提供了大量源码，DES算法为密码体制中的对称密码体制，又被成为美国数据加密标准DES加密算法特点：分组比较短、密钥太短、密码生命周期短、运算速度较慢-Provides a wealth of source, DES algorithm in symmetric key cryptography system, then known as the United States data encryption standard DES encryption algorithm features: sh