Password Authenticated Key Exchange and Protected Password Change Protocols

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.

Keywords

• authenticated key exchange
• Diffie-Hellman problem
• password authentication
• provable security