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Because of the growing importance in the fields of computer networks, how to keep user's privacy has drawn more and more concerns in recent years. In this paper, the authors first point out that the two given anonymous password-based authenticated and key exchange protocols are vulnerable to the anonymity attack. Then based on a ring signature scheme, they propose a new secure anonymous authenticated and key exchange protocol, which inherits all the good virtues of the previous protocols. Furthermore, they discuss the security attributes of their new scheme. Finally, they give an extension of their new scheme's application and make a conclusion of this paper.
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