压缩包中有古典密码学中放射密码和维吉尼亚密码以及 DES加密解密，并观察DES密码体制的性质。-compressed with classical cryptography radiotherapy passwords and Virginia passwords and DES encryption and decryption. DES and observation system in nature.

RSA算法是密码学中一个重要算法，该程序给出了该算法的完整实现过程。 -RSA cryptography algorithm is an important algorithm, the procedure of the algorithm is a complete implementation process.

Linux FreeS/WAN is an implementation of IPSEC & IKE for Linux. IPSEC is Internet Protocol SECurity. It uses strong cryptography to provide both authentication and encryption services. Authentication ensures that packets are from the right sender a