The keyword, which holds the coefficients and initial states of the LFSR, can be managed in a few bits and stored in first-in first-out memory array. Consequently, the aggregate polynomial has a set of unpredictable and nonlinear sequences with high statistical randomness. That is, each polynomial generates a linear set of sequences. This work introduces a private key, which is a collection of keywords, to program the feedback coefficients and initial states of the LFSR, where each keyword modulates the LFSR with a different polynomial of the same degree. Besides, an LFSR limits the sequences of scan-for-test patterns. ![]() Conventionally, a linear feedback shift register (LFSR) constitutes linear sets of sequences with predictable periods, which are considered vulnerable to intruders.
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