{"id":2474,"date":"2025-11-12T20:16:36","date_gmt":"2025-11-12T12:16:36","guid":{"rendered":"https:\/\/pjq.me\/?p=2474"},"modified":"2025-11-13T13:25:38","modified_gmt":"2025-11-13T05:25:38","slug":"%e5%af%86%e7%a0%81%e5%ad%a6cryptography%e7%ae%80%e5%8f%b2-%e5%af%b9%e7%a7%b0%e5%8a%a0%e5%af%86symmetric-encryption","status":"publish","type":"post","link":"https:\/\/pjq.me\/?p=2474","title":{"rendered":"\u5bc6\u7801\u5b66(Cryptography)\u7b80\u53f2-\u5bf9\u79f0\u52a0\u5bc6(Symmetric Encryption)"},"content":{"rendered":"\n<p>\u4e4b\u524d\u4e00\u7bc7\u6587\u7ae0\u8bb2\u8fc7\u53e4\u5178\u5bc6\u7801\u5b66\u3002<\/p>\n\n\n\n<p>\u8fd9\u7bc7\u6587\u7ae0\u6211\u4eec\u6765\u804a\u4e00\u4e0b\u5bf9\u79f0\u52a0\u5bc6(Symmetric Encryption)\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u540d\u5b57\u5176\u5b9e\u6709\u70b9\u552c\u4eba\uff0c\u7b80\u5355\u8bf4\u5c31\u662f\u53ea\u9700\u8981\u4e00\u628a\u94a5\u5319\u53ef\u4ee5\u7528\u6765\u628a\u6587\u4ef6\u52a0\u5bc6\uff0c\u7136\u540e\u89e3\u5bc6\u4e5f\u662f\u540c\u4e00\u628a\u94a5\u5319\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u8bf4\u6211\u4eec\u8981\u5bf9PDF\u8fdb\u884c\u52a0\u5bc6\uff0c\u90a3\u5c31\u4f1a\u6709\u9700\u8981\u540c\u4e00\u4e2a\u5bc6\u7801\u8fdb\u884c\u6253\u5f00\uff0c\u5982\u679c\u6ca1\u6709\u8fd9\u4e2a\u5bc6\u7801\uff0c\u4f60\u5c31\u770b\u4e0d\u4e86\u91cc\u9762\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<p>\u6587\u4ef6\u52a0\u5bc6\u4e4b\u540e\u6211\u4eec\u5c31\u53ef\u4ee5\u628a\u6587\u4ef6\u5b58\u5728\u4e00\u4e9b\u516c\u5f00\u7684\u7f51\u76d8\u91cc\u9762\uff0c\u6216\u8005\u5206\u4eab\u7ed9\u5176\u4ed6\u4eba\uff0c\u7136\u540e\u522b\u4eba\u901a\u8fc7\u5bc6\u7801\u5c31\u53ef\u4ee5\u770b\u4e86\uff0c\u5982\u679c\u6ca1\u6709\u5bc6\u7801\uff0c\u5c31\u7b97\u522b\u4eba\u5f97\u5230\u6587\u4ef6\u4e5f\u65e0\u6cd5\u77e5\u6653\u91cc\u9762\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/pjq.me\/?p=2474\/#Blocker_Cipher%E5%88%86%E7%BB%84%E5%8A%A0%E5%AF%86\" >Blocker Cipher(\u5206\u7ec4\u52a0\u5bc6)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/pjq.me\/?p=2474\/#DESData_Encryption_Standard\" >DES(Data Encryption Standard)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/pjq.me\/?p=2474\/#AESAdvanced_Encryption_Standard\" >AES(Advanced Encryption Standard)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/pjq.me\/?p=2474\/#AES_%E2%80%93_ECB\" >AES &#8211; ECB<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/pjq.me\/?p=2474\/#AES_%E2%80%93_CBC\" >AES &#8211; CBC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/pjq.me\/?p=2474\/#AEC_%E2%80%93_CTR\" >AEC &#8211; CTR<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/pjq.me\/?p=2474\/#AES_%E2%80%93_GCM\" >AES &#8211; GCM<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/pjq.me\/?p=2474\/#MAC%E4%B8%8EHMAC\" >MAC\u4e0eHMAC<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Blocker_Cipher%E5%88%86%E7%BB%84%E5%8A%A0%E5%AF%86\"><\/span>Blocker Cipher(\u5206\u7ec4\u52a0\u5bc6)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4e00\u4e2a\u6587\u4ef6\u53ef\u80fd\u5f88\u5927\uff0c\u6240\u4ee5\u5bc6\u7801\u5b66\u4e0a\u4e00\u822c\u4f1a\u628a\u5185\u5bb9\u8fdb\u884c\u56fa\u5b9a\u957f\u5ea6\u7684\u5207\u5272\uff0c\u7136\u540e\u4e00\u5757\u5185\u5bb9\u4e00\u5757\u5185\u5bb9\u8fdb\u884c\u52a0\u5bc6\uff0c\u8fd9\u4e2a\u5c31\u662f\u5206\u7ec4\u52a0\u5bc6\uff0c\u4e0e\u4e4b\u5bf9\u5e94\u7684\u5c31\u662f\u6d41\u52a0\u5bc6(Steam