On the Security of ``an efficient and complete remote user authentication scheme''

Details On the Security of ``an efficient and complete remote user authentication scheme'' On the Security of ``an efficient and complete remote user authentication scheme''

2008-02-14

arxiv.org/abs/0802.2112v1

Computer Science

Cryptography and Security

Scientific paper

Recently, Liaw et al. proposed a remote user authentication scheme using smart cards. Their scheme has claimed a number of features e.g. mutual authentication, no clock synchronization, no verifier table, flexible user password change, etc. We show that Liaw et al.'s scheme is completely insecure. By intercepting a valid login message in Liaw et al.'s scheme, any unregistered user or adversary can easily login to the remote system and establish a session key.

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