(Password) Authenticated Key Establishment: From 2-Party To Group

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Provided by: Universidad Regiomontana
Topic: Security
Format: PDF
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. The authors' main technical tools are non-interactive and non-malleable commitment schemes that can be implemented in the Common Reference String (CRS) model.
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