The Signal Protocol (formerly known as the TextSecure Protocol) is a non- federated cryptographic protocol that provides end-to-end encryption for voice and instant messaging conversations. [2]

This document describes the "X3DH" (or "Extended Triple Diffie-Hellman") key agreement protocol. X3DH establishes a shared secret key between two parties who mutually authenticate each other …

libsignal contains platform-agnostic APIs used by the official Signal clients and servers, exposed as a Java, Swift, or TypeScript library. The underlying implementations are written in Rust: libsignal …

Mar 29, 2025 · Signal is widely regarded as one of the most secure messaging apps available today. It employs the Signal Protocol, an advanced end-to-end encryption (E2EE) framework that ensures …

The (original) Signal protocol is an open source secure messaging protocol that provides end-to-end authenticated encryption with forward security, post-compromise security, asynchronicity and many …

Mar 5, 2024 · Learn how Signal protects your communication from prying eyes. This article explains the Signal Protocol in detail, breaking down key exchange, prekeys, and how it keeps your messages …

Mar 8, 2025 · This article explores the origins, architecture, mechanisms, and impact of the Signal Protocol, explaining why it is considered the gold standard in digital communication security.

The Signal Protocol, widely recognized for powering Signal Messenger and other secure messaging apps, is designed to ensure that messages and calls remain confidential and tamper-resistant …

In this section, we discuss how the Signal protocol works for two parties, and we assume that Alice and Bob are willing to communicate over the Internet using the Signal App that uses the Signal protocol.

State-of-the-art end-to-end encryption (powered by the open source Signal Protocol) keeps your conversations secure. We can't read your messages or listen to your calls, and no one else can either.