The concept and advantage of VPN technology are introduced in the article.Four security technologies are analyzed for realizing VPN: tunneling, encryption &decryption, key management, authentication.

• 本文介绍了VPN技术的概念和优点，分析了政务网中实现VPN的四项安全技术：隧道技术、加解密技术、密钥管理技术和身份认证技术。