中文

Journal of Applied Sciences ›› 2006, Vol. 24 ›› Issue (5): 485-490.

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Safety of Variant Camellia against Square Attack

LI Qing-ling1, LI Chao1,2   

  1. 1. Department of Mathematics and System Science, National University of Defense Technology, Changsha 410073, China;
    2. National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
  • Received:2005-04-09 Revised:2005-07-05 Online:2006-09-30 Published:2006-09-30

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Abstract: By changing round functions of Camellia into round function with an S-P-S structure, a variant Camellia is obtained, denoted Camellia1.This paper discusses safety of Camellia against square attack and analyzes the influence of FL/FL-1 functions on the safety of Camellia and Camellia1 against square attacks.The results show that Camellia1 is safer than Camellia.The bit-rotation of FL/ FL-1 functions does not noticeably affect the safety of Camellia and Camellia1, while the layer of FL/FL-1 functions clearly affects the safety.

Key words: Square attack, Camellia algorithm, block cipher

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