Abdalla, MichelBohli, Jens MatthiasGonzález Vasco, María IsabelSteinwandt, Rainer2023-06-022023-06-022007Abdalla, M., Bohli, J., González Vasco, M. I., & Steinwandt, R. (21-24 February 2007). (Password) Authenticated Key Establishment: From 2-Party to Group [proceedings]. In Theory of Cryptography: 4th Theory of Cryptography Conference, TCC 2007, Amsterdam, The Netherlands. Part of the Lecture Notes in Computer Science book series (LNSC,volume 4392).978-3-540-70935-0https://hdl.handle.net/10016/37416Proceedings of: TCC 2007: Fourth IACR Theory of Cryptography Conference, 21-24 February 2007, Amsterdam, The Netherlands.A protocol compiler is described, that transforms any provably secure authenticated 2-party key establishment into a provably secure authenticated group key establishment with 2 more rounds of communication. The compiler introduces neither idealizing assumptions nor high-entropy secrets, e.g., for signing. In particular, applying the compiler to a password-authenticated 2-party key establishment without random oracle assumption, yields a password-authenticated group key establishment without random oracle assumption. Our main technical tools are non-interactive and non-malleable commitment schemes that can be implemented in the common reference string (CRS) model.16eng© 2007 Springer Berlin HeidelbergCommon reference string modelKey establishmentPassword-based authenticationProtocol compilerconference proceedingsInformáticaMatemáticashttps://doi.org/10.1007/978-3-540-70936-7_27open access499514Theory of Cryptography: 4th Theory of Cryptography Conference, TCC 2007, Amsterdam, The Netherlands, February 21-24, 2007. Proceedings4392CC/0000034121