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In cryptography, F-FCSR is a stream cipher developed by Thierry Berger, François Arnault, and Cédric Lauradoux. The core of the cipher is a Feedback with Carry Shift Register (FCSR) automaton, which is similar to a LFSR, but they perform operations with carries so their transition function is nonlinear.

F-FCSR was one of the eight algorithms selected for the eCRYPT network's eSTREAM Portfolio, but it was later removed because further analysis showed weaknesses.[1]


  1. ^ Hell, Martin; Johansson, Thomas (2008). "Breaking the F-FCSR-H stream cipher in Real Time" (PDF). In Pieprzyk, Josef. Lecture Notes in Computer Science. ASIACRYPT 2008. 5350. Springer Berlin / Heidelberg. pp. 557–569. doi:10.1007/978-3-540-89255-7_34.