Ciphertext Forgery on HANUMAN

Damian Vizár

Paper 2016/697 Original: eprint.iacr.org/2016/697 ↗

Ciphertext Forgery on HANUMAN

Damian Vizár

Abstract

HANUMAN is a mode of operation of a keyless cryptographic permutation for nonce-based authenticated encryption with associated data, included among the modes bundled in the PRIMATEs candidate in the currently ongoing CAESAR competition. HANUMAN is a sponge-like mode whose design and security argument are inspired by the SpongeWrap construction. We identify a flaw in the domain separation of HANUMAN, and show how to exploit it to efficiently produce ciphertext forgeries.

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Preprint.
History: 2016-07-13: last updated; 2016-07-13: published
Short URL: https://ia.cr/2016/697
License: https://creativecommons.org/licenses/by/4.0/

BibTeX

@misc{cryptoeprint:2016/697,
      author = {Damian Vizár},
      title = {Ciphertext Forgery on HANUMAN},
      howpublished = {Cryptology {ePrint} Archive, Paper 2016/697},
      year = {2016},
      url = {https://eprint.iacr.org/2016/697}
}