Please use this identifier to cite or link to this item: http://repositorio.inesctec.pt/handle/123456789/11777
Title: Universally Composable Relaxed Password Authenticated Key Exchange
Authors: Manuel Barbosa
Xu,JY
Katz,J
Jarecki,S
Bradley,T
Abdalla,M
Issue Date: 2020
Abstract: Protocols for password authenticated key exchange (PAKE) allow two parties who share only a weak password to agree on a cryptographic key. We revisit the notion of PAKE in the universal composability (UC) framework, and propose a relaxation of the PAKE functionality of Canetti et al. that we call lazy-extraction PAKE (lePAKE). Our relaxation allows the ideal-world adversary to postpone its password guess until after a session is complete. We argue that this relaxed notion still provides meaningful security in the password-only setting. As our main result, we show that several PAKE protocols that were previously only proven secure with respect to a “game-based” definition of security can be shown to UC-realize the lePAKE functionality in the random-oracle model. These include SPEKE, SPAKE2, and TBPEKE, the most efficient PAKE schemes currently known. © International Association for Cryptologic Research 2020.
URI: http://repositorio.inesctec.pt/handle/123456789/11777
http://dx.doi.org/10.1007/978-3-030-56784-2_10
metadata.dc.type: Publication
conferenceObject
Appears in Collections:HASLab - Articles in International Conferences

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