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TMAC: Two-Key CBC MAC
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Kaoru Kurosawa5  and Tetsu Iwata5
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Department of Computer and Information Sciences, Ibaraki University, 4-12-1 Nakanarusawa, 316-8511 Hitachi, Ibaraki, Japan |
Abstract
In this paper, we propose TMAC. TMAC is a refinement of XCBC such that it requires only two keys while XCBC requires three
keys. More precisely, TMAC requires only (k + n)-bit keys while XCBC requires (k + 2n)-bit keys, where k is the key length of the underlying block cipher E and n is its block length. We achieve this by using a universal hash function and the cost is almost negligible. Similar to XCBC,
the domain is 0, 1. and it requires no extra invocation of E even if the size of the message is a multiple of n.
Keywords CBC MAC - block cipher - provable security
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