Keybase

Keybase provides end‑to‑end encrypted messaging, file sharing, and team collaboration. It uses public‑key cryptography so that only the intended participants can read messages and access stored files, and the service itself cannot decrypt the content. Users can create teams for work, family, friends, or any group, and share photos, videos, documents, and other data securely.

The platform integrates with public identities from services such as Twitter and Reddit, allowing users to connect with broader communities while maintaining encryption. It also offers optional features like timed “exploding” messages for highly sensitive communication. All interactions are protected by the same cryptographic guarantees, and the client is available through a Tor hidden service for additional anonymity.

Keybase is open source and offered with a free tier, positioned as a stable solution for anyone needing private, encrypted communication and file storage across personal or collaborative contexts.