It's a good question. There are a couple of ways to do it: https://en.wikipedia.org/wiki/Scrambler#Types_of_scramblers https://en.wikipedia.org/wiki/Scrambler

It's a good question. There are a couple of ways to do it: https://en.wikipedia.org/wiki/Scrambler#Types_of_scramblers https://en.wikipedia.org/wiki/Scrambler#Types_of_scramblers