Single Access System Based on Certificate

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.