以授權(quán)管理基礎(chǔ)設(shè)施和公鑰基礎(chǔ)設(shè)施為基礎(chǔ)，研究了單點訪問系統(tǒng)的實現(xiàn)模型。這兩種技術(shù)在單點訪問系統(tǒng)中實現(xiàn)身份認(rèn)證和訪問授權(quán)控制功能。通過中間件的方式來實現(xiàn)身份認(rèn)證和授權(quán)管理模型，并設(shè)計了相關(guān)的安全協(xié)議，對整個體系結(jié)構(gòu)的安全做了簡單分析。該技術(shù)可使現(xiàn)有應(yīng)用做較少的修改就能實現(xiàn)一個安全、透明的單點訪問系統(tǒng)。

SAS(Single Access System) is studied based on the PKI (Public Key Infrastructure) model and PMI (Privilege Management Infrastructure) model. The PKI and PMI can provide functions of authentication and authority in the SAS. The way to implement the authority and authentication using middleware as well as related secure protocol is discussed. The security of the system’s architecture is also analyzed. These models enable a secure, transparent SAS with least modification to current applications.