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This paper shows that a scheme provided by An[7] is not enough to satisfy security requirements for a user certification using a password-based smart card. In order to compensate this weakness, this study provides an improved user scheme with a hash function and ElGamal signature. This new scheme has some advantages protecting password guessing attack, masquerade, and replay attack as well as providing forward secrecy. Compared to An’s certification scheme, this scheme suggests that the effect of computational complexity is similar but the efficiency of safety is better. Key Words : User Authentication, Smart Cards, Password Guessing Attack, Impersonation Attack *  : (shinss@tu.ac.kr) 11 09 05  (1 11 09 26, 2 11 10 05, 3 11 10 07)  11 12 13 1.                    .                 .                 ,           . 1981 Lamport[1]            , 1993 Chang-Wu[2]       .               .Lamport               . 2002 Hwang-Li[3]        .        [4].[5]. Wang-Li[6] Hwang-Li     ElGamal           . An[7] Wang-Li

Secure Remote User Authentication Scheme for Password Guessing Attack