SSL VPN technologies in being lack the central management mechanism. The authentication and authorization functions are simplex, which can't meet the needs of complex network applications.
现有的SSL VPN技术缺少集中的安全管理机制，认证与访问控制功能也比较单一，无法满足这种复杂的网络应用。
SPKI is a sort of distributed authorization mechanism, which combines authorization certificate and name certificate to realize identity validation and authorization management.
SPKI是一种分布式的授权机制，采用授权证书和名字证书结合的方式来实现身份认证和权限控制。
Trust management is a better and more efficiency authorization mechanism which deals with the credentials, security policies and trust relationships integrated, and do authorization directly.
信任管理体系是一种能综合处理信任状、信任关系和安全策略，直接实现授权，且更高效、更完善的分布式授权方式。
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