{"id":191,"date":"2026-04-07T23:11:24","date_gmt":"2026-04-07T15:11:24","guid":{"rendered":"https:\/\/www.sherlock666.cn\/?p=191"},"modified":"2026-04-07T23:11:24","modified_gmt":"2026-04-07T15:11:24","slug":"des%e7%ae%97%e6%b3%95%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.sherlock666.cn\/index.php\/2026\/04\/07\/des%e7%ae%97%e6%b3%95%e8%af%a6%e8%a7%a3\/","title":{"rendered":"DES\u7b97\u6cd5\u8be6\u89e3"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">DES\u7b97\u6cd5\u4f9d\u65e7\u8981\u6c42\u4f9d\u65e7\u662f\u7279\u5f81\u8bc6\u522b\uff0c\u52a0\u5bc6\u6d41\u7a0b\u8fd8\u662f\u5462\u4e00\u5957<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u9006\u5411\u89d2\u5ea6\u770b\uff0cDES \u6709\u51e0\u4e2a\u5f88\u9c9c\u660e\u7684\u6807\u5fd7\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 <strong>64 \u4f4d\u5206\u7ec4<\/strong>\u5206\u6210L0\u548cR0\u4e24\u7ec4<\/li>\n\n\n\n<li>\u5b9e\u9645\u6709\u6548\u5bc6\u94a5\u957f\u5ea6\u4e3a <strong>56 \u4f4d<\/strong><\/li>\n\n\n\n<li>\u6574\u4f53\u91c7\u7528 <strong>16 \u8f6e Feistel \u7ed3\u6784<\/strong><\/li>\n\n\n\n<li>\u8f6e\u51fd\u6570\u91cc\u901a\u5e38\u4f1a\u51fa\u73b0 <strong>\u6269\u5c55\u7f6e\u6362\u3001\u5f02\u6216\u3001S \u76d2\u67e5\u8868\u3001P \u7f6e\u6362<\/strong><\/li>\n\n\n\n<li>\u5b50\u5bc6\u94a5\u751f\u6210\u8fc7\u7a0b\u4f1a\u51fa\u73b0 <strong>PC-1\u3001\u5faa\u73af\u5de6\u79fb\u3001PC-2<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ea\u8981\u5728\u9898\u76ee\u4e2d\u770b\u5230\u8fd9\u4e9b\u7279\u5f81\uff0c\u57fa\u672c\u5c31\u53ef\u4ee5\u5f80 DES \u65b9\u5411\u6000\u7591\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DES \u7684\u6574\u4f53\u7ed3\u6784<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DES \u662f\u4e00\u79cd\u5178\u578b\u7684\u5206\u7ec4\u5bc6\u7801\u7b97\u6cd5\uff0c\u6bcf\u6b21\u5904\u7406 <strong>64 bit \u660e\u6587\u5757<\/strong>\u3002<br>\u5bc6\u94a5\u957f\u5ea6\u540d\u4e49\u4e0a\u662f 64 bit\uff0c\u4f46\u5176\u4e2d\u6709 8 bit \u7528\u4f5c\u5947\u5076\u6821\u9a8c\uff0c\u56e0\u6b64\u771f\u6b63\u53c2\u4e0e\u52a0\u5bc6\u8fd0\u7b97\u7684\u662f <strong>56 bit<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DES \u7684\u6838\u5fc3\u662f <strong>Feistel \u7f51\u7edc<\/strong>\u3002\u5b83\u7684\u57fa\u672c\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5bf9 64 bit \u660e\u6587\u505a\u4e00\u6b21 <strong>\u521d\u59cb\u7f6e\u6362 IP<\/strong><\/li>\n\n\n\n<li>\u5c06\u7ed3\u679c\u5206\u6210\u5de6\u53f3\u4e24\u90e8\u5206\uff1a<code>L0<\/code> \u548c <code>R0<\/code>\uff0c\u5404 32 bit<\/li>\n\n\n\n<li>\u8fdb\u884c 16 \u8f6e\u8fed\u4ee3\uff1a <math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><msub><mi>L<\/mi><mi>i<\/mi><\/msub><mo>=<\/mo><msub><mi>R<\/mi><mrow><mi>i<\/mi><mo>\u2212<\/mo><mn>1<\/mn><\/mrow><\/msub><\/mrow><annotation encoding=\"application\/x-tex\">L_i = R_{i-1}<\/annotation><\/semantics><\/math><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><msub><mi>R<\/mi><mi>i<\/mi><\/msub><mo>=<\/mo><msub><mi>L<\/mi><mrow><mi>i<\/mi><mo>\u2212<\/mo><mn>1<\/mn><\/mrow><\/msub><mo>\u2295<\/mo><mi>F<\/mi><mo