本文叙述了X509-V3证书的具体结构，以及用C++语言编程实现CA服务器与客户机的具体方法。详细描述了证书的定义和组成，并简要介绍了用来定义证书的ASN.1抽象句法描述语言。-This paper describes the specific structure of the X509-V3 certificates, and the CA server and client with C++ language programming. A detailed descr iption of the definition and composition of the certificate, and briefly describes the ASN.1 abstract syntax descr iption language used to define the certificate.