Password-based Authenticated Key Agreement Protocol Secure Against Advanced Modification Attack

Password-based mechanism is widely used methods for user authentication. Password-based mechanisms are using memorable passwords(weak ferrets), therefore Password-based mechanism are vulnerable to the password guessing attack. To overcome this problem, man password-based authenticated key exchange protocols have been proposed to resist password guessing attacks. Recently, Seo-Sweeny proposed password-based Simple Authenticated Key Agreement(SAKA) protocol. In this paper, first, we will examine the SAKA and authenticated key agreement protocols, and then we will show that the proposed simple authenticated key agreement protocols are still insecure against Advanced Modification Attack. And we propose a password-based Simple Authenticated Key Agreement Protocol secure against Advanced Modification Attack.