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The Peruvian Coin Flip - Cryptographic Protocols

This activity shows how to accomplish a simple, but nevertheless seemingly impossible task -making a fair random choice by flipping a coin, between two people who don’t necessarily trust each other, and are connected only by a telephone. The resource begins with a detailed explanation of the activity and suggestions for how to carry out the activity with the class. The variations and extensions cover Boolean logic gates. There is further information about cryptography and logic gates and worksheets for use in the class room. This collection of twenty activities from Computer Science Unplugged is designed to aid the teaching and learning of computer science through engaging games and puzzles using cards, string, crayons and lots of running around.

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