this visual basic source code,perhaps usefull 4 you

RSA公钥加密，用C实现，大家可以参考一下-RSA public key encryption, using C to achieve, we can refer to

Base64编解码程序-Base64 code/decode program

实现本机加密-The realization of the local encryption

这是一个使用MD5算法对字符串进行加密的小程序-MD5 algorithm used to encrypt string of small programs

Microsoft CryptoAPI中公私密钥对的使用、HASH算法、数字签名等技术-Microsoft CryptoAPI in the use of public-private key pair, HASH algorithm, digital signature technology

JAVA密码保护页面,可以保护你不让想看的人，设置简单-JAVA password-protected pages, and can protect you from those who want to set up a simple

这本书包括了密码学和水印学竞争在内的各方面技术，这本书的内容覆盖知识范围广博，书中还有经过整理的代码，源代码等。-This book includes the study of cryptography and watermarking competition, including all aspects of technology, the content of this book cover a broad range of knowledge, the book also after finishing the code, source code and so on.

Compare Two Files HMACSHA1 VB 2005

数字证书处理程序-procedures for handling digital certificates

大名鼎鼎的DES加密算法，内有html文档做出详细解释-famous DES encryption algorithm, which is html files provide a detailed explanation