Cipher)\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DESData_Encryption_Standard\"><\/span>DES(Data Encryption Standard)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>DES(Data Encryption Standard), \u5b831977\u5e74\u6210\u4e3a\u6807\u51c6\u3002\u8fd9\u4e2a\u540d\u5b57\u770b\u8d77\u6765\u5f88\u9ad8\u7ea7\uff0c\u5176\u5b9e\u73b0\u5728\u5df2\u7ecf\u4e0d\u7528\u4e86\uff0c\u751a\u81f3\u8bf4\u7981\u6b62\u4f7f\u7528\uff0c\u56e0\u4e3a\u968f\u7740\u8ba1\u7b97\u673a\u7b97\u529b\u7684\u4e0d\u65ad\u53d1\u5c55\uff0c\u5b8356\u4f4d\u7684\u5bc6\u7801\u957f\u5ea6\u5f88\u5bb9\u6613\u5c31\u88ab\u7206\u7834\u51fa\u6765(Brute Force)\uff0c1999\u5e74\u5c31\u88ab\u7206\u7834\u4e86\uff0c\u4f46\u5728\u4e00\u6bb5\u65f6\u95f4\u4e4b\u5185\uff0c\u5b83\u5c31\u662f\u6807\u51c6\u7684\u5bc6\u7801\u52a0\u5bc6\u7b97\u6cd5\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>https:\/\/en.wikipedia.org\/wiki\/Data_Encryption_Standard<\/li>\n<\/ul>\n\n\n\n<p>\u5b83\u7684\u6d41\u7a0b\u5982\u4e0b\u56fe\uff0c\u57fa\u4e8eFeistel Network\u7ed3\u6784\uff0c16\u8f6e\u8fd0\u7b97\uff0cBlock Size 64\u4f4d\uff0c\u5206\u4e3a\u5de6\u53f3\u540432\u4f4d\uff0c\u7136\u540e\u8fdb\u884c16\u8f6e\u8fd0\u7b97\uff0c\u6bcf\u8f6e\u8fd0\u7b97\u5c31\u90fd\u4f7f\u7528\u4e0d\u540c\u7684\u5bc6\u7801(KDF,\u968f\u79f0\u5bc6\u94a5\u6d3e\u751f, Key Derivation Function)\uff0c\u6700\u540e\u8f93\u51fa\u540c\u7b49\u957f\u5ea6\u768464\u4f4d\u5bc6\u6587\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"394\" height=\"558\" src=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-7.png\" alt=\"\" class=\"wp-image-2475\" srcset=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-7.png 394w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-7-212x300.png 212w\" sizes=\"auto, (max-width: 394px) 100vw, 394px\" \/><\/figure>\n\n\n\n<p>\u540e\u9762\u8fd8\u67093DES\uff0c \u5c31\u662f\u8fdb\u8fc7\u4e09\u8f6eDES\u52a0\u5bc6\uff0c\u56e0\u4e3a\u5bc6\u7801\u957f\u5ea6\u59cb\u7ec8\u53ea\u670956\u4f4d\uff0c\u6240\u4ee5\u4e5f\u88ab\u6dd8\u6c70\u4e86\u3002<\/p>\n\n\n\n<p>\u8fd9\u6837\u5c31\u4e0d\u5f97\u4e0d\u5bfb\u6c42\u65b0\u7684\u52a0\u5bc6\u65b9\u5f0f<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AESAdvanced_Encryption_Standard\"><\/span>AES(Advanced Encryption Standard)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u968f\u7740DES\u7684\u5b89\u5168\u6027\u8d8a\u6765\u8d8a\u5f31\uff0c\u7f8e\u56fdNIST\u57281997\u5e74\u53d1\u8d77\u4e86\u65b0\u7684\u52a0\u5bc6\u7b97\u6cd5\u7684\u7ade\u7b97\uff0c\u7ecf\u8fc7\u591a\u8f6e\u6311\u6218\uff0c\u6700\u7ec8Rijndael\u7b97\u6cd5\u88ab\u9009\u81eaAES\u6807\u51c6\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>https:\/\/en.wikipedia.org\/wiki\/Advanced_Encryption_Standard_process<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"533\" height=\"170\" src=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-8.png\" alt=\"\" class=\"wp-image-2476\" style=\"width:690px;height:auto\" srcset=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-8.png 533w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-8-300x96.png 300w\" sizes=\"auto, (max-width: 533px) 100vw, 