Cryptology ePrint Archive: Report 2015/175

Trivial Nonce-Misusing Attack on Pure OMD

Tomer Ashur and Bart Mennink

Abstract: Pure OMD is an authenticated encryption mode that will be presented by Reyhanitabar et al. at FSE 2015. It is (among others) claimed to achieve authenticity against nonce-misusing adversaries. We show that this claim is incorrect, by presenting an adversary that makes 3 queries (including the forgery) of a total complexity 6.

Category / Keywords: secret-key cryptography / authenticated encryption, pOMD

Date: received 27 Feb 2015

Contact author: bart mennink at esat kuleuven be

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Version: 20150228:071454 (All versions of this report)

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