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Truncated differential based known-key attacks on round-reduced SIMON. (English) Zbl 1398.94121

Summary: At Crypto 2015, C. Blondeau et al. [Lect. Notes Comput. Sci. 9215, 455–474 (2015; Zbl 1375.94104)] proposed a truncated-differential-based known-key attack on full PRESENT, a nibble oriented lightweight block cipher with an SPN structure. The truncated difference they used is derived from the existing multidimensional linear characteristics. An innovative technique of their work is the design of a MITM layer added before the characteristic that covers extra rounds with a complexity lower than that of a generic construction. We notice that there are good linear hulls for bit-oriented block cipher SIMON corresponding to highly qualified truncated differential characteristics. Based on these characteristics, we propose known-key distinguishers on round-reduced SIMON block cipher family, which is bit oriented and has a Feistel structure. Similar to the MITM layer, we design a specific start-from-the-middle method for pre-adding extra rounds with complexities lower than generic bounds. With these techniques, we launch basic known-key attacks on round-reduced SIMON. We also involve some key guessing technique and further extend the basic attacks to more rounds. Our known-key attacks can reach as many as 29/32/38/48/63-rounds of SIMON32/48/64/96/128, which comes quite close to the full number of rounds. To the best of our knowledge, these are the first known-key results on the block cipher SIMON.

MSC:

94A60 Cryptography

Citations:

Zbl 1375.94104
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