533px\" \/><\/figure>\n\n\n\n<p>\u6240\u4ee5\u57282001\u5e74\uff0cRijndael\u88ab\u5f53\u505a\u6807\u51c6\uff0c\u6210\u4e3aAES\u7b97\u6cd5\uff0c\u8fd9\u91cc\u6709\u5f53\u5e74AES\u6210\u4e3a\u6807\u51c6\u7684\u63d0\u6848\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/csrc.nist.gov\/csrc\/media\/projects\/cryptographic-standards-and-guidelines\/documents\/aes-development\/rijndael-ammended.pdf#page=3\">https:\/\/csrc.nist.gov\/csrc\/media\/projects\/cryptographic-standards-and-guidelines\/documents\/aes-development\/rijndael-ammended.pdf#page=3<\/a><\/li>\n<\/ul>\n\n\n\n<p>\u6700\u7ec8\u9009\u53d6<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Block size: 128\u4f4d<\/li>\n\n\n\n<li>Key size: 128, 192, 256\u4f4d<\/li>\n\n\n\n<li>\u7ed3\u6784\u7f51\u7edc\uff1aSPN(Substitution Permutation Network)\n<ul class=\"wp-block-list\">\n<li>10\/12\/14\u8f6e\u8fd0\u7b97(\u5206\u522b\u5bf9\u5e94\u7684\u5bc6\u7801\u957f\u5ea6128, 192, 256\u4f4d)<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>\u5927\u81f4\u8fc7\u7a0b\u5982\u4e0b\u56fe\uff0c\u4e3b\u8981\u6b65\u9aa4\u6709<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5bc6\u7801\u6269\u5c55(Key Expansion)\uff0c\u5206\u522b\u751f\u621010\u8f6e\u5bc6\u94a5<\/li>\n\n\n\n<li>\u521d\u59cb\u8fc7\u7a0b(\u76f4\u63a5\u660e\u6587 XOR Key)<\/li>\n\n\n\n<li>\u7136\u540e9\u8f6e\u8fed\u4ee3\n<ul class=\"wp-block-list\">\n<li>\u5b57\u8282\u66ff\u6362(<a href=\"https:\/\/en.wikipedia.org\/wiki\/Rijndael_S-box\">S-Box<\/a>\u66ff\u6362)<\/li>\n\n\n\n<li>\u884c\u4f4d\u79fb(Left Shift)<\/li>\n\n\n\n<li>\u5217\u6df7\u6dc6(\u5f88\u590d\u6742\uff01\uff01\uff01)<\/li>\n\n\n\n<li>\u8f6e\u5bc6\u7801\u52a0(XOR Key n)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u6700\u540e\u4e00\u8f6e\n<ul class=\"wp-block-list\">\n<li>\u5b57\u8282\u66ff\u6362<\/li>\n\n\n\n<li>\u884c\u4f4d\u79fb<\/li>\n\n\n\n<li>\u8f6e\u5bc6\u7801\u52a0<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"491\" src=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-9-1024x491.png\" alt=\"\" class=\"wp-image-2478\" srcset=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-9-1024x491.png 1024w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-9-300x144.png 300w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-9-768x368.png 768w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-9.png 1102w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u6574\u4e2a\u8fc7\u7a0b\uff0c\u8bf4\u7b80\u5355\u4e5f\u7b80\u5355\uff0c\u8bf4\u8d1f\u6742\u4e5f\u8d1f\u6742\uff0c\u53cd\u6b63\u7ecf\u5e38\u4e00\u901a\u5404\u79cd\u8f6c\u6362\uff0c\u751f\u6210\u52a0\u5bc6\u4e4b\u540e\u7684\u7ed3\u679c\uff1a\u5bc6\u6587\u3002<\/p>\n\n\n\n<p>\u8fd9\u5c31\u662f\u7b80\u5355\u7684AES \u52a0\u5bc6\u7684\u6574\u4e2a\u8fc7\u7a0b\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AES_%E2%80%93_ECB\"><\/span>AES &#8211; ECB<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4e4b\u524d\u8bf4\u8fc7AES\u662fBlock Cipher\u4e5f\u5c31\u662f\u5757\u52a0\u5bc6\uff0c\u5b83\u9700\u8981\u628a\u5185\u5bb9\u5206\u6210\u5757\u52a0\u5bc6\uff0c\u6240\u4ee5\u6211\u4eec\u6700\u5bb9\u6613\u60f3\u5230\u7684\u5c31\u662f\uff0c\u5207\u5757\u4e4b\u540e\uff0c\u6bcf\u4e2a\u5757\u5355\u72ec\u8fdb\u884c\u52a0\u5bc6\uff0c\u8fd9\u4e2a\u65b9\u5f0f\u5462\u5c31\u662fECB\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p>\u5982\u4e0b\u56fe\u6240\u793a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"712\" height=\"401\" src=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-10.png\" alt=\"\" class=\"wp-image-2479\" srcset=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-10.png 