Signal Protocol: A Technical Deep Dive into Modern Encrypted Messaging The Signal Protocol is the de facto standard for end-to-end encrypted messaging. It powers Signal, WhatsApp, Google Messages, and Skype's Private Conversations — collectively securing billions of messages every day. But what makes it so effective? In this article, we'll explore the protocol's architecture, its key cryptographic primitives, and why it represents the state of the art in asynchronous messaging security. ...