Cryptographic Service Provider （简称CSP）是Microsoft 公司用来在Windows平台上提供第三方加密模块的接口标准。一个SP 模块包含了一些标准加密算法的实现，是API 函数的具体执行者，同时CSP 模块也提供了密钥的安全存储和使用机制。-Cryptographic Service Provider (referred CSP) is the Microsoft Windows platform, the company used to provide third-party cryptographic module interface standard. An SP module contains a number of standard encryption algorithm, is the actual implementation of those API functions, while CSP module also provides a key mechanism for the secure storage and use.