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In this paper, we present a new group signature scheme based on RSA assumption. It not only achieves the same objective as the Lee-Chang scheme but also reduces the amount of computing time as compared to the Lee-Chang scheme and the Lee-Chang-Hwang scheme.

Abstract:In this paper, we propose new password authenticated key exchange (PAKE) and protected password change (PPC) protocols without any symmetric or public-key cryptosystems. The security of the proposed protocols is based on the computational Diffie-Hellman assumption in the random oracle model. The proposed scheme can resist both forgery server and denial of service attacks.

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