Meet in the Park
Quantum-Safe Messaging Built on Trust
Secure messaging that protects against quantum computers.
Exchange keys in person. Message from anywhere.
The Problem
Traditional messaging apps rely on centralized servers to exchange encryption keys. You're trusting a company with your most private communications.
Worse, quantum computers will soon break the encryption protecting today's messages. Data harvested now can be decrypted later - you need quantum-resistant protection today.
What is Post-Quantum Messaging?
Post-quantum messaging uses cryptographic algorithms resistant to attacks from quantum computers. Unlike traditional encryption (RSA, ECC), it relies on mathematical problems that even quantum computers cannot efficiently solve.
Our app implements NIST-approved algorithms: ML-KEM-1024 (FIPS 203) for key exchange and ML-DSA-87 (FIPS 204) for digital signatures - protecting your messages against both current and future threats.
Why This Matters
- 1 "Harvest now, decrypt later" - Adversaries store encrypted data today to decrypt when quantum computers arrive
- 2 Future-proof security - Your conversations stay protected for decades to come
- 3 NIST standardized - We use officially approved algorithms (FIPS 203/204)
How It Works
Three simple steps to quantum-safe communication.
Meet in Person
Meet your contact face-to-face. Scan each other's QR codes to exchange public keys directly - no server involved.
Keys Stay Local
Your private keys never leave your device. No server ever sees them. No company can access your messages.
Message Securely
Send encrypted messages from anywhere. Only your contact can decrypt them - now and in the quantum future.
Quantum-Resistant Security
We use NIST-approved post-quantum cryptography standards:
ML-KEM-1024
FIPS 203 Module-Lattice Key Encapsulation. Securely establishes shared secrets resistant to quantum attacks.
ML-DSA-87
FIPS 204 Module-Lattice Digital Signatures. Authenticates messages so you know who sent them.
Forward Secrecy (Double Ratchet)
Each message uses a unique encryption key derived through a KEM-based Double Ratchet protocol. If a key is ever compromised, past and future messages remain protected.
Every message is encrypted with AES-256-GCM and signed. If anyone tampers with a message, you'll know. The implementation has been security audited with all findings resolved.
Why This Approach?
The name reflects our core principle: trust is established in person, not through servers.
When you meet someone and exchange keys face-to-face, there's no man-in-the-middle. No company policy. No government request. Just you and your contact.
That moment of physical presence creates an unbreakable chain of trust for all future communication, combining in-person verification with quantum-resistant encryption for maximum security.
Features
Everything you need for truly private communication, built from the ground up.
Messaging
- ✓ End-to-end encrypted messages
- ✓ Read receipts
- ✓ Disappearing messages (1h to 30 days)
- ✓ Encrypted image sharing
- ✓ Push notifications
Security
- ✓ Post-quantum cryptography (FIPS 203/204)
- ✓ Forward secrecy (Double Ratchet)
- ✓ Safety number verification
- ✓ Encrypted backup & restore
- ✓ Security audited
Privacy
- ✓ QR code pairing (no phone numbers)
- ✓ Keys never leave your device
- ✓ Block unwanted contacts
- ✓ EXIF metadata stripping
- ✓ No account or registration
Current Status
We're building in public. Here's where we are.
Completed
- ✓ Post-quantum cryptography (ML-KEM-1024, ML-DSA-87)
- ✓ Forward secrecy with Double Ratchet protocol
- ✓ QR code pairing and verification codes
- ✓ Safety number verification (MITM protection)
- ✓ Encrypted backup & restore (Argon2id)
- ✓ Read receipts and disappearing messages
- ✓ Encrypted media sharing with EXIF stripping
- ✓ Push notifications
- ✓ Security audit completed (13 findings fixed)
- ✓ Android APK available for testing
Coming Next
- → iOS TestFlight distribution
- → Accessibility improvements (WCAG 2.1 AA)
- → Group messaging
- → Certificate pinning
Get Early Access
Android APK is available now. Be among the first to experience quantum-safe messaging. We're looking for privacy-conscious individuals who want to help test and provide feedback.
Get the Android APK or join the iOS waitlist
Request Access →We respect your privacy. No spam, ever.
meetinthepark@proton.me