The ZRTP Protocol - Analysis on the Diffie-Hellman mode

Abstract

ZRTP is a key agreement protocol by Philip Zimmermann, Alan Johnston and Jon Callas, which relies on a Di e-Hellman exchange to generate SRTP session parameters, providing con dentiality and protecting against Man-in-the-Middle attacks even without a public key infrastructure or endpoint certi cates. This is an analysis of the protocol performed with ProVerif, which tests security properties of ZRTP; in order to perform the analysis, the protocol has been modeled in the applied pi -calculus.