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Title:
TMAC: Two-Key CBC MAC
Authors: Kaoru Kurosawa, 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.
ePrint: https://eprint.iacr.org/2002/092
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