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Biclique Cryptanalysis on the Full Crypton-256 and mCrypton-128

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  • Junghwan Song
  • Kwanhyung Lee
  • Hwanjin Lee

Abstract

Biclique cryptanalysis is an attack which reduces the computational complexity by finding a biclique which is a kind of bipartite graph. We show a single-key full-round attack of the Crypton-256 and mCrypton-128 by using biclique cryptanalysis. In this paper, 4-round bicliques are constructed for Crypton-256 and mCrypton-128. And these bicliques are used to recover master key for the full rounds of Crypton-256 and mCrypton-128 with the computational complexities of 2 253.78 and 2 126.5 , respectively. This is the first known single-key full-round attack on the Crypton-256. And our result on the mCrypton-128 has superiority over known result of biclique cryptanalysis on the mCrypton-128 which constructs 3-round bicliques in terms of computational time complexity.

Suggested Citation

  • Junghwan Song & Kwanhyung Lee & Hwanjin Lee, 2014. "Biclique Cryptanalysis on the Full Crypton-256 and mCrypton-128," Journal of Applied Mathematics, Hindawi, vol. 2014, pages 1-10, March.
    • Handle: RePEc:hin:jnljam:529736
    DOI: 10.1155/2014/529736
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