Paper 2002/092

TMAC: Two-Key CBC MAC

Kaoru Kurosawa and Tetsu Iwata

Abstract

In this paper, we propose TMAC, Two-Key CBC Message Authentication Code. TMAC is a refinement of XCBC (which is a variant of CBC MAC) shown by Black and Rogaway. We use only $(k+n)$-bit key for TMAC while XCBC uses $(k+2n)$-bit key, where $k$ is the key length of the underlying block cipher and $n$ is its block length. The cost for reducing the size of secret keys is almost negligible; only one shift and one conditional XOR. Similarly to XCBC, our algorithm correctly and efficiently handles messages of arbitrary bit length.

Metadata
Available format(s)
PDF PS
Category
Secret-key cryptography
Publication info
Published elsewhere. NIST submission
Keywords
AESsecret-key cryptographymessage authentication codes
Contact author(s)
iwata @ cis ibaraki ac jp
History
2002-07-11: revised
2002-07-10: received
See all versions
Short URL
https://ia.cr/2002/092
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2002/092,
      author = {Kaoru Kurosawa and Tetsu Iwata},
      title = {TMAC: Two-Key CBC MAC},
      howpublished = {Cryptology ePrint Archive, Paper 2002/092},
      year = {2002},
      note = {\url{https://eprint.iacr.org/2002/092}},
      url = {https://eprint.iacr.org/2002/092}
}
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