MD5

一个加密的算法。-An encryption algorithm.

本代码实现了playfair加密方法的变种，手动输入一个密钥和一串需要加密的字符串，解密的时候，则输入密钥和已加密的字符串，即加密解密是一个程序。详细请看代码。(This code implements a variant of the playfair encryption method to manually enter a key and a string of encrypted string decryption, enter the key and the encrypted string, that is, encryption decryption is a program. Look at the code in detail.)

C network programming this source is vectorcross

对于ECC 进行加密解密运算，这里主要是ECDSA的签名(For ECC encryption and decryption operations, where mainly ECDSA signature)

说明：  利用HASH（采用sha-1算法）算法原理，设计数字签名的水印算法，完成嵌入、（提取）验证，(Use HASH (using sha-1 algorithm) algorithm, design of watermarking algorithms digital signature to complete the embedding, (extract) authentication,)

LZ77 compression / decompression algorithm-LZ77 compression/decompression algorithm

图像加密与密写技术，很强悍的！现在很需要这种东西的哦(密写哦！！！！！！)

采用Arnold变换对彩色图像进行加密操作，并能实现解密，恢复原图像(Adopt Arnold transform pairs of color image carry on encryption operation, and can realize decryption, restore the the original image)

另类密码登录窗体（拼图），只有正确拼出结果图才能进入。-alternative Password Login Window (puzzles), the only correct map decorated results can be admitted.

经典的做哈希值的加密算法源码，使用c++语言写的。(To do the classic hash code encryption algorithm, using c++ language.)