Crytpo - Chafing & Winnowing
Channel: conroywhitney
Date: 2013-12-03

Alice asks Charles to deliver a message to Bob. Charles has Alice write her message on scraps of paper. Charles then adds random words on other scraps of paper to confuse potential snoops. Eve tries to figure out what Alice wrote but is confused by all the random words. Bob, the intended recipient, can tell which words are from Alice and which are from Charles by recognizing Alice's handwriting. Bob is therefore able to figure out Alice's original message.