Abstract
Piccolo is a lightweight block cipher, with a fixed 64-bit block size and variable key length 80- or 128-bit, which was proposed at CHES 2011. The iterative structure of Piccolo is a variant of Generalized Feistel Network. The transformation utilizing different-size-word based permutation improves diffusion property of Piccolo and the simple key schedule algorithm reduces hardware costs. By analyzing the distribution of the subkeys, we present a biclique cryptanalysis of full round Piccolo-80 without postwhitening keys and 28-round Piccolo-128 without prewhitening keys. The attacks are respectively with data complexity of 248 and 224 chosen ciphertexts, and with time complexity of 278.95 and 2126.79 encryptions.
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Wang, Y., Wu, W., Yu, X. (2012). Biclique Cryptanalysis of Reduced-Round Piccolo Block Cipher. In: Ryan, M.D., Smyth, B., Wang, G. (eds) Information Security Practice and Experience. ISPEC 2012. Lecture Notes in Computer Science, vol 7232. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29101-2_23
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DOI: https://doi.org/10.1007/978-3-642-29101-2_23
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