关键词: 安全服务 保护质量 安全模型 协商协议

Abstract:

In a system based on distributed services, the upper-level application system requests the lower-level security services to provide various security functions according to the former＇ s demands, to adjust the service relationship with different service providers on different requests automatically al long with the change of the current requests and states, to protect the security at the same time. A negotiation protocol model based on the quality of  protection which is used between applications and security services is presented here,and its goal is to ensure the security services＇ support and abid dance on the security standard required bv the applications, which will ensure the general security of the whole system.

Key words: security service, quality of protection, security model;negotiation protocol