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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...

Kid Krypto - public key encryption

Encryption is the key to information security. The key to modern encryption is that using only public information, a sender can lock up their message in such a way that it can only be unlocked by the intended recipient. The resource begins with a detailed explanation of the activity and how the process of...

Sharing Secrets - Information Hiding Protocols

Cryptographic techniques enable information to be shared with other people, yet still maintain a surprisingly high level of privacy. This activity illustrates a situation where information is shared, and yet none of it is revealed: a group of students will calculate their average age without anyone having to reveal...

Selecting Search Results

This Barefoot Computing primary school resource helps children to Understand how search engines work. By acting as a ‘web crawler’ and collecting information across a small selection of web pages, they learn what in data is indexed by search engines and how this is used when a search query is received. As well as...

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