这个是我同学做的DES加密解密文件包，还蛮好用的-This is my classmates do DES encryption and decryption package, quite useful

Java 实现DES文件加密、MD5获取数字签名和文件验证、RSA签名加密。分为接收端和发送端。-Java implementation of the DES file encryption, MD5 obtaining digital signatures and document verification, RSA signature encryption. Into the receiver and transmitter.