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Future mobile devices are expected to access different networks (such as 3rd generation network, WLAN, Bluetooth, Internet, and etc). Hence many sensitivity data are stored in them. How to protect the security of information and applications about mobile devices becomes an exigent problem. This paper proposes a secure authentication and authorization protocol for mobile devices. The protocol employs biometric identification and password mechanism. Different users could access different information and applications, which are associated with different security levels. Users, mobile equipments and universal subscriber identity module (USIM) could mutual authenticate. Messages are encrypted when they are exchanged.