Paper 2014/017

Two-round password-only authenticated key exchange in the three-party setting

Junghyun Nam, Kim-Kwang Raymond Choo, Juryon Paik, and Dongho Won


We present the first provably-secure 3-party password-only authenticated key exchange (PAKE) protocol that can run in only two communication rounds. Our protocol is generic in the sense that it can be constructed from any 2-party PAKE protocol. The protocol is proven secure in a variant of the widely accepted model of Bellare, Pointcheval and Rogaway (2000) without any idealized assumptions on the cryptographic primitives used. We also investigate the security of the 2-round 3-party PAKE protocol of Wang, Hu and Li (2010), and demonstrate that this protocol cannot achieve implicit key authentication in the presence of an active adversary.

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-- withdrawn --
Cryptographic protocols
Publication info
Preprint. MINOR revision.
three-party key exchangecommunication rounddictionary attackimplicit key authentication
Contact author(s)
jhnam @ kku ac kr
2014-08-18: withdrawn
2014-01-07: received
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