The Interesting
I have always wondered how the little card swipers keep my information secret, so this is cool. I like the idea of the tunnel/hallway with the door in the back.
The Challenging
I don't understand why knowing that r1 and r2 factors of s mod n makes it so we know that x1 is r1^2 and x2 is r2^2. This seems like it's going to be really easy once I hear you explain it, but right now it's confusing! That made it hard for me to understand the Feige-Fiat-Shamir identification scheme and the following identification scheme they explained
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