JAVA写的可以用RSA加密解密的代码，随机产生密钥，数据格式是长整型，代码包含求逆元、大数取模模块。-Can be written in JAVA RSA encryption and decryption code, randomly generated key, the data format is a long integer, the code contains the inverse element, large numbers modulo module.

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

AES对字符串的加密和解密，来满足对字符串的安全的需要。-AES encryption and decryption of string, to meet the needs of the security string.