Math? Bob?

Bob certainly wants to understand cryptography. But he never expected he will have to learn math to do it. Come on, pals! Math?

When he first started reading cryptographic papers he gladly ignored the math parts. He was simply too eager to read all the messages he was supposed to exchange with Alice.

Unfortunately, the messages were utterly strange. Most of the time they were simply

Being stubborn, Bob decided to dive into the mathematics a little. It wasn't easy. But never underestimate Bob! He started with the greatest common divisor and is now working his way up.