加密（Encryption）是信息保护的一种必不可少的手段。目前有两种基本的加密方法，即私钥加密和公钥加密。用VB既可用自定义算法实现简便的私钥加密，也可通过调用Crypto API接口实现复杂的公钥加密。对于加密数据，若在Internet/Intranet上传送，则完整性鉴别也是必需的。本文介绍一种私钥加密技术，不仅能加密英文文本，而且能有效加密汉字，还能进行数据完整性鉴别。-Encryption (Encryption) is an essential information protection means. There are two basic types of encryption methods, namely the private key encryption and public key encryption. VB can use a custom simple and private key encryption algorithm can also be achieved by calling the Crypto API interface to a complex public key encryption. For encrypted data, if the Internet/Intranet to transmit, then the integrity of the identification is also required. This paper describes a private key encryption technology can not only encrypt the English text, and can encrypt character, but also for data integrity authentication.