Abstract
In 2007, S. Kiyomoto, T. Tanaka and K. Sakurai presented the stream cipher K2 at SECRYPT. In this paper, we present two attacks on simplified versions of K2. We show a differential chosen IV attack with key recovery on a simplified version with 5 initialization clocks with time complexity of 28.1 clocks. For a simplified version with 7 initialization clocks, we show a distinguishing attack with time complexity of 234.8 clocks.
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References
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Priemuth-Schmid, D. (2012). Attacks on Simplified Versions of K2. In: Bouvry, P., Kłopotek, M.A., Leprévost, F., Marciniak, M., Mykowiecka, A., Rybiński, H. (eds) Security and Intelligent Information Systems. SIIS 2011. Lecture Notes in Computer Science, vol 7053. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25261-7_9
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DOI: https://doi.org/10.1007/978-3-642-25261-7_9
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-25260-0
Online ISBN: 978-3-642-25261-7
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