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| Related-key Impossible Differential Attack on Reduced Round LBlock |
| Zhan Ying-jie Guan Jie Ding Lin Zhang Zhong-ya |
| Electronic Technology Institute, Information Engineering University, Zhengzhou 450004, China |
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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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Received: 02 March 2012
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Corresponding Authors:
Zhan Ying-jie
E-mail: zhanyingjie1220@163.com
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2012, Vol. 34 
