Abstract: The art and science of secure communication is called cryptography. To send someone a secret message, you need two things: (1) a way to scramble the message ("the cryptosystem"), and (2) a piece of information that tells the sender and the receiver just how the scrambling is done ("the key"). Keeping the key in the right hands and out of the wrong hands is a major problem for cryptographers, and public key cryptography is a solution to this problem that is at work on every computer and in every network in the world. This talk is about Chocolate Key Cryptography, which is a way to describe a certain public key cryptosystem that is easy to learn, fun, interactive, and delicious.