[Resource Topic] 2007/380: X-FCSR: a new software oriented stream cipher based upon FCSRs

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X-FCSR: a new software oriented stream cipher based upon FCSRs

Authors: Francois Arnault, Thierry P. Berger, Cédric Lauradoux, Marine Minier


Feedback with Carry Shift Registers (FCSRs) are a promising alternative to LFSRs in the design of stream cipher. The previous constructions based on FCSRs were dedicated to hardware applications. In this paper, we will describe X-FCSR a family of software oriented stream cipher using FCSRs. The core of the system is composed of two 256-bits FCSRs. We propose two versions: X-FCSR-128 and X-FCSR-256 which output respectively 128 and 256 bits at each iteration. We study the resistance of our design against several cryptanalyses. In this way, we achieve a high throughput and secure stream ciphers suitable for software applications (6.3 cycles/byte).

ePrint: https://eprint.iacr.org/2007/380

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