Session is a cross-platform, end-to-end encrypted instant messaging application developed by the non-profit Session Technology Foundation. It emphasizes user confidentiality and anonymity by utilizing a decentralized network for message transmission. Unlike many messaging platforms, Session does not require a phone number or email address for account creation. Instead, it uses a randomly generated 66-character alphanumeric identifier called a Session ID. Communication between users, including messages, voice clips, photos, and files, is end-to-end encrypted using the Session Protocol. Session employs the Session Network, a decentralized, open-source blockchain network designed to transmit encrypted data specifically for the Session messenger.[1][2]
Development of Session began in 2018 under the Australia-based Oxen Privacy Tech Foundation. The project started as a fork of Signal to build on its foundation while addressing concerns about centralized metadata collection. The developers created the "Session Protocol," focusing on increased anonymity and decentralization. The initial release occurred in February 2020.[3]
In 2024, due to privacy legislation in Australia, the Session Technology Foundation was established in Switzerland to take over the development and publication of Session.[4]
Features
Anonymity: No phone number or email required; uses a 66-character Session ID.[5]
End-to-End Encryption: All communication, including text, voice, photos, and files is encrypted.[6]
Decentralized Network: Messages are routed through the Session Network, ensuring metadata minimization and privacy.[7]
Cross-Platform: Available on Android, iOS, Windows, macOS, and Linux.
Message Management: Supports text messages, voice clips, photos, files, and group chats.
Security Focus: Onion routing is used to prevent any server from knowing the origin or destination of messages.[8]
Usage
Session is used globally by individuals and communities that prioritize privacy, including journalists, activists, and security-conscious users. As of mid-2025, Session has over one million active users across multiple platforms.[9]
Limitations
No built-in two-factor authentication support.
Forward secrecy and deniable authentication are not fully implemented in all cases.
Some users report slower verification and smaller group capacities compared to commercial messaging apps.
Recent developments
October 9, 2025: Latest Android release, version 1.28.1, with crash fixes and performance improvements.[10]
2025: Migration to the Session Network, a decentralized, open-source blockchain network for message transmission.[11]
Continuous UI improvements, accessibility enhancements, and bug fixes across all platforms.
Reception
Technology analysts describe Session as a secure and privacy-focused alternative to mainstream messaging apps.[12]
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