712w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-10-300x169.png 300w\" sizes=\"auto, (max-width: 712px) 100vw, 712px\" \/><\/figure>\n\n\n\n<p>\u4f46\u662f\u5b83\u6709\u4e2a\u81f4\u547d\u7684\u7f3a\u70b9\uff0c\u5c31\u662f\u76f8\u540c\u7684\u660e\u6587\uff0c\u52a0\u5bc6\u4e4b\u540e\u7684\u5bc6\u6587\u662f\u4e00\u6837\u7684\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u6211\u4eec\u5c31\u8981\u796d\u51fa\u4e0b\u9762\u8fd9\u5f20\u56fe\u7247\u4e86\uff0c\u5de6\u8fb9\u662f\u539f\u56fe\uff0c\u4e2d\u95f4\u662f\u7ecf\u5e38AES\u52a0\u5bc6\u4e4b\u540e\u7684\u7ed3\u679c\u3002\u5f88\u660e\u663e\u867d\u7136\u52a0\u5bc6\u4e86\uff0c\u4f46\u6211\u4eec\u8fd8\u662f\u53ef\u4ee5\u770b\u5230\u56fe\u7247\u7684\u5927\u6982\u5185\u5bb9\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"951\" height=\"450\" src=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-12.png\" alt=\"\" class=\"wp-image-2481\" srcset=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-12.png 951w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-12-300x142.png 300w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-12-768x363.png 768w\" sizes=\"auto, (max-width: 951px) 100vw, 951px\" \/><\/figure>\n\n\n\n<p>\u6240\u4ee5\u5b9e\u9645\u4e0a\uff0c\u8fd9\u79cd\u65b9\u5f0f\u662f\u4e0d\u80fd\u4f7f\u7528\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AES_%E2%80%93_CBC\"><\/span>AES &#8211; CBC<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u770b\u4e86\u4e4b\u524d\u7684ECB\u6a21\u5f0f\uff0c\u53d1\u73b0\u95ee\u9898\uff0c\u6240\u4ee5\u8fd9\u91cc\u6211\u4eec\u5e0c\u671b\u5f15\u5165\u4e00\u4e9b\u968f\u673a\u6027(IV), \u8fd9\u6837\u52a0\u5bc6\u51fa\u6765\u7684\u7ed3\u679c\u5c31\u4e0d\u4f1a\u50cfECB\u6a21\u5f0f\u90a3\u6837\u4e86\u3002<\/p>\n\n\n\n<p>\u5982\u4e0b\u56fe\u5c31\u662fCBC\u6a21\u5f0f\uff0c\u5f15\u5165\u521d\u59cb\u5411\u91cf\uff0c\u7136\u540e\u6bcf\u6b21\u7684\u5bc6\u6587\u90fd\u505a\u4e3a\u4e0b\u4e00\u4e2a\u52a0\u5bc6\u7684IV\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u4ea7\u751f\u66f4\u591a\u7684\u968f\u673a\u6027\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"702\" height=\"433\" src=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-13.png\" alt=\"\" class=\"wp-image-2482\" srcset=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-13.png 702w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-13-300x185.png 300w\" sizes=\"auto, (max-width: 702px) 100vw, 702px\" \/><\/figure>\n\n\n\n<p>\u5f53\u7136\u5b83\u4e5f\u6709\u4e2a\u95ee\u9898\uff0c\u4e0d\u80fd\u5e76\u884c\u8fd0\u7b97\uff0c\u53ea\u80fd\u4e32\u884c\uff0c\u5982\u679c\u9700\u8981\u5f88\u5feb\u7684\u52a0\u5bc6\uff0c\u90a3\u8fd9\u79cd\u65b9\u5f0f\u663e\u793a\u5c31\u4e0d\u5408\u7406\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AEC_%E2%80%93_CTR\"><\/span>AEC &#8211; CTR<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>CTR\u8ba1\u6570\u5668\u6a21\u5f0f\uff0c\u8fd9\u4e2a\u6a21\u5f0f\u6709\u70b9\u50cf\u6d41\u52a0\u5bc6(Stream Cipher), \u5f15\u5165\u4e00\u4e2a\u968f\u673a\u6570(Nonce), \u7136\u540e\u5c31\u5f15\u5165\u4e2a\u8ba1\u6570\u5668 0000, 0001, 0002, 000N<\/p>\n\n\n\n<p>CTR\u6a21\u5f0f\u52a0\u5bc6\u662f\u8fd9\u4e2a\u968f\u673a\u6570+Counter, \u7136\u540e\u518d\u548c\u660e\u6587\u8fdb\u884c