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Cryptanalysis of Loiss Stream Cipher-Revisited

Author

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  • Lin Ding
  • Chenhui Jin
  • Jie Guan
  • Qiuyan Wang

Abstract

Loiss is a novel byte-oriented stream cipher proposed in 2011. In this paper, based on solving systems of linear equations, we propose an improved Guess and Determine attack on Loiss with a time complexity of 2 231 and a data complexity of 2 68 , which reduces the time complexity of the Guess and Determine attack proposed by the designers by a factor of 2 16 . Furthermore, a related key chosen IV attack on a scaled-down version of Loiss is presented. The attack recovers the 128-bit secret key of the scaled-down Loiss with a time complexity of 2 80 , requiring 2 64 chosen IV s. The related key attack is minimal in the sense that it only requires one related key. The result shows that our key recovery attack on the scaled-down Loiss is much better than an exhaustive key search in the related key setting.

Suggested Citation

  • Lin Ding & Chenhui Jin & Jie Guan & Qiuyan Wang, 2014. "Cryptanalysis of Loiss Stream Cipher-Revisited," Journal of Applied Mathematics, Hindawi, vol. 2014, pages 1-7, May.
    • Handle: RePEc:hin:jnljam:457275
    DOI: 10.1155/2014/457275
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