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.

一款加壳软件的源代码，对于学习软件安全和设计压缩加密程序很有帮助,加壳a software source code, for the study and design of software security encryption useful compression