Security & privacy · NIST Level 5 post-quantum

Built to protect you

Encryption by default, keys you control, and a blockchain designed so private data never goes on-chain. Here’s how it works.

The model

How Lemniscate keeps you safe

End-to-end encryption

Messages are sealed on your device with post-quantum hybrid encryption: ML-KEM-1024 (NIST security category 5 — the highest defined level) combined with ECDH P-256, content encrypted with AES-256-GCM. Only you and your recipient can read them.

Keys on your device

Your private key is generated and stored locally — it never reaches our servers. Non-custodial: not even we can access your account or wallet.

Servers see only ciphertext

Our relay transports encrypted blobs and never holds readable message content. Call audio/video flows peer-to-peer and isn’t stored.

Private data never touches the blockchain

Your chats, files and wallet contents are never stored on the blockchain. The chain only keeps a tiny digital fingerprint (a checksum) that proves nothing was tampered with — it can never be turned back into your content. Everything personal stays encrypted on your device.

Metadata minimization

Sealed sender is on by default: messages arrive without a readable sender on the envelope, so the server can't log who talks to whom. Built in — not an afterthought.

Aligned with NSA CNSA 2.0

Our building blocks — ML-KEM-1024 (FIPS 203) for key exchange and AES-256 for content — are the exact algorithms the NSA’s Commercial National Security Algorithm Suite 2.0 mandates for U.S. national security systems up to TOP SECRET. The same math that protects classified military communications seals your chats. (An algorithm property — not a government certification of Lemniscate.)

Post-quantum, Level 5

Our key exchange runs two locks at once: a post-quantum one (ML-KEM-1024, NIST category 5 of 5) and a classical one (ECDH P-256). An attacker would have to break both — and traffic recorded today can't be unlocked by future quantum computers ("harvest now, decrypt later").

Ephemeral by design

Disappearing messages, view-once media, app lock and screenshot protection put you in control of what lingers.

Two-factor login

An optional second step at sign-in via an authenticator app (Google Authenticator, iPhone codes and more), plus one-time backup codes.

Chain security

A secure network

Proof-of-Authority

Blocks are sealed by authorized validators operated by the team; every full node independently verifies the chain.

Decentralization

An open validator set across providers and regions — no single point of control or failure.

Audited approach

Contracts and core modules follow an audit-first approach as they move to mainnet.

🔎 Responsible disclosure

Found a vulnerability? We appreciate responsible disclosure. Email [email protected] with details and we’ll respond promptly. Please don’t exploit or disclose issues publicly before they’re fixed.

Privacy you can verify

Read the details or just start using it — your keys, your data, by default.

Open app Privacy policy
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Security — FAQ

Can Lemniscate read my messages?
No. Private messages are end-to-end encrypted; your private key never leaves your device and our servers only ever see ciphertext.
Do you sell my data?
No — we never sell data and never analyse your content for advertising. Ads are only a plain banner strip in Free and Premium, Business is completely ad-free, and we count ad clicks only anonymously, never who clicked. We keep as little as possible and delete it on our retention schedule.
What about content moderation?
Private chats use on-device filters and user reports; public content is moderated server-side. Child-safety cases are reported to NCMEC as required by law.
How do you handle law-enforcement requests?
We respond only to lawful, properly scoped requests and can only ever provide the limited data we actually hold. Law-enforcement guide →
What if my device is compromised?
Encryption protects data in transit and on our servers, but it can't protect a device that is itself compromised. We're honest about that limit and don't claim to prevent device-level interception.
What if I lose my keys?
Recover your account with your 12-word secret phrase or encrypted backup file. There is no password reset, because we never hold your keys.
Is Lemniscate quantum-safe?
Yes. Message encryption and all key distribution use a post-quantum hybrid — ML-KEM-1024 at NIST security category 5, the highest defined level — so traffic recorded today can't be unlocked by future quantum computers. The one classical-only piece is the WebRTC transport handshake in live calls, a browser limitation that applies to every messenger today.
Which algorithms protect my chats?
Hybrid end-to-end encryption: P-256 ECDH combined with post-quantum ML-KEM-1024, content encrypted with AES-256-GCM.
What if I lose my device?
Restore your account anywhere with the 12-word phrase; an optional encrypted backup brings your chats back.
Where do the servers run?
On our own hardware in the EU and the US — no big-tech cloud in the message path.