Protocols for group key exchange are cryptographic algorithms that describe how a group of parties communicating over a public network can come up with a common secret key. Due to their critical role in building secure multicast channels, a number of group key exchange protocols have been proposed over the years for a variety of settings. In this work, we present a new protocol for password-authenticated group key exchange in the model where the clients wishing to establish a common secret do not share any password between them but hold their individual password shared with a trusted server. This model is practical in that no matter how many different session keys for different groups a client wants to generate, he/she does not need to hold multiple passwords but only needs to remember a single password shared with the server. Our construction is generic. We assume a 3-party password-authenticated key exchange protocol and use it as a key component in building our password-authenticated GKE protocol. Our generic protocol requires no further long-term secrets than those used in the underlying 3-party protocol. This implies that if the given 3-party protocol is password-only authenticated, then our group key exchange protocol is password-only authenticated as well. © 2011 Springer-Verlag.
CITATION STYLE
Nam, J., Paik, J., Kim, J., Lee, Y., & Won, D. (2011). Server-aided password-authenticated key exchange: From 3-party to group. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 6771 LNCS, pp. 339–348). https://doi.org/10.1007/978-3-642-21793-7_38
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