Understanding Cryptography by Christof Paar and Jan Pelzl - Chapter 2 Solutions - Ex2.7

- 2 mins

Exercise 2.7

Compute the first two output bytes of the LFSR of degree 8 and the feedback polynomial from Table 2.3 where the initialization vector has the value FF in hexadecimal notation.

Note: The polynomial referred to is .

Solution

This solution is verified as correct by the official Solutions for Odd-Numbered Questions manual.

This LFSR derived from this polynomial can be visualised as such:

LFSR

The sequence generated by , which is , is as follows:

The resulting first two output bytes are .


Thomas Busby

Thomas Busby

I write about computing stuff

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