Cipher is a standalone, end-to-end encrypted messenger built by Arcane Systems. No phone numbers, no ad networks, no data to sell — just a fast, private place to talk.
They want your phone number. They map your contacts. They log who you talk to and when, even if they can't read what you say. We wanted something with a smaller footprint — an app where the server is deliberately kept ignorant, and where the privacy claims are structural, not just policy.
Cipher encrypts every message on your device before it leaves, using the same Signal Protocol trusted by security professionals worldwide. What reaches our servers is ciphertext bound for a recipient — nothing we could read, and nothing worth stealing.
Your private keys are generated and stored only on your phone. We publish just your public prekey bundle so others can start a session with you.
X3DH establishes a session; the Double Ratchet rotates keys with every message, giving forward secrecy and post-compromise security.
Cipher stores and forwards encrypted blobs. It never sees plaintext, never holds your keys, and keeps no readable history.
A lightweight push wakes the app to fetch a waiting message. No always-on socket, no background polling — private and efficient.
Cipher is in early access on Android. Your feedback shapes what comes next.