1996年， E.Schaefer 提出了一个简化的DES加密算法， 即S-DES加密算法。S-DES是一个对称分组加密的简化模型，目的不在于应用，它非常具体地说明了分组密码中如何实施扩散和扰乱， 揭示了设计分组密码算法的基本模式和框架，在密码学习中有着重要的意义。编写一个软件能够实现S-DES分组加解密-In 1996, E. Schaefer proposed a simplified DES encryption algorithm, namely, S-DES encryption algorithm. S-DES is a symmetric block cipher of the simplified model, not to application, it is very specifically to understand how to implement block ciphers in the proliferation and disrupted, revealing the design of the basic mode of block cipher algorithms and fr a mework for learning in the password has an important significance. Write a software to achieve S-DES encryption and decryption Packet