Define LFSR and its industry applications

What do you mean by the term LFSR? List down a few of its industry applications?

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The LFSR is a linear feed-back shift register where the input bit is driven through a linear function of on the whole shift register value. Coming to industrial applications, as far as I know, it is employed for encryption and decryption and in the BIST (built-in-self-test) based applications.

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