Council – Encrypted Messaging

Council is a private messaging app built around encryption keys you control.
Create a network, set a passphrase, share it with the people you trust — and
only they can read what's inside. Council never sees the keys.

Every Council network is locked by a passphrase you choose. Your device
derives the encryption keys from it using modern key‑stretching, and the keys
never leave your device. When messages travel through Council's servers, they
are already sealed; the server relays ciphertext and nothing more.

When you're done with a network, you can destroy it. Keys are erased from
your device, and only unreadable encrypted bytes remain on the server.

Built for tomorrow's threats, today
Council uses post‑quantum cryptography across the protocol — ML‑KEM‑768
(Kyber) for key encapsulation, AES‑256‑GCM for messages, SHA‑512 for key
derivation. These are the same algorithm classes governments are moving to
in anticipation of future quantum computers. Each device also holds its own
secret, so an attacker would need both your passphrase AND access to your
unlocked device to read a message.

No social graph
Council does not import your contacts. There is no friend‑finder, no public
username directory, no "people you may know." You join a network by getting
its passphrase from a member, not by being found by phone number. Your phone
number is used only for sign‑in — never shared with other Council users,
never used to identify you inside a network.

What you get
• User‑controlled encryption keys — generate, share, destroy
• Post‑quantum cryptography (ML‑KEM‑768) throughout the protocol
• Device‑bound secrets — a passphrase alone cannot decrypt
• Encrypted media — photos, videos, GIFs, files sealed on your device before upload
• Encrypted group voice calls inside a network
• Secure network deletion — keys destroyed, only ciphertext remains
• No phone‑based social graph, no contact import
• Group authentication preserves member deniability — messages prove they came from the group, not which specific member

Council Pro
A Council Pro subscription unlocks unlimited encrypted networks. Available as
an annual subscription, or redeemable via a license key for organizations.

Privacy Policy: https://councilapp.com/pp
Terms of Service: https://councilapp.com/tos
Support: https://support.councilapp.com