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Title:
On the security margin of MAC striping
Authors: Thomas Eisenbarth, Aaron Meyerowitz, Rainer Steinwandt
Abstract:MAC striping has been suggested as a technique to authenticate encrypted payloads using short tags. For an idealized MAC scheme, the probability of a selective forgery has been estimated as \binom{\ell+m}{m}^{-1}\cdot 2^{-m}, when utilizing MAC striping with \ell-bit payloads and m-bit tags. We show that this estimate is too optimistic. For m\le\ell and any payload, we achieve a selective forgery with probability \ge \binom{\ell+m}{m}^{-1}, and usually many orders of magnitude more than that.
ePrint: https://eprint.iacr.org/2015/089
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