A novel wireless authentication protocol preserving user anonymity and untraceability

In this paper, we present a novel wireless authentication protocol with providing mobile users anonymity and untraceability. Our scheme is based on smart card and public key cryptosystems, and mobile users only do hash operation and symmetric decryption. In our protocol, mobile users change their passwords freely and securely without the help of the corresponding home network or the visited network, while also providing secure mutual authentication. The most significant feature is that provides perfect confidentiality to mobile user's identity and the session keys even though the secret parameters in smart card have been leaked completely. Finally, the performance of our scheme is analyzed.