A Group PAKE Protocol Using Different Passwords

Although two-party password-authenticated key exchange protocols have been intensively studied in recent years, group password-authenticated key exchange protocols have received little attention. In this paper, we propose a group password-authenticated key exchange protocol with key confirmation for the independent-password setting, where each party shares an independent password with a trusted server. This proposed protocol is based on 2^d-cube group key exchange protocol. In this paper, we also present a formal statement of its security in a variant of the Bresson et al. security model.