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An Efficient State Recovery Attack on X-FCSR-256

  • Paul Stankovski
  • Martin Hell
  • Thomas Johansson
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5665)

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.

Keywords

stream cipher FCSR X-FCSR cryptanalysis state recovery 

References

  1. 1.
    Arnault, F., Berger, T.: F-FCSR: Design of a new class of stream ciphers. In: Gilbert, H., Handschuh, H. (eds.) FSE 2005. LNCS, vol. 3557, pp. 83–97. Springer, Heidelberg (2005)CrossRefGoogle Scholar
  2. 2.
    Arnault, F., Berger, T., Lauradoux, C.: Update on F-FCSR stream cipher. eSTREAM, ECRYPT Stream Cipher Project, Report 2006/025 (2006), http://www.ecrypt.eu.org/stream
  3. 3.
    Arnault, F., Berger, T.P., Lauradoux, C., Minier, M.: X-FCSR - a new software oriented stream cipher based upon FCSRs. In: Srinathan, K., Pandu Rangan, C., Yung, M. (eds.) INDOCRYPT 2007. LNCS, vol. 4859, pp. 341–350. Springer, Heidelberg (2007)CrossRefGoogle Scholar
  4. 4.
    ECRYPT. eSTREAM: ECRYPT Stream Cipher Project, IST-2002-507932, http://www.ecrypt.eu.org/stream/
  5. 5.
    Hell, M., Johansson, T.: Breaking the F-FCSR-H stream cipher in real time. In: Pieprzyk, J. (ed.) ASIACRYPT 2008. LNCS, vol. 5350, pp. 557–569. Springer, Heidelberg (2008)CrossRefGoogle Scholar
  6. 6.
    Jaulmes, E., Muller, F.: Cryptanalysis of ECRYPT candidates F-FCSR-8 and F-FCSR-H. eSTREAM, ECRYPT Stream Cipher Project, Report 2005/046 (2005), http://www.ecrypt.eu.org/stream
  7. 7.
    Jaulmes, E., Muller, F.: Cryptanalysis of the F-FCSR stream cipher family. In: Preneel, B., Tavares, S. (eds.) SAC 2005. LNCS, vol. 3897, pp. 20–35. Springer, Heidelberg (2006)CrossRefGoogle Scholar
  8. 8.
    Klapper, A., Goresky, M.: 2-adic shift registers. In: Anderson, R.J. (ed.) FSE 1993. LNCS, vol. 809, pp. 174–178. Springer, Heidelberg (1994)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Paul Stankovski
    • 1
  • Martin Hell
    • 1
  • Thomas Johansson
    • 1
  1. 1.Dept. of Electrical and Information TechnologyLund UniversityLundSweden

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