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Title:
A Flaw in The Internal State Recovery Attack on ALPHA-MAC
Authors: Shengbao Wu, Mingsheng Wang, Zheng Yuan
Abstract:An distinguisher was constructed by utilizing a 2-round collision differential path of ALPHA-MAC, with about 2^{65.5} chosen messages and 2^{65.5} queries. Then, this distinguisher was used to recover the internal state(\cite{Yuan1},\cite{Yuan2}). However, a flaw is found in the internal state recovery attack. The complexity of recovering the internal state is up to 2^{81} exhaustive search. And the complexity of the whole attack will be up to 2^{67} chosen messages and 2^{81} exhaustive search. To repair the flaw, a modified 2-round differential path of ALPHA-MAC is present and a new distinguisher based on this path is proposed. Finally, an attack with about 2^{65.5} chosen messages and 2^{65.5} queries is obtained under the new distinguisher.
ePrint: https://eprint.iacr.org/2010/160
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