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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© 2012 IFIP International Federation for Information Processing
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Karakoç, F., Demirci, H., Harmancı, A.E. (2012). Impossible Differential Cryptanalysis of Reduced-Round LBlock. In: Askoxylakis, I., Pöhls, H.C., Posegga, J. (eds) Information Security Theory and Practice. Security, Privacy and Trust in Computing Systems and Ambient Intelligent Ecosystems. WISTP 2012. Lecture Notes in Computer Science, vol 7322. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30955-7_16
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DOI: https://doi.org/10.1007/978-3-642-30955-7_16
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-30954-0
Online ISBN: 978-3-642-30955-7
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