Abstract
This paper presents a new deterministic attack against stream ciphers based on a nonlinear filter key-stream generator. By “deterministic” we mean that it avoids replacing the non-linear Boolean function by a probabilistic channel. The algorithm we present is based on a trellis, and essentially amounts to a Viterbi algorithm with a {0,1}- metric. The trellis is derived from the Boolean function and the received key-stream. The efficiency of the algorithm is comparable to Golic et al.’s recent “generalized inversion attack” but uses an altogether different approach: it brings in a novel cryptanalytic tool by calling upon trellis decoding.
A full version of this paper was published in: B. Honary (Ed.) Cryptography and Coding. Proceedings 8th IMA International Conference, Cirencester, UK, December 2001. LNCS 2260, Springer 2001.
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© 2002 Springer-Verlag Berlin Heidelberg
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Leveiller, S., Boutros, J., Guillot, P., Zémor, G. (2002). Cryptanalysis of Nonlinear Filter Generators with {0, 1}-Metric Viterbi Decoding. In: Kim, K. (eds) Information Security and Cryptology — ICISC 2001. ICISC 2001. Lecture Notes in Computer Science, vol 2288. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45861-1_5
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DOI: https://doi.org/10.1007/3-540-45861-1_5
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