Related-key Impossible Differential Attack on Reduced Round LBlock

Zhan  Ying-Jie; Guan  Jie; Ding  Lin; Zhang  Zhong-Ya

doi:10.3724/SP.J.1146.2012.00201

Volume 34 Issue 9

Oct. 2012

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Zhan Ying-Jie, Guan Jie, Ding Lin, Zhang Zhong-Ya. Related-key Impossible Differential Attack on Reduced Round LBlock[J]. Journal of Electronics & Information Technology, 2012, 34(9): 2161-2166. doi: 10.3724/SP.J.1146.2012.00201

Citation:

Zhan Ying-Jie, Guan Jie, Ding Lin, Zhang Zhong-Ya. Related-key Impossible Differential Attack on Reduced Round LBlock[J]. Journal of Electronics & Information Technology, 2012, 34(9): 2161-2166. doi: 10.3724/SP.J.1146.2012.00201

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Related-key Impossible Differential Attack on Reduced Round LBlock

doi: 10.3724/SP.J.1146.2012.00201

Zhan Ying-Jie^{* 关杰丁林张中亚
,},
Guan Jie,
Ding Lin,
Zhang Zhong-Ya

Received Date: 2012-03-02
Rev Recd Date: 2012-05-08
Publish Date: 2012-09-19

Abstract

Abstract

LBlock is a lightweight block cipher designed by Wu Wen-ling et al. in 2011. In this paper, a specific related-key differential is uesd to attack 19-round LBlock. The attack finds all the 80 bit keys in O(270.0) 19-round encryptions.The data complexity is 264 chosen plaintexts. Further more, a related-key impossible differential attack to 21-round Lblock is proposed. With 263 chosen plaintexts, the computing complexity of the attack is about O(271.5) 21-round encryptions for obtaining key.
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