第一部分 数据加密标准DES （1）掌握DES中各加密函数对其性能影响； （2）DES的特性分析，包括互补性和弱密钥； （3）DES的实际应用，包括各种数据类型的加/脱密、DES的短块处理。 -The first part of the Data Encryption Standard DES (1) grasp the DES encryption function of each effect on its performance (2) DES characteristi

It is encryption and decryption algorithm. AES is a symmetric encryption algorithm processing data in block of 128 bits.Under the influence of a key, a 128-bit block is encrypted by transforming it in a unique way into a new block of the same s

MD5算法：MD5以512位分组来处理输入的信息，且每一分组又被划分为16个32位子分组，经过了一系列的处理后，算法的输出由四个32位分组组成，将这四个32位分组级联后将生成一个128位散列值-The MD5 algorithm: MD5 with 512 bit block to process input information, and each group was divided into 16 groups of 32 seats, after a series of processi

SPN加密解密，有短块处理，采用相同的S盒，能完成基本的加密解密功能，大致就是这样的啦-SPN encryption and decryption, with short block processing, using the same S-box, to complete the basic encryption and decryption functions, so it generally is