stretchy=\"false\">(<\/mo><msub><mi>R<\/mi><mrow><mi>i<\/mi><mo>\u2212<\/mo><mn>1<\/mn><\/mrow><\/msub><mo separator=\"true\">,<\/mo><msub><mi>K<\/mi><mi>i<\/mi><\/msub><mo stretchy=\"false\">)<\/mo><\/mrow><annotation encoding=\"application\/x-tex\">R_i = L_{i-1} \\oplus F(R_{i-1}, K_i)<\/annotation><\/semantics><\/math><\/li>\n\n\n\n<li>16 \u8f6e\u7ed3\u675f\u540e\uff0c\u5c06\u5de6\u53f3\u4ea4\u6362<\/li>\n\n\n\n<li>\u518d\u7ecf\u8fc7\u4e00\u6b21 <strong>\u672b\u7f6e\u6362 FP<\/strong><\/li>\n\n\n\n<li>\u5f97\u5230\u6700\u7ec8\u5bc6\u6587<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u7ed3\u6784\u975e\u5e38\u5173\u952e\uff0c\u56e0\u4e3a\u5b83\u610f\u5473\u7740 <strong>\u52a0\u5bc6\u548c\u89e3\u5bc6\u6d41\u7a0b\u51e0\u4e4e\u76f8\u540c\uff0c\u53ea\u662f\u5b50\u5bc6\u94a5\u987a\u5e8f\u76f8\u53cd<\/strong>\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DES \u8f6e\u51fd\u6570 F \u7684\u7ec4\u6210<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DES \u7684\u96be\u70b9\u4e3b\u8981\u96c6\u4e2d\u5728\u8f6e\u51fd\u6570 <code>F<\/code> \u4e0a\u3002<br>\u8fd9\u4e2a\u51fd\u6570\u63a5\u6536\u4e24\u4e2a\u8f93\u5165\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53f3\u534a\u90e8\u5206 <code>R<\/code>\uff0c32 bit<\/li>\n\n\n\n<li>\u5f53\u524d\u8f6e\u5b50\u5bc6\u94a5 <code>K_i<\/code>\uff0c48 bit<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5904\u7406\u8fc7\u7a0b\u5206\u4e3a\u56db\u6b65\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. 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S \u76d2\u66ff\u6362<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06 48 bit \u5212\u5206\u6210 8 \u7ec4\uff0c\u6bcf\u7ec4 6 bit\u3002<br>\u6bcf\u7ec4\u5206\u522b\u8f93\u5165\u4e00\u4e2a S \u76d2\uff0c\u8f93\u51fa 4 bit\u3002<br>8 \u4e2a S \u76d2\u603b\u5171\u628a 48 bit \u538b\u7f29\u56de 32 bit\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">S \u76d2\u662f DES \u6700\u6838\u5fc3\u7684\u975e\u7ebf\u6027\u6765\u6e90\uff0c\u4e5f\u662f\u9006\u5411\u9898\u6700\u5bb9\u6613\u85cf\u8868\u7684\u5730\u65b9\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. P \u7f6e\u6362<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06 S \u76d2\u8f93\u51fa\u7684 32 bit \u518d\u6b21\u6253\u4e71\u987a\u5e8f\uff0c\u5f97\u5230\u8f6e\u51fd\u6570\u6700\u7ec8\u8f93\u51fa\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\u53ef\u4ee5\u628a\u8f6e\u51fd\u6570\u8bb0\u6210\uff1a<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><mi>F<\/mi><mo stretchy=\"false\">(<\/mo><mi>R<\/mi><mo separator=\"true\">,<\/mo><mi>K<\/mi><mo stretchy=\"false\">)<\/mo><mo>=<\/mo><mi>P<\/mi><mo stretchy=\"false\">(<\/mo><mi>S<\/mi><mo stretchy=\"false\">(<\/mo><mi>E<\/mi><mo stretchy=\"false\">(<\/mo><mi>R<\/mi><mo stretchy=\"false\">)<\/mo><mo>\u2295<\/mo><mi>K<\/mi><mo stretchy=\"false\">)<\/mo><mo stretchy=\"false\">)<\/mo><\/mrow><annotation encoding=\"application\/x-tex\">F(R, K) = P(S(E(R) \\oplus K))<\/annotation><\/semantics><\/math><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DES 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