Public key crypto

Today we did an in-class ativity about the concepts behind Diffie-Hellman Key Exchange, a method from public key cryptography that allows to parties communicating over an insecure channel to arrive at some shared secret - i.e. something they know that other people don't, even through these other people have observed all communications between the two parties.

demo

In addition to learning about public key cryptography, what I hope you got out of this activity is an appreciation for why we as computer scientists need to be able to apply mathematical reasoning and proof to study an activity (in this case, the lights out game) in order to be able to write programs about that activty or making use of that activity.