User-Friendly Chat ( 6 . 857 final project )

Communicating confidentially on the internet is challenging. While strong cryptographic primitives like public-key encryption have been widely available for years, no simple end-to-end encrypted communication apps are widely used. For our 6.857 final project, we designed and implemented a small end-to-end encrypted chat app that builds on a PKI, Keytree, for security. By using an external PKI, our app and protocol are secure yet remain simple.