Messaging,
Decentralized.
Delta Chat transforms email into a modern, secure messenger. No phone number, no central servers, no bullshit.
Decentralized
No central servers. Your messages stay on your device and move through the global email network.
End-to-End Encrypted
Automatic encryption with OpenPGP. Only you and your chat partner can read the messages.
Universal Reach
Message anyone with an email address, even if they don't have Delta Chat installed.
Webxdc Apps
Powerful mini-apps and games that run directly inside your chat threads.
Documentation
Delta Chat uses the massive infrastructure of email to provide a chat experience that is truly independent. It's the only messenger that works even if the other person doesn't use it.
Certificate Structure
Understand the structure of an Autocrypt v2 OpenPGP certificate — its keys, subkeys, and signatures.
Comparisons
How Autocrypt v2 compares to other end-to-end encryption systems like Signal, PGP, and Autocrypt v1.
Design Choices
Why specific algorithms, parameters, and structures were chosen for Autocrypt v2.
Reference Implementations
Explore the Rust and Python reference implementations for creating and managing Autocrypt v2 certificates.
Key Rotation & Ratcheting
Learn how Autocrypt v2 automatically rotates encryption keys using a deterministic ratchet, providing forward secrecy.
Autocrypt v2
Learn about Autocrypt v2 — the next generation of automatic email encryption with post-quantum security and reliable key deletion.