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INDOCRYPT
2003
Springer

Stronger Security Bounds for OMAC, TMAC, and XCBC

11 years 5 months ago
Stronger Security Bounds for OMAC, TMAC, and XCBC
OMAC, TMAC and XCBC are CBC-type MAC schemes which are provably secure for arbitrary message length. In this paper, we present a more tight upper bound on Advmac for each scheme, where Advmac denotes the maximum success (forgery) probability of adversaries. Our bounds are expressed in terms of the total length of all queries of an adversary to the MAC generation oracle while the previous bounds are expressed in terms of the maximum length of each query. In particular, a significant improvement occurs if the lengths of queries are heavily unbalanced. Key words: OMAC, TMAC, XCBC, modes of operation, block cipher, provable security.
Tetsu Iwata, Kaoru Kurosawa
Added 07 Jul 2010
Updated 07 Jul 2010
Type Conference
Year 2003
Where INDOCRYPT
Authors Tetsu Iwata, Kaoru Kurosawa
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