Post-quantum E2E
ML-KEM-1024 with Dilithium signatures — built to survive quantum computers.
Post-quantum · Sealed sender · Tor
Umbera™
A private messenger with post-quantum encryption, sender concealment, P2P calls and Tor. No phone number, no traces.
A license bought on this site works only in the Android app from Google Play. On iPhone, subscribe in the App Store.
01 — What is Umbera
A modern E2E messenger where even the server doesn't know who talks to whom.
You see
Can you send the contract by tonight?
Already sent — and only to you.
The server sees
Sealed Sender
The server doesn't know who writes to whom — the sender is hidden even from us.
P2P calls
Audio and video are encrypted between the phones — even the relay sees only ciphertext.
Tor built in
Route all traffic through Tor with a single switch.
Quant address
No phone number — a protected wallet-style quant… address instead.
E2E files
Photos, videos and voice notes are encrypted on the sender's device.
02 — Proof
Don't trust us. Verify.
The code, the tests and the traffic checks are public. Anyone can repeat every step.
Only the recipient can read a message
- Every message is sealed on the sender's phone with X25519 + Kyber (ML-KEM-1024) and AES-256-GCM.
- The server receives only a mailbox address and ciphertext — no sender, no recipient.
- 7 tests show that any other key fails, breaking X25519 alone is not enough, and tampering is rejected.
Only the participants can hear a call
- Audio and video are encrypted with DTLS-SRTP directly between the two phones — keys never leave them.
- The relay forwards only encrypted packets and cannot open them.
- Call setup is encrypted and signed, so the server cannot become a middleman.
03
Getting started
01
Install the app
From Google Play or the App Store — sign up without a phone number.
02
Free trial
The trial starts automatically on first launch — no card required.
03
Subscription or code
Then subscribe in Google Play or the App Store. A code bought on this site (USDT for now, card payments coming soon) works only in the Android app from Google Play; on iPhone, subscribe in the App Store.
Ready for real privacy?
Umbera is on Google Play and the App Store.
A license bought on this site works only in the Android app from Google Play. On iPhone, subscribe in the App Store.