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Cyfr Privacy Policy

Last Updated: April 2026

What We Collect

What We Do NOT Collect

End-to-End Encryption

  • All messages are encrypted using the Signal Protocol with post-quantum Kyber cryptography
  • Encryption keys are generated and stored exclusively on your device
  • The server acts as an ephemeral relay — it temporarily holds encrypted messages until delivered, then deletes them
  • We cannot decrypt your messages. No one can, except the intended recipient.

Ephemeral Message Relay

  • Messages are held on the server only until your device confirms receipt (ACK)
  • After confirmation, messages are permanently deleted from our servers
  • Undelivered messages expire and are deleted after 30 days
  • There is no server-side message archive

Local Storage

Data Sharing

Data Retention

Security

Your Rights


Contact

For privacy questions or data requests, contact us at:

support@cyfrchat.com

Cloud City, LLC