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Paper: Distinguishing and Forgery Attacks on Alred and Its AES-based Instance Alpha-MAC

Authors:
Zheng Yuan
Keting Jia
Wei Wang
Xiaoyun Wang
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URL: http://eprint.iacr.org/2008/516
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Abstract: In this paper, we present new distinguishers of the MAC construction \textsc{Alred} and its specific instance \textsc{Alpha}-MAC based on AES, which is proposed by Daemen and Rijmen in 2005. For the \textsc{Alred} construction, we describe a general distinguishing attack which leads to a forgery attack directly. The complexity is $2^{64.5}$ chosen messages and $2^{64.5}$ queries with success probability 0.63. We also use a two-round collision differential path for \textsc{Alpha}-MAC, to construct a new distinguisher with about $2^{65.5}$ queries. The most important is that the new distinguisher can be used to recover the internal state, which is an equivalent secret subkey, and leads to a second preimage attack. Moreover, the distinguisher on \textsc{Alred} construction is also applicable to the MACs based on CBC and CFB encryption mode.
BibTeX
@misc{eprint-2008-18092,
  title={Distinguishing and Forgery Attacks on Alred  and Its AES-based Instance Alpha-MAC},
  booktitle={IACR Eprint archive},
  keywords={secret-key cryptography / Distinguishing attack, Forgery attack, \textsc{Alred} construction, \textsc{Alpha}-MAC, AES},
  url={http://eprint.iacr.org/2008/516},
  note={ xiaoyunwang@mail.tsinghua.edu.cn 14225 received 4 Dec 2008, last revised 12 Dec 2008},
  author={Zheng Yuan and Keting Jia and Wei Wang and Xiaoyun Wang},
  year=2008
}