Bitmessage is a P2P communications protocol used to send encrypted messages to another person or to many subscribers. It is decentralized and trust-less, meaning that you need-not inherently trust any entities like root certificate authorities. It uses strong authentication which means that the sender of a message cannot be spoofed, and it aims to hide ???non-content??? data, like the sender and receiver of messages, from passive eavesdroppers like those running warrant-less wiretapping programs