft h\u1ee3p c\u00f4ng ngh\u1ec7 n\u00e0y r\u1ea5t quan tr\u1ecdng trong vi\u1ec7c duy tr\u00ec s\u1ef1 hi\u1ec7n di\u1ec7n tr\u1ef1c tuy\u1ebfn an to\u00e0n v\u00e0 \u1ea9n danh.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Stream_cipher\" target=\"_new\" rel=\"noopener nofollow\">Trang Wikipedia v\u1ec1 M\u1eadt m\u00e3<\/a><\/li>\n<li><a href=\"https:\/\/tools.ietf.org\/html\/rfc7465\" target=\"_new\" rel=\"noopener nofollow\">T\u00e0i li\u1ec7u thu\u1eadt to\u00e1n RC4<\/a><\/li>\n<li><a href=\"https:\/\/cr.yp.to\/snuffle.html\" target=\"_new\" rel=\"noopener nofollow\">Thu\u1eadt to\u00e1n Salsa20 v\u00e0 ChaCha<\/a><\/li>\n<li><a href=\"https:\/\/oneproxy.pro\/vn\/\" target=\"_new\" rel=\"noopener\">Trang web OneProxy<\/a><\/li>\n<\/ul>\n<p>C\u00e1c li\u00ean k\u1ebft n\u00e0y cung c\u1ea5p th\u00f4ng tin s\u00e2u r\u1ed9ng h\u01a1n v\u1ec1 d\u00f2ng kh\u00f3a, c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3 v\u00e0 c\u00e1c thu\u1eadt to\u00e1n m\u00e3 h\u00f3a li\u00ean quan c\u0169ng nh\u01b0 th\u00f4ng tin chi ti\u1ebft v\u1ec1 c\u00e1c d\u1ecbch v\u1ee5 c\u1ee7a OneProxy.<\/p>","protected":false},"featured_media":468735,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477779","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Keystream<\/mark>","faq_items":[{"question":"What is a keystream and how does it work in cryptography?","answer":"<p>A keystream is a sequence of bits used in stream ciphers, a type of symmetric key cryptography. It operates by combining the keystream with the plaintext to produce ciphertext. The same keystream is then used to decrypt the message, provided that the same symmetric key is known to both sender and receiver. The process involves initialization with a secret key, keystream generation, combination with plaintext, and decryption.<\/p>"},{"question":"What are some notable algorithms that utilize keystream?","answer":"<p>Some notable algorithms that utilize keystream include RC4, Salsa20, and ChaCha. They differ in key length and features, with RC4 being widely used, Salsa20 known for high security, and ChaCha as an improved version of Salsa20.<\/p>"},{"question":"How can the security of a keystream be compromised?","answer":"<p>The security of a keystream can be compromised through poor key management, the reuse of a keystream with different messages, or potential vulnerabilities in the algorithm used. Proper key management, using fresh initialization vectors, and employing vetted and standardized algorithms are essential practices to maintain security.<\/p>"},{"question":"What's the difference between keystream, block ciphers, and one-time pads?","answer":"<p>Keystream is used in stream ciphers that encrypt data one bit or byte at a time. Block ciphers encrypt data in fixed-size blocks, while one-time pads use a truly random keystream and offer perfect security if used properly. Both block and stream ciphers are forms of symmetric key cryptography.<\/p>"},{"question":"How are proxy servers like OneProxy related to keystream?","answer":"<p>Proxy servers like OneProxy can be used in combination with keystream ciphers to enhance online security and privacy. Keystream encryption can be applied to data transmitted through a proxy server, providing confidentiality and integrity, and thus creating a secure and anonymous online environment.<\/p>"},{"question":"What are the future prospects and technologies related to keystream?","answer":"<p>Future developments related to keystream might include the creation of quantum-resistant algorithms, improved efficiency for IoT devices, integration with hybrid cryptographic systems, and the development of new standards and regulations.<\/p>"},{"question":"Where can I find more information and resources about keystream?","answer":"<p>You can find more information about keystream through various online resources, including the Wikipedia page on stream ciphers, the RC4 Algorithm Documentation, and details about Salsa20 and ChaCha algorithms. For proxy services that can be used with keystream, you may refer to the OneProxy website.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477779","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\/477779\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/468735"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477779"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}