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SACRYPT
2009
Springer

A New Approach for FCSRs

14 years 22 days ago
A New Approach for FCSRs
The Feedback with Carry Shift Registers (FCSRs) have been proposed as an alternative to Linear Feedback Shift Registers (LFSRs) for the design of stream ciphers. FCSRs have good statistical properties and they provide a built-in non-linearity. However, two attacks have shown that the current representations of FCSRs can introduce weaknesses in the cipher. We propose a new “ring” representation of FCSRs based upon matrix definition which generalizes the Galois and Fibonacci representations. Our approach preserves the statistical properties and circumvents the weaknesses of the Fibonacci and Galois representations. Moreover, the ring representation leads to automata with a quicker diffusion characteristic and better implementation results. As an application, we describe a new version of F-FCSR stream ciphers.
François Arnault, Thierry P. Berger, C&eacu
Added 27 May 2010
Updated 27 May 2010
Type Conference
Year 2009
Where SACRYPT
Authors François Arnault, Thierry P. Berger, Cédric Lauradoux, Marine Minier, Benjamin Pousse
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