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TMAC: Two-Key CBC MAC

2003; Springer Science+Business Media; Linguagem: Inglês

10.1007/3-540-36563-x_3

ISSN

1611-3349

Autores

Kaoru Kurosawa, Tetsu Iwata,

Tópico(s)

Chaos-based Image/Signal Encryption

Resumo

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.

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