IACR News item: 11 June 2014
Ran Canetti, Daniel Shahaf, Margarita Vald
ePrint ReportWe give a modular and composable analytical framework for PKI-based message authentication protocols. This framework guarantees security even when the PKI is pre-existing and globally available, without being unnecessarily restrictive. Specifically, we model PKI as a global set-up functionality within the \\emph{Global~UC} security model [Canetti \\etal, TCC 2007] and relax the ideal authentication functionality accordingly. We then demonstrate the security of a simple signature-based authentication protocol. Our modeling makes minimal security assumptions on the PKI in use; in particular, ``knowledge of the secret key\'\' is not guaranteed or verified. To enable our treatment, we formulate two new composition theorems.
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