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Breaking the stream ciphers F-FCSR-H and F-FCSR-16 in real time

Publiceringsår: 2011
Språk: Engelska
Sidor: 427-445
Publikation/Tidskrift/Serie: Journal of Cryptology
Volym: 24
Nummer: 3
Dokumenttyp: Artikel i tidskrift
Förlag: Springer


The F-FCSR stream cipher family has been presented a few years ago. Apart from some flaws in the initial propositions, corrected in a later stage, there are no known weaknesses of the core of these algorithms. Two variants, F-FCSR-H and F-FCSR-16, were proposed in the eSTREAM project, and F-FCSR-H v2 is one of the ciphers selected for the eSTREAM portfolio.

In this paper we present a new and severe cryptanalytic attack on the F-FCSR stream cipher family. We give the details of the attack when applied to F-FCSR-H v2 and F-FCSR-16. The attack requires a few Mbytes of received sequence, and the complexity is low enough to allow the attack to be performed on a single PC within seconds.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • Stream cipher
  • F-FCSR-H
  • F-FCSR-16
  • Linearization
  • Cryptanalysis


  • Crypto and Security-lup-obsolete
  • ISSN: 1432-1378

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