[Resource Topic] 2015/175: Trivial Nonce-Misusing Attack on Pure OMD

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Trivial Nonce-Misusing Attack on Pure OMD

Authors: Tomer Ashur, Bart Mennink


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.

ePrint: https://eprint.iacr.org/2015/175

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