An analysis on the advantages of both agent-based model and broker-based model in the web service about the present single sign-on model was proposed in this paper.Hence,an improvement on the SAML(security assertion markup language)in three-leveled management model was suggested in the process of register and confirmation to achieve the safety and convenience of Internet.%对现有的主要单点登录模型进行分析,结合基于代理模型和基于经纪人模型,提出了一种基于SAML安全断言的三层管理模型。对登录过程、认证过程进行了改进,提高了单点登录系统的安全性与便捷性。
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