My new book about secure and end-to-end encrypted (E2EE) messaging will be released soon. It addresses E2EE messaging protocols, like OpenPGP and S/MIME, as well as OTR, Signal, iMessage, Wickr, Threema, Telegram, and many more. The core of the book is the Signal protocol that represents the state-of-the-art in E2EE messaging as it stands today. Besides the Signal messenger, it is also used in WhatsApp, Viber, Wire, and the Facebook Messenger. The book can already be preordered from Artech House UK or US.