Paper 2009/167
A new approach for FCSRs
François Arnault, Thierry Berger, Cédric Lauradoux, Marine Minier, and Benjamin Pousse
Abstract
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.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- Stream ciphersFCSR
- Contact author(s)
- benjamin pousse @ xlim fr
- History
- 2009-04-10: received
- Short URL
- https://ia.cr/2009/167
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2009/167,
author = {François Arnault and Thierry Berger and Cédric Lauradoux and Marine Minier and Benjamin Pousse},
title = {A new approach for {FCSRs}},
howpublished = {Cryptology {ePrint} Archive, Paper 2009/167},
year = {2009},
url = {https://eprint.iacr.org/2009/167}
}
