A general reference on the subject of LFSRs, FCSRs, and AFSRs is the book. It follows that, as with LFSRs and linear complexity, any stream cipher whose N-adic complexity is low should not be used for cryptography.įCSRs and LFSRs are special cases of a very general algebraic construction of sequence generators called Algebraic Feedback Shift Registers (AFSRs) in which the integers are replaced by an arbitrary ring R and N is replaced by an arbitrary non-unit in R. If N > 1 to be successful and have quadratic time complexity. In sequence design, a Feedback with Carry Shift Register (or FCSR) is the arithmetic or with carry analog of a linear-feedback shift register (LFSR). ( February 2019) ( Learn how and when to remove this template message) Please help improve the article by providing more context for the reader. This article provides insufficient context for those unfamiliar with the subject.
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