Improved Differential-Linear Cryptanalysis of 7-Round Chaskey with Partitioning

@inproceedings{Leurent2016ImprovedDC,
  title={Improved Differential-Linear Cryptanalysis of 7-Round Chaskey with Partitioning},
  author={Ga{\"e}tan Leurent},
  booktitle={EUROCRYPT},
  year={2016}
}
In this work we study the security of Chaskey, a recent lightweight MAC designed by Mouha et al., currently being considered for standardization by ISO/IEC and ITU-T. Chaskey uses an ARX structure very similar to SipHash. We present the first cryptanalysis of Chaskey in the single user setting, with a differential-linear attack against 6 and 7 rounds, hinting that the full version of Chaskey with 8 rounds has a rather small security margin. In response to these attacks, a 12-round version has… CONTINUE READING

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