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New CBC-MAC Forgery Attacks
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New CBC-MAC Forgery Attacks
Karl Brincat5  and Chris J. Mitchell6
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Visa International EU, PO Box 253, London, W8 5TE, UK |
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Information Security Group, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK |
Abstract
This paper is concerned with a particular type of attack against CBC-MACs, namely forgery attacks, i.e. attacks which enable an unauthorised party to obtain a MAC on a data string. Existing forgery attacks against CBC-MACs
are briefly reviewed, together with the effectiveness of various countermeasures. This motivates the main part of the paper,
where a family of new forgery attacks are described, which raise serious questions about the effectiveness of certain countermeasures.
The views expressed in this paper are personal to the author and not necessarily those of Visa International
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