Trivial Nonce-Misusing Attack on Pure OMD

Tomer Ashur; Bart Mennink

Paper 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.

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Preprint. MINOR revision.
Keywords: authenticated encryption pOMD
Contact author(s): bart mennink @ esat kuleuven be
History: 2015-02-28: received
Short URL: https://ia.cr/2015/175
License: CC BY

BibTeX

@misc{cryptoeprint:2015/175,
      author = {Tomer Ashur and Bart Mennink},
      title = {Trivial Nonce-Misusing Attack on Pure {OMD}},
      howpublished = {Cryptology {ePrint} Archive, Paper 2015/175},
      year = {2015},
      url = {https://eprint.iacr.org/2015/175}
}