来自putty的大数运算代码，纯C实现，移植性好，RSA的最实现

DES加密算法实现的C++类-DES encryption algorithm realization C kind

是DES的编码密码算法，非常适合初学者学习，欢迎使用。-DES cryptographic algorithm is the encoding is very suitable for beginners to learn, welcome to use.

实现维吉尼亚密码，用键盘接收明文和密钥，屏幕打印密文。-The achievement of Virginia password, use the keyboard to receive explicit and key, screen printing ciphertext.

AES加密软件，用于加密当前文本框中的内容。使用的是美国国家标准（也被ISO所采纳）最新加密算法AES。-AES encryption software, encryption for the current contents of the text box. The use of the American National Standards (also adopted by the ISO) the latest encryption algorithm AES.

VPN拨号程序源码(from sourceforge.net)-VPN digit dialing procedure source code (from sourceforge.net)

软件有限次加密，对软件的使用次数进行限制-finite encryption software, software usage restrictions

密码学的数字签名算法 来自国外教材-Cryptography Digital Signature Algorithm materials from abroad

创建一个经过加密的软件系统信息文件，在软件启动时会校验这些信息，判断是授权用户在使用该软件。-create an encrypted document information system software, the software will start checking the information, and judgment is authorized users in the use of the software.

RSA的加密算法的应用DEMO 也是用来加密的。-RSA encryption algorithm application DEMO also is uses for to encrypt.

MD5源代码，可制成exe文件或者dll文件。-MD5 source code, can be made exe file or dll file.