ACAC Seminar Abstract

ACAC Seminar Abstract

ACAC Seminars

ACAC Seminar Abstract

Enhanced Security Notions for Dedicated-Key Hash Functions: Definitions and Relationships

Speaker: Mohammad Reza Reyhanitabar
Date, Time: Fri, 09 Apr 2010 15:00

We revisit security notions for dedicated-key hash functions, considering two essential theoretical aspects; namely, formal definitions for security notions, and the relationships among them. Our contribution is twofold. First, we provide a new set of enhanced security notions for dedicated-key hash functions. The provision of this set of enhanced properties has been motivated by the introduction of the enhanced target collision resistance (eTCR) property by Halevi and Krawczyk at Crypto 2006. As the second and main part of our contribution, we provide a full picture of relationships (i.e. implications and separations) among the security notions. The implications and separations are supported by formal proofs (reductions) and/or counterexamples in the concrete-security framework.

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