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README.md

Polytool

Polytool is a python program designed to find weight-4 polynomial multiples of LFSR feedback polynomials. It is based on Algorithm 11 given in [1]. Preferably, this program should be run with pypy.

Usage

  1. Convert the polynomial to decimal notation, i.e. compute P(2) and set the variable poly accordingly.
  2. The mask can be manually set, but the automatic setting should give the best performance.
  3. Run pypy polytool.py.
  4. Once finished, the program will output the lowest-degree multiple.

NOTE: If second stage fails (or has very few entries compared to first stage), you are using a too small initial table size.

#References [1] http://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=4934002&fileOId=4934007

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πŸ”© Weight-4 polynomial-multiple finder

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