为了保证广域网系统的安全 ,在说明其安全威胁和安全要求的基础上 ,介绍了 PGP的原理、技术特点及配置方法 ,通过对 PGP安全性的分析得出结论 :基于 PGP本质上的安全性 ,只要遵循正确的使用方法 ,就可以很好地避免安全漏洞的产生 ,从而达到确保广域网系统安全的目的 In order to ensure the security of WAN system, based on the description of its security threats and security requirements, the principle, technical features and configuration methods of PGP are introduced. Based on the analysis of PGP security, it is concluded that based on the inherent security of PGP, Just follow the correct use of methods, we can well avoid the emergence of security vulnerabilities, so as to achieve the purpose of ensuring the safety of WAN systems