📄 bbs水木清华站∶精华区readme.htm
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<H1>BBS水木清华站∶精华区</H1></CENTER>发信人: yuhj (勇~小螃蟹长大了), 信区: Hacker <BR>标 题: DES算法简单说明 (转载) <BR>发信站: BBS 水木清华站 (Mon Jun 9 07:05:36 1997) <BR> <BR>【 以下文字转载自 Security 讨论区 】 <BR>【 原文由 chenlh 所发表 】 <BR>下面是一个des算法的简要说明,不过是英文的....... <BR> <BR> <BR> How to implement the <BR> Data Encryption Standard (DES) <BR> <BR> A step by step tutorial <BR> Version 1.2 <BR> <BR> <BR>The Data Encryption Standard (DES) algorithm, adopted by the U.S. <BR>government in 1977, is a block cipher that transforms 64-bit data blocks <BR>under a 56-bit secret key, by means of permutation and substitution. It <BR>is officially described in FIPS PUB 46. The DES algorithm is used for <BR>many applications within the government and in the private sector. <BR> <BR>This is a tutorial designed to be clear and compact, and to provide a <BR>newcomer to the DES with all the necessary information to implement it <BR>himself, without having to track down printed works or wade through C <BR>source code. I welcome any comments. <BR> Matthew Fischer <<A
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