> SecureJoin protocols provide a usable model for message end-to-end encryption which is secure against attackers trying to break authenticity, confidentiality or integrity of messages as can occur with compromised servers and networks. They are implemented, user-tested and continuously refined in production-releases of the cross-platform Delta Chat messenger. Other messenger implementors as well as researchers are welcome to submit remarks, questions or critique either through github or by contacting Delta Chat teams.