Abstract
Although many password-authenticated group key exchange protocols have been proposed in recent years, it remains a non-trivial task to establish strong provable security guarantees without making idealized assumptions. In this paper, blending the best of a variant EKE scheme and Burmester-Desmedt (BD) group key exchange protocol, we present a provable secure and efficient different password-authenticated group key exchange (DPWA) protocol of three-round in the multicast setting. Based on the previous works, we first give a strengthened security model for this case, and then provide a security proof of our protocol in this model under the standard assumption.
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