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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Two Algebraic Attacks Against the F-FCSRs Using the IV Mode
verfasst von : Thierry P. Berger, Marine Minier
Erschienen in: Progress in Cryptology - INDOCRYPT 2005
Verlag: Springer Berlin Heidelberg
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This article presents some new results concerning two algebraic attacks against the F-FCSR constructions proposed in [2]. We focus on the parameters of the stream ciphers proposed that permit to mount algebraic attacks when using the IV mode. The complexity obtained for the first attack described here is 2
45
binary instructions using 2
15
known IV values for the construction F-FCSR-SF1. All the proposed attacks are full key recovery attacks. We do not contest that the FCSRs are a good and new idea, we just say that the chosen parameters do not ensure the security level claimed.