Abstract:  The talk discusses a protocol compiler enabling the derivation of a group key establishment protocol from a given 2-party solution. The compiler can be applied in the context of password-based authentication and does not introduce idealizing assumptions. For a scenario where an existentially unforgeable signature scheme is available, the talk addresses the question of how such a compiler could help in building a group key establishment protocol on a group-theoretic assumption.

Based on joint work with Michel Abdalla, Jens-Matthias Bohli and María Isabel González Vasco.


Sponsored by the Algebraic Cryptography Center, the Laboratory for Secure Systems, and the PORTIA project.