Cryptology ePrint Archive: Report 2013/621

Multi-LHL protocol

Marika Mitrengová

Abstract: We present a password-authenticated group key exchange protocol where each user has his/her own password. Advantage of such protocol is in short passwords, which can be easily memorized. On the other hand these protocols face the low password entropy. In the first part we define security model based on models of Abdalla, Fouque and Pointcheval and Bellare, Pointcheval, Rogaway. We construct MLHL (Multi-LHL) protocol, which is based on LHL protocol proposed by Lee, Hwang and Lee. However, LHL protocol is flawed as pointed by Abdalla, Bresson, Chevassut and Choo, Raymond. We prove that our protocol is secure authenticated key exchange protocol with forward secrecy property and that the protocol is resistant against attacks on LHL protocol.

Category / Keywords: cryptographic protocols / protocol, password, security

Date: received 26 Sep 2013

Contact author: mitrengova at dcs fmph uniba sk

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Version: 20130927:124737 (All versions of this report)

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