Welcome to the resource topic for 2022/382
Title:
Witness-Authenticated Key Exchange Revisited: Improved Models, Simpler Constructions, Extensions to Groups
Authors: Matteo Campanelli, Rosario Gennaro, Kelsey Melissaris, Luca Nizzardo
Abstract:We revisit the notion of Witness Authenticated Key Exchange (\mathsf{WAKE}) where a party can be authenticated through a generic witness to an \mathsf{NP} statement. We point out shortcomings of previous definitions, protocols and security proofs in Ngo et al. (Financial Cryptography 2021) for the (unilaterally-authenticated) two-party case. In order to overcome these limitations we introduce new models and protocols, including the first definition in literature of group witness-authenticated key exchange. We provide simple constructions based on (succinct) signatures of knowledge. Finally, we discuss their concrete performance for several practical applications in highly decentralized networks.
ePrint: https://eprint.iacr.org/2022/382
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