The Interesting
It's pretty incredible that modern technology can do something in a short time that used to take months, like finding the S-boxes. I wonder what this theory would be like if each S-box could have more input and output bits, so it was more updated with newer capabilities. Would the code still be fairly easy to break for a computer?
The Challenging
To be honest, I read 4.2 and 4.4 multiple times each, but I still could not figure out how this DES system works, why there are different rounds, and how the different strings and S boxes play in. I think I would really benefit from you demonstrating this process in class.
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