Abstract
In this paper we examine the redesign of LOKI, LOKI 91 proposed in [5]. First it is shown that there is no characteristic with a probability high enough to do a successful differential attack on LOKI 91. Secondly we show that the size of the image of the F-function in LOKI 91 is 8/13×232. Finally we introduce a chosen plaintext attack that reduces an exhaustive key search on LOKI 91 by almost a factor 4 using 233+2 chosen plaintexts.
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© 1993 Springer-Verlag Berlin Heidelberg
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Knudsen, L.R. (1993). Cryptanalysis of LOKI 91. In: Seberry, J., Zheng, Y. (eds) Advances in Cryptology — AUSCRYPT '92. AUSCRYPT 1992. Lecture Notes in Computer Science, vol 718. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-57220-1_62
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DOI: https://doi.org/10.1007/3-540-57220-1_62
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