Impossible Differential Cryptanalysis of Reduced-Round LBlock

Abstract : In this paper, we improve the impossible differential attack on 20-round LBlock given in the design paper of the LBlock cipher. Using relations between the round keys we attack on 21-round and 22-round LBlock with a complexity of 269.5 and 279.28 encryptions respectively. We use the same 14-round impossible differential characteristic observed by the designers to attack on 21 rounds and another 14-round impossible differential characteristic to attack on 22 rounds of LBlock.
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Ioannis Askoxylakis; Henrich C. Pöhls; Joachim Posegga. 6th International Workshop on Information Security Theory and Practice (WISTP), Jun 2012, Egham, United Kingdom. Springer, Lecture Notes in Computer Science, LNCS-7322, pp.179-188, 2012, Information Security Theory and Practice. Security, Privacy and Trust in Computing Systems and Ambient Intelligent Ecosystems. 〈10.1007/978-3-642-30955-7_16〉
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Ferhat Karakoç, Hüseyin Demirci, A. Harmancı. Impossible Differential Cryptanalysis of Reduced-Round LBlock. Ioannis Askoxylakis; Henrich C. Pöhls; Joachim Posegga. 6th International Workshop on Information Security Theory and Practice (WISTP), Jun 2012, Egham, United Kingdom. Springer, Lecture Notes in Computer Science, LNCS-7322, pp.179-188, 2012, Information Security Theory and Practice. Security, Privacy and Trust in Computing Systems and Ambient Intelligent Ecosystems. 〈10.1007/978-3-642-30955-7_16〉. 〈hal-01534301〉

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