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"A fascination with cryptography led high school math teacher Paul Kelley to develop a way to use the code-building practice to explain algebraic concepts to students at Anoka High School in Anoka, Minnesota. Kelley wanted to tap into ways math is used in everyday life — places where students would never give it a second thought — to spark their interest so they would stop asking how they would “use this stuff,” he said in an interview.
“I showed them, for example, how cryptography gets the credit card numbers from their computers to Amazon without the bad guys intercepting it, and all the mathematics that go into it,” said Kelley."
