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OMAC: One-Key CBC MAC

2003; Springer Science+Business Media; Linguagem: Inglês

10.1007/978-3-540-39887-5_11

1611-3349

Tetsu Iwata, Kaoru Kurosawa,

Chaos-based Image/Signal Encryption

In this paper, we present One-key CBC MAC (OMAC) and prove its security for arbitrary length messages. OMAC takes only one key, K (k bits) of a block cipher E. Previously, XCBC requires three keys, (k+2n) bits in total, and TMAC requires two keys, (k+n) bits in total, where n denotes the block length of E. The saving of the key length makes the security proof of OMAC substantially harder than those of XCBC and TMAC.