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CHES '02 Revised Papers from the 4th International Workshop on Cryptographic Hardware and Embedded Systems
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IEEE Transactions on Computers
Algebraic attacks on stream ciphers with linear feedback
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
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FSE'05 Proceedings of the 12th international conference on Fast Software Encryption
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FSE'05 Proceedings of the 12th international conference on Fast Software Encryption
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Mutually Clock-Controlled Feedback Shift Registers Provide Resistance to Algebraic Attacks
Information Security and Cryptology
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SETA '08 Proceedings of the 5th international conference on Sequences and Their Applications
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ACISP'07 Proceedings of the 12th Australasian conference on Information security and privacy
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INDOCRYPT'07 Proceedings of the cryptology 8th international conference on Progress in cryptology
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AFRICACRYPT'12 Proceedings of the 5th international conference on Cryptology in Africa
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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 245 binary instructions using 215 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.