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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
-
CC BY
