Codemoji.org is a collaboration between Mozilla and ToDo that my team commissioned for our encryption campaign. Our goal was to teach the basics of how ciphers worked - the mathematical algorithms behind encryption. Based on simple substitution ciphers, CodeMoji is a web app that allows users to enter a message, which is then encrypted using emojis as the cipher. The receiver only understands the string of emojis they receive if they know the emoji you used to encrypt them, which you can guess with a hint. The app was a hit, with hundreds of thousands of messages successfully encrypted and 130 press mentions in 25 countries.
The app won the 2016 Shorty Award for social good.