From Related-Key Distinguishers to Related-Key-Recovery on Even-Mansour Constructions

Pierre Karpman

Paper 2015/134

From Related-Key Distinguishers to Related-Key-Recovery on Even-Mansour Constructions

Pierre Karpman

Abstract

We show that a distinguishing attack in the related key model on an Even-Mansour block cipher can readily be converted into an extremely efficient key recovery attack. Concerned ciphers include in particular all iterated Even-Mansour schemes with independent keys. We apply this observation to the Caesar candidate Prøst-OTR and are able to recover the whole key with a number of requests linear in its size. This improves on recent forgery attacks in a similar setting.

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Published elsewhere. ISC 2015
DOI: 10.1007/978-3-319-23318-5_10
Keywords: Even-Mansour related-key attacks Prøst-OTR
Contact author(s): pierre karpman @ gmail com
History: 2016-01-29: last of 2 revisions; 2015-02-26: received; See all versions
Short URL: https://ia.cr/2015/134
License: CC BY

BibTeX

@misc{cryptoeprint:2015/134,
      author = {Pierre Karpman},
      title = {From Related-Key Distinguishers to Related-Key-Recovery on Even-Mansour Constructions},
      howpublished = {Cryptology {ePrint} Archive, Paper 2015/134},
      year = {2015},
      doi = {10.1007/978-3-319-23318-5_10},
      url = {https://eprint.iacr.org/2015/134}
}