Cryptanalysis of the OKH Authenticated Encryption Scheme

Peng Wang; Wenling Wu; Liting Zhang

Paper 2012/580

Cryptanalysis of the OKH Authenticated Encryption Scheme

Peng Wang, Wenling Wu, and Liting Zhang

Abstract

Alomair proposed a new authenticated encryption scheme OKH at ACNS 2012, and proved the security, i.e. authenticity and privacy, of OKH. Our research shows that it is not the case. We only need one query to break the authenticity of OKH with success probability of $1$, and two queries to break the privacy of OKH with success probability of $1-1/2^n$, where $n$ is the block-length of underlying blockcipher.

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Published elsewhere. Unknown where it was published
Keywords: Authenticated Encryption
Contact author(s): wp @ is ac cn
History: 2012-11-29: revised; 2012-10-16: received; See all versions
Short URL: https://ia.cr/2012/580
License: CC BY

BibTeX

@misc{cryptoeprint:2012/580,
      author = {Peng Wang and Wenling Wu and Liting Zhang},
      title = {Cryptanalysis of the {OKH} Authenticated Encryption Scheme},
      howpublished = {Cryptology {ePrint} Archive, Paper 2012/580},
      year = {2012},
      url = {https://eprint.iacr.org/2012/580}
}