Abstract
The boomerang attack and the rectangle attack are two attacks that utilize differential cryptanalysis in a larger construction. Both attacks treat the cipher as a cascade of two sub-ciphers, where there exists a good differential for each sub-cipher, but not for the entire cipher. In this paper we combine the boomerang (and the rectangle) attack with related-key differentials.
The new combination is applicable to many ciphers, and we demonstrate its strength by introducing attacks on reduced-round versions of AES and IDEA. The attack on 192-bit key 9-round AES uses 256 different related keys. The 6.5-round attack on IDEA uses four related keys (and has time complexity of 288.1 encryptions). We also apply these techniques to COCONUT98 to obtain a distinguisher that requires only four related-key adaptive chosen plaintexts and ciphertexts. For these ciphers, our results attack larger number of rounds or have smaller complexities then all previously known attacks.
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Biham, E., Dunkelman, O., Keller, N. (2005). Related-Key Boomerang and Rectangle Attacks. In: Cramer, R. (eds) Advances in Cryptology – EUROCRYPT 2005. EUROCRYPT 2005. Lecture Notes in Computer Science, vol 3494. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11426639_30
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DOI: https://doi.org/10.1007/11426639_30
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