LFSR and stream password \ generate nonlinear sequences \ DES algorithm for encryption and decryption operations, in front of a few relatively simple, DES algorithm results also

一系列的加密算法，包括恺撒密码、KeyWord密码、PlayFair密码、Vigenere密码、LFSR密码、RC4密码、DES密码和IDEA密码。-A series of encryption algorithms, including Caesar password, keyword password, the Playfair password, the Vigenere Password, the LFSR password, RC4 password DES password and

1)利用C\C++语言实现给定的LFSR； 2）通过不同初始状态生成相应的序列，并观察它们的周期有什么特点； 3）利用生成的序列对文本进行加/解密 -1) using the C \ C++ language given LFSR 2) to generate the corresponding sequences different initial state, and observe what are the characteristics of their period 3