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An efficient state recovery attack on X-FCSR-256

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (2009) 5665 LNCS 23-37
DOI: 10.1007/978-3-642-03317-9_2
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Abstract

We describe a state recovery attack on the X-FCSR-256 stream cipher of total complexity at most 257.6. This complexity is achievable by requiring 249.3 output blocks with an amortized calculation effort of at most 28.3 table lookups per output block using no more than 233 table entries of precomputational storage. © 2009 Springer Berlin Heidelberg.

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Stankovski, P., Hell, M., & Johansson, T. (2009). An efficient state recovery attack on X-FCSR-256. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 5665 LNCS, pp. 23–37). https://doi.org/10.1007/978-3-642-03317-9_2

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