[Resource Topic] 2006/010: Finding Characteristic Polynomials with Jump Indices

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Finding Characteristic Polynomials with Jump Indices

Authors: Steve Babbage, Matthew Dodd


Jansen introduced a technique for building LFSRs that can be clocked a large number of times with a single simple operation. These may be useful in the construction of stream ciphers based on clock-controlled LFSRs. However, for LFSR sizes of typical interest, it appears generally hard to find such jumping LFSRs with particular desired parameters. In this note we explain a trick which we used to find the jumping LFSRs in MICKEY and MICKEY-128, and which may be useful for future applications.

ePrint: https://eprint.iacr.org/2006/010

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