XOR\u3002\u6240\u4ee5\u5b83\u89e3\u51b3\u4e86\u4e0a\u9762CBC\u6a21\u5f0f\u4e0d\u80fd\u5e76\u884c\u8fd0\u7b97\u7684\u95ee\u9898\uff0c\u7136\u540e\u4e5f\u8db3\u591f\u968f\u673a\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"731\" height=\"281\" src=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-14.png\" alt=\"\" class=\"wp-image-2483\" srcset=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-14.png 731w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-14-300x115.png 300w\" sizes=\"auto, (max-width: 731px) 100vw, 731px\" \/><\/figure>\n\n\n\n<p>\u4f46\u8fd9\u91cc\u4e5f\u6709\u4e00\u4e2a\u95ee\u9898\uff0c\u5c31\u662f\u4e00\u5b9a\u8981\u786e\u4fdd\u968f\u673a\u6570\u662f\u771f\u7684\u968f\u673a\uff0c\u4e0d\u8981\u590d\u7528\uff0c\u6bcf\u6b21\u90fd\u751f\u6210\u65b0\u7684\u968f\u673a\u6570\u3002<\/p>\n\n\n\n<p>M1, M2\u662f\u4e24\u4e2a\u660e\u6587\uff0cC1, C2\u662f\u901a\u8fc7CTR\u6a21\u5f0f\u52a0\u5bc6\u7684\u5bc6\u6587\uff0c\u9ed1\u5ba2\u53ef\u4ee5\u62e6\u622aC1, C2\uff0c  \u7136\u540e\u60f3\u529e\u6cd5\u63a8\u5bfc\u51fa\u660e\u6587<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>C1=M1 XOR K\nC2=M2 XOR K\nC1 XOR C2 = M1 XOR K XOR M2 XOR K = M1 XOR M2<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u6211\u4eec\u77e5\u9053M1\uff0c\u90a3\u5c31\u5f88\u5bb9\u6613\u63a8\u5bfc\u51faM2\uff0c \u5c31\u7b97\u4e0d\u77e5\u9053M1\uff0c\u4e5f\u80fd\u901a\u8fc7\u67d0\u4e9b\u89c4\u5f8b\u63a8\u8350\u51fa\u660e\u6587\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5CTR\u6a21\u5f0f\u4e00\u5b9a\u8981\u786e\u4fdd\u968f\u673a\u6570\u7684\u552f\u4e00\u6027\uff0c\u7edd\u5bf9\u4e0d\u8981\u91cd\u590d\u3002<\/p>\n\n\n\n<p>\u8fd8\u6709CTR\u6a21\u5f0f\u4e0d\u9700\u8981padding, \u56e0\u4e3a\u5b83\u6700\u7ec8\u7684\u64cd\u4f5c\u662f XOR, \u4e0d\u7528\u5bf9\u660e\u6587\u8fdb\u884c\u8865\u5168\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AES_%E2%80%93_GCM\"><\/span>AES &#8211; GCM<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>GCM\u6a21\u5f0f\u5e94\u8be5\u662f\u5f53\u524d\u6700\u63a8\u8350\u7684\u6a21\u5f0f\uff0c\u5b83\u5373\u6709CTR\u6a21\u5f0f\u7684\u968f\u673a\u6027(Nonce + Counter), \u53c8\u53e0\u52a0\u4e86\u8ba4\u8bc1\u4fe1\u606f\uff0c\u9632\u7be1\u6539\uff0c\u4e5f\u5c31\u662f<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u009f1. \u4fdd\u5bc6\u6027 Confidentiality<\/li>\n\n\n\n<li>\u009f2. \u5b8c\u6574\u6027 Integrity<\/li>\n<\/ul>\n\n\n\n<p>\u770b\u4e0b\u9762\u8fd9\u4e2a\u56fe\uff0c\u5b83\u5f15\u5165\u66f4\u590d\u6742\u7684\u8fd0\u7b97\u65b9\u5f0f\uff0c\u628a\u660e\u6587\u5bc6\u6587\u5404\u4e2a\u90e8\u5206\u90fd\u8fdb\u884c\u4e86\u8fde\u63a5\uff0c\u7b97\u51fa\u4e86\u4e00\u4e2aAuth Tag, \u8fd9\u6837\u5c31\u8981\u5185\u5bb9\u88ab\u7be1\u6539\uff0c\u5c31\u80fd\u7acb\u523b\u77e5\u9053\uff0c\u76f4\u63a5\u4e22\u5f03\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"443\" height=\"486\" src=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-15.png\" alt=\"\" class=\"wp-image-2484\" srcset=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-15.png 443w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-15-273x300.png 273w\" sizes=\"auto, (max-width: 443px) 100vw, 