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Due to the increasing interest and demands of user privacy, remote user authentication schemes using smart card has been researched in active. Recently, a lot of suggestion have been made in order to provide user`s anonymity and trace a malicious user. In 2008, Kim et al. proposed a traceable anonymity authentication scheme. In 2009, Choi et al. pointed out that Kim`s protocol was insecure against outsider attacker and proposed an improved scheme. But Kim`s and Choi`s schemes fail to provide the user`s anonymity or compute some values in the protocol. In this paper, we analyse those problems and suggest two improved schemes to resolve those problems.

An Efficient User Authentication Protocol using Smartcard