Abstract
Due to its widespread deployment in mobile telephony, the block cipher KASUMI is a prominent target for cryptanalysts. While the cipher offers excellent resistance to differential and linear cryptanalysis, in the related-key model there have been several impressive cryptanalytic results. In this paper we revisit these related-key attacks and highlight a small, but important, detail in the specification of KASUMI for the algorithm A5/3; namely that a 64- and not a 128-bit session key is used. We show that existing related-key attacks on KASUMI in the literature are (negatively) impacted by this feature and we provide evidence that repairing these attacks will be difficult.
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Nguyen, P.H., Robshaw, M.J.B., Wang, H. (2011). On Related-Key Attacks and KASUMI: The Case of A5/3. In: Bernstein, D.J., Chatterjee, S. (eds) Progress in Cryptology – INDOCRYPT 2011. INDOCRYPT 2011. Lecture Notes in Computer Science, vol 7107. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25578-6_12
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DOI: https://doi.org/10.1007/978-3-642-25578-6_12
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