443px\" \/><\/figure>\n\n\n\n<p>\u6240\u4ee5\u73b0\u5728AES\u6700\u63a8\u8350\u65b9\u5f0f\u662fGCM\u6a21\u5f0f\uff0c\u5f53\u7136\u5b83\u80fd\u63d0\u9ad8\u5b89\u5168\u4fdd\u5bc6\u7ea7\u522b\uff0c\u610f\u5473\u7740\u4e5f\u9700\u8981\u6d88\u8017\u66f4\u591a\u7684\u7b97\u529b\uff0c\u9700\u8981\u66f4\u957f\u65f6\u95f4\u7684\u8fd0\u884c\uff0c\u6240\u4ee5\u8fd9\u4e2a\u5c31\u53d6\u51b3\u4e8e\u6211\u4eec\u9700\u8981\u54ea\u4e2a\u7ea7\u522b\u7684\u52a0\u5bc6\u65b9\u5f0f\u3002\u5f53\u524dGCM\u4e5f\u662f\u4e1a\u529b\u6700\u63a8\u8350\u7684\u65b9\u5f0f\uff0c\u6bd4\u5982TLS1.3\u91cc\u9762<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>https:\/\/owasp.org\/www-chapter-london\/assets\/slides\/OWASPLondon20180125_TLSv1.3_Andy_Brodie.pdf<\/li>\n<\/ul>\n\n\n\n<p>\u5728TLS1.3\u91cc\u9762GCM, CCM\u90fd\u662f\u63a8\u8350\u7684\u65b9\u5f0f<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"759\" src=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-16-1024x759.png\" alt=\"\" class=\"wp-image-2485\" srcset=\"https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-16-1024x759.png 1024w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-16-300x222.png 300w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-16-768x569.png 768w, https:\/\/pjq.me\/wp-content\/uploads\/2025\/11\/image-16.png 1273w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"MAC%E4%B8%8EHMAC\"><\/span>MAC\u4e0eHMAC<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u867d\u7136\u6211\u4eec\u6709\u4e86AES\u52a0\u5bc6\uff0c\u4f46\u4e3a\u4e86\u786e\u4fdd\u52a0\u5bc6\u4fe1\u606f\u6ca1\u6709\u4e0d\u7be1\u6539\u8fc7\uff0c\u5c31\u6709\u5f15\u5165\u6d88\u606f\u8ba4\u8bc1\u7801MAC, \u5b83\u901a\u8fc7\u79c1\u94a5\u5bf9\u660e\u6587\u6d88\u606f\u8fdb\u884chash\u8fd0\u7b97<\/p>\n\n\n\n<p>MAC=Hash(K\u2161M)<\/p>\n\n\n\n<p>\u4f46\u7531\u4e8ehash\u8fd0\u7b97\u6bcf\u4e00\u6b65\u90fd\u662f\u786e\u5b9a\u7684\uff0c\u6240\u4ee5\u7ed9\u4e86\u9ed1\u5ba2\u5728\u4e0d\u77e5\u9053\u79c1\u94a5\u7684\u60c5\u51b5\u4e0b\uff0c\u5bf9\u539f\u6d88\u606f\u548cMAC\u8fdb\u884c\u7be1\u6539\u800c\u4e0d\u88ab\u670d\u52a1\u5668\u53d1\u73b0\uff0c\u8fd9\u4e2a\u653b\u51fb\u53ebLength Extension Attack.  \u50cf\u4ee5\u524d\u7ecf\u5e38\u4f1a\u5bf9API\u53c2\u6570\u7528\u79c1\u94a5\u52a0\u4e0a\u4e00\u4e2a\u7b7e\u540d\u751f\u6210\u4e00\u4e2aMAC\uff0c\u4f46\u5b9e\u9645\u8fd9\u79cd\u65b9\u5f0f\u7ed9\u4e86\u7ed9\u4e2a\u653b\u51fb\u7684\u673a\u4f1a\uff0c\u6240\u4ee5\u8fd9\u4e2a\u6f0f\u6d1e\u53d1\u73b0\u4e4b\u540e\u5c31\u7981\u6b62\u4f7f\u7528\u7b80\u5355\u7684\u5355\u6b21hash \u751f\u6210\u7684MAC\uff0c\u800c\u6539\u4e3aHMAC\uff0c\u5b83\u7684\u8ba1\u7b97\u8fc7\u7a0b\u8bbe\u8ba1\u4e86\u66f4\u591a\u7684\u968f\u673a\u7ec4\u5408\u52a0\u4e0a\u4e24\u6b21hash \u8fd0\u7b97\uff0c\u76f4\u63a5\u5835\u6b7b\u4e86\u7531\u4e8e\u5355\u6b21hash\u8fd0\u7b97\u5e26\u6765\u7684\u72b6\u6001\u786e\u5b9a\u6027\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u7528HMAC\u5c31\u662f\u6211\u4eec\u9a8c\u8bc1\u6d88\u606f\u5b8c\u6574\u6027\u548c\u8ba4\u8bc1\u6027\u7684\u89e3\u51b3\u65b9\u6848\u4e86\u3002<\/p>\n\n\n\n<p>\u5bf9\u79f0\u52a0\u5bc6\u7b80\u5355\u7684\u4ecb\u7ecd\u5c31\u5230\u8fd9\u91cc\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e4b\u524d\u4e00\u7bc7\u6587\u7ae0\u8bb2\u8fc7\u53e4\u5178\u5bc6\u7801\u5b66\u3002 \u8fd9\u7bc7\u6587\u7ae0\u6211\u4eec\u6765\u804a\u4e00\u4e0b\u5bf9\u79f0\u52a0\u5bc6(Symmetric Encryption)\u3002 \u8fd9\u4e2a\u540d\u5b57\u5176\u5b9e\u6709\u70b9\u552c\u4eba\uff0c\u7b80\u5355\u8bf4\u5c31\u662f\u53ea\u9700\u8981\u4e00\u628a\u94a5\u5319\u53ef\u4ee5\u7528\u6765\u628a\u6587\u4ef6\u52a0\u5bc6\uff0c\u7136\u540e\u89e3\u5bc6\u4e5f\u662f\u540c\u4e00\u628a\u94a5\u5319\u3002 \u6bd4\u5982\u8bf4\u6211\u4eec\u8981\u5bf9PDF\u8fdb\u884c\u52a0\u5bc6\uff0c\u90a3\u5c31\u4f1a\u6709\u9700\u8981\u540c\u4e00\u4e2a\u5bc6\u7801\u8fdb\u884c\u6253\u5f00\uff0c\u5982\u679c\u6ca1\u6709\u8fd9\u4e2a\u5bc6\u7801\uff0c\u4f60\u5c31\u770b\u4e0d\u4e86\u91cc\u9762\u7684\u5185\u5bb9\u3002 \u6587\u4ef6\u52a0\u5bc6\u4e4b\u540e\u6211\u4eec\u5c31\u53ef\u4ee5\u628a\u6587\u4ef6\u5b58\u5728\u4e00\u4e9b\u516c\u5f00\u7684\u7f51\u76d8\u91cc\u9762\uff0c\u6216\u8005\u5206\u4eab\u7ed9\u5176\u4ed6\u4eba\uff0c\u7136\u540e\u522b\u4eba\u901a\u8fc7\u5bc6\u7801\u5c31\u53ef\u4ee5\u770b\u4e86\uff0c\u5982\u679c\u6ca1\u6709\u5bc6\u7801\uff0c\u5c31\u7b97\u522b\u4eba\u5f97\u5230\u6587\u4ef6\u4e5f\u65e0\u6cd5\u77e5\u6653\u91cc\u9762\u7684\u5185\u5bb9\u3002 Blocker Cipher(\u5206\u7ec4\u52a0\u5bc6) \u4e00\u4e2a\u6587\u4ef6\u53ef\u80fd\u5f88\u5927\uff0c\u6240\u4ee5\u5bc6\u7801\u5b66\u4e0a\u4e00\u822c\u4f1a\u628a\u5185\u5bb9\u8fdb\u884c\u56fa\u5b9a\u957f\u5ea6\u7684\u5207\u5272\uff0c\u7136\u540e\u4e00\u5757\u5185\u5bb9\u4e00\u5757\u5185\u5bb9\u8fdb\u884c\u52a0\u5bc6\uff0c\u8fd9\u4e2a\u5c31\u662f\u5206\u7ec4\u52a0\u5bc6\uff0c\u4e0e\u4e4b\u5bf9\u5e94\u7684\u5c31\u662f\u6d41\u52a0\u5bc6(Steam Cipher)\u3002 DES(Data Encryption Standard) DES(Data Encryption Standard), \u5b831977\u5e74\u6210\u4e3a\u6807\u51c6\u3002\u8fd9\u4e2a\u540d\u5b57\u770b\u8d77\u6765\u5f88\u9ad8\u7ea7\uff0c\u5176\u5b9e\u73b0\u5728\u5df2\u7ecf\u4e0d\u7528\u4e86\uff0c\u751a\u81f3\u8bf4\u7981\u6b62\u4f7f\u7528\uff0c\u56e0\u4e3a\u968f\u7740\u8ba1\u7b97\u673a\u7b97\u529b\u7684\u4e0d\u65ad\u53d1\u5c55\uff0c\u5b8356\u4f4d\u7684\u5bc6\u7801\u957f\u5ea6\u5f88\u5bb9\u6613\u5c31\u88ab\u7206\u7834\u51fa\u6765(Brute Force)\uff0c1999\u5e74\u5c31\u88ab\u7206\u7834\u4e86\uff0c\u4f46\u5728\u4e00\u6bb5\u65f6\u95f4\u4e4b\u5185\uff0c\u5b83\u5c31\u662f\u6807\u51c6\u7684\u5bc6\u7801\u52a0\u5bc6\u7b97\u6cd5\u3002 \u5b83\u7684\u6d41\u7a0b\u5982\u4e0b\u56fe\uff0c\u57fa\u4e8eFeistel Network\u7ed3\u6784\uff0c16\u8f6e\u8fd0\u7b97\uff0cBlock Size 64\u4f4d\uff0c\u5206\u4e3a\u5de6\u53f3\u540432\u4f4d\uff0c\u7136\u540e\u8fdb\u884c16\u8f6e\u8fd0\u7b97\uff0c\u6bcf\u8f6e\u8fd0\u7b97\u5c31\u90fd\u4f7f\u7528\u4e0d\u540c\u7684\u5bc6\u7801(KDF,\u968f\u79f0\u5bc6\u94a5\u6d3e\u751f, Key Derivation Function)\uff0c\u6700\u540e\u8f93\u51fa\u540c\u7b49\u957f\u5ea6\u768464\u4f4d\u5bc6\u6587\u3002 \u540e\u9762\u8fd8\u67093DES\uff0c \u5c31\u662f\u8fdb\u8fc7\u4e09\u8f6eDES\u52a0\u5bc6\uff0c\u56e0\u4e3a\u5bc6\u7801\u957f\u5ea6\u59cb\u7ec8\u53ea\u670956\u4f4d\uff0c\u6240\u4ee5\u4e5f\u88ab\u6dd8\u6c70\u4e86\u3002 \u8fd9\u6837\u5c31\u4e0d\u5f97\u4e0d\u5bfb\u6c42\u65b0\u7684\u52a0\u5bc6\u65b9\u5f0f AES(Advanced Encryption Standard) \u968f\u7740DES\u7684\u5b89\u5168\u6027\u8d8a\u6765\u8d8a\u5f31\uff0c\u7f8e\u56fdNIST\u57281997\u5e74\u53d1\u8d77\u4e86\u65b0\u7684\u52a0\u5bc6\u7b97\u6cd5\u7684\u7ade\u7b97\uff0c\u7ecf\u8fc7\u591a\u8f6e\u6311\u6218\uff0c\u6700\u7ec8Rijndael\u7b97\u6cd5\u88ab\u9009\u81eaAES\u6807\u51c6\u3002 \u6240\u4ee5\u57282001\u5e74\uff0cRijndael\u88ab\u5f53\u505a\u6807\u51c6\uff0c\u6210\u4e3aAES\u7b97\u6cd5\uff0c\u8fd9\u91cc\u6709\u5f53\u5e74AES\u6210\u4e3a\u6807\u51c6\u7684\u63d0\u6848\u3002 \u6700\u7ec8\u9009\u53d6 \u5927\u81f4\u8fc7\u7a0b\u5982\u4e0b\u56fe\uff0c\u4e3b\u8981\u6b65\u9aa4\u6709 \u6574\u4e2a\u8fc7\u7a0b\uff0c\u8bf4\u7b80\u5355\u4e5f\u7b80\u5355\uff0c\u8bf4\u8d1f\u6742\u4e5f\u8d1f\u6742\uff0c\u53cd\u6b63\u7ecf\u5e38\u4e00\u901a\u5404\u79cd\u8f6c\u6362\uff0c\u751f\u6210\u52a0\u5bc6\u4e4b\u540e\u7684\u7ed3\u679c\uff1a\u5bc6\u6587\u3002 \u8fd9\u5c31\u662f\u7b80\u5355\u7684AES \u52a0\u5bc6\u7684\u6574\u4e2a\u8fc7\u7a0b\u4e86\u3002 AES &#8211;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[270,169],"tags":[246,249,228,250,248,251,253,252,247],"class_list":["post-2474","post","type-post","status-publish","format-standard","hentry","category-cryptography","category-tech","tag-aes","tag-cbc","tag-cryptography","tag-ctr","tag-ecb","tag-gcm","tag-hmac","tag-mac","tag-symmetric"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u5bc6\u7801\u5b66(Cryptography)\u7b80\u53f2-\u5bf9\u79f0\u52a0\u5bc6(Symmetric Encryption) - Jianqing&#039;s Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pjq.me\/?p=2474\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5bc6\u7801\u5b66(Cryptography)\u7b80\u53f2-\u5bf9\u79f0\u52a0\u5bc6(Symmetric Encryption) - Jianqing&#039;s Blog\" \/>\n<meta property=\"og:description\" content=\"\u4e4b\u524d\u4e00\u7bc7\u6587\u7ae0\u8bb2\u8fc7\u53e4\u5178\u5bc6\u7801\u5b66\u3002 \u8fd9\u7bc7\u6587\u7ae0\u6211\u4eec\u6765\u804a\u4e00\u4e0b\u5bf9\u79f0\u52a0\u5bc6(Symmetric Encryption)\u3002 \u8fd9\u4e2a\u540d\u5b57\u5176\u5b9e\u6709\u70b9\u552c\u4eba\uff0c\u7b80\u5355\u8bf4\u5c31\u662f\u53ea\u9700\u8981\u4e00\u628a\u94a5\u5319\u53ef\u4ee5\u7528\u6765\u628a\u6587\u4ef6\u52a0\u5bc6\uff0c\u7136\u540e\u89e3\u5bc6\u4e5f\u662f\u540c\u4e00\u628a\u94a5\u5319\u3002 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\u4e00\u4e2a\u6587\u4ef6\u53ef\u80fd\u5f88\u5927\uff0c\u6240\u4ee5\u5bc6\u7801\u5b66\u4e0a\u4e00\u822c\u4f1a\u628a\u5185\u5bb9\u8fdb\u884c\u56fa\u5b9a\u957f\u5ea6\u7684\u5207\u5272\uff0c\u7136\u540e\u4e00\u5757\u5185\u5bb9\u4e00\u5757\u5185\u5bb9\u8fdb\u884c\u52a0\u5bc6\uff0c\u8fd9\u4e2a\u5c31\u662f\u5206\u7ec4\u52a0\u5bc6\uff0c\u4e0e\u4e4b\u5bf9\u5e94\u7684\u5c31\u662f\u6d41\u52a0\u5bc6(Steam Cipher)\u3002 DES(Data Encryption Standard) DES(Data Encryption Standard), \u5b831977\u5e74\u6210\u4e3a\u6807\u51c6\u3002\u8fd9\u4e2a\u540d\u5b57\u770b\u8d77\u6765\u5f88\u9ad8\u7ea7\uff0c\u5176\u5b9e\u73b0\u5728\u5df2\u7ecf\u4e0d\u7528\u4e86\uff0c\u751a\u81f3\u8bf4\u7981\u6b62\u4f7f\u7528\uff0c\u56e0\u4e3a\u968f\u7740\u8ba1\u7b97\u673a\u7b97\u529b\u7684\u4e0d\u65ad\u53d1\u5c55\uff0c\u5b8356\u4f4d\u7684\u5bc6\u7801\u957f\u5ea6\u5f88\u5bb9\u6613\u5c31\u88ab\u7206\u7834\u51fa\u6765(Brute Force)\uff0c1999\u5e74\u5c31\u88ab\u7206\u7834\u4e86\uff0c\u4f46\u5728\u4e00\u6bb5\u65f6\u95f4\u4e4b\u5185\uff0c\u5b83\u5c31\u662f\u6807\u51c6\u7684\u5bc6\u7801\u52a0\u5bc6\u7b97\u6cd5\u3002 \u5b83\u7684\u6d41\u7a0b\u5982\u4e0b\u56fe\uff0c\u57fa\u4e8eFeistel Network\u7ed3\u6784\uff0c16\u8f6e\u8fd0\u7b97\uff0cBlock Size 64\u4f4d\uff0c\u5206\u4e3a\u5de6\u53f3\u540432\u4f4d\uff0c\u7136\u540e\u8fdb\u884c16\u8f6e\u8fd0\u7b97\uff0c\u6bcf\u8f6e\u8fd0\u7b97\u5c31\u90fd\u4f7f\u7528\u4e0d\u540c\u7684\u5bc6\u7801(KDF,\u968f\u79f0\u5bc6\u94a5\u6d3e\u751f, Key Derivation Function)\uff0c\u6700\u540e\u8f93\u51fa\u540c\u7b49\u957f\u5ea6\u768464\u4f4d\u5bc6\u6587\u3002 \u540e\u9762\u8fd8\u67093DES\uff0c \u5c31\u662f\u8fdb\u8fc7\u4e09\u8f6eDES\u52a0\u5bc6\uff0c\u56e0\u4e3a\u5bc6\u7801\u957f\u5ea6\u59cb\u7ec8\u53ea\u670956\u4f4d\uff0c\u6240\u4ee5\u4e5f\u88ab\u6dd8\u6c70\u4e86\u3002 \u8fd9\u6837\u5c31\u4e0d\u5f97\u4e0d\u5bfb\u6c42\u65b0\u7684\u52a0\u5bc6\u65b9\u5f0f AES(Advanced Encryption Standard) 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