# QryptChat — Full Content

> Quantum-resistant, end-to-end encrypted messaging by Profullstack, Inc.
> Concatenated Markdown of the key public pages for LLM/RAG ingestion.

## Home

QryptChat is quantum-resistant, end-to-end encrypted messaging. It uses NIST-approved
post-quantum algorithms — ML-KEM-1024 (CRYSTALS-Kyber) for key encapsulation and
CRYSTALS-Dilithium for digital signatures — to protect messages, files, and calls against
both current attackers and future quantum computers. It is free, open source (MIT),
self-hostable, and accessible over Tor.

How it works:

1. Register with a phone number. A one-time SMS code verifies you — no email and no password.
2. Keys are generated on your device. Your ML-KEM-1024 key pair never leaves your device, so
   QryptChat cannot read your messages (zero-knowledge architecture).
3. Every message is encrypted end-to-end — text, files, and voice & video calls.
4. Stay private everywhere: use the web app or the Tor onion service, and self-host from the
   open-source repository.

Built for privacy-conscious individuals, journalists, activists, and security-minded teams.

## About

QryptChat is built by Profullstack, Inc. (founded 2024). Team: Anthony Ettinger
(Founder & Developer) and mrpthedev (Developer). Mission: make communication that stays
private for decades using cryptography already standardized by NIST, kept open source so it
can be independently verified and self-hosted.

## Security

- Key encapsulation: ML-KEM-1024 (CRYSTALS-Kyber), NIST FIPS 203.
- Digital signatures: CRYSTALS-Dilithium (ML-DSA), NIST FIPS 204.
- Coverage: text messages, file transfers, and 1:1 and group voice & video calls are end-to-end encrypted.
- Key custody: private keys are created and stored on-device; the server only ever sees ciphertext.
- Why post-quantum: defends against "harvest now, decrypt later" attacks.
- Privacy & resilience: phone-number auth (no email/password), no ads or trackers, Tor access,
  a public warrant canary, and MIT-licensed self-hostable source.
- Responsible disclosure: security@qrypt.chat and /.well-known/security.txt.

## Pricing & Premium

QryptChat is free and open source (MIT). All core messaging, calling, and encryption features
are free, and you can self-host. An optional paid Premium tier is in development.

| Feature | Free | Premium (coming soon) |
| --- | --- | --- |
| Post-quantum end-to-end encryption | yes | yes |
| Encrypted voice & video calls | yes | yes |
| Disappearing messages & file sharing | yes | yes |
| Tor access & self-hosting | yes | yes |
| Price | $0 forever | TBA |

## FAQ

Q: Is QryptChat free?
A: Yes — free and open source (MIT). Optional Premium tier is in development.

Q: What platforms does QryptChat run on?
A: Any modern web browser, plus installable as a PWA on Android, iOS, and desktop, and reachable over Tor.

Q: What makes QryptChat quantum-resistant?
A: It encrypts with ML-KEM-1024 (CRYSTALS-Kyber) and CRYSTALS-Dilithium, protecting against
"harvest now, decrypt later" attacks.

Q: How is QryptChat different from Signal?
A: It uses post-quantum cryptography by design, is MIT-licensed and self-hostable, and is accessible over Tor.

Q: Does QryptChat require an email or password?
A: No — sign up with a phone number and an SMS code.

Q: Can I self-host QryptChat?
A: Yes — https://github.com/profullstack/qryptchat-web

Q: Can QryptChat read my messages?
A: No — keys are generated on your device and the server only handles ciphertext.

## Company

- Name: Profullstack, Inc.
- Product: QryptChat
- Founded: 2024
- Team: Anthony Ettinger (Founder & Developer), mrpthedev (Developer)
- Support: support@qrypt.chat
- Security: security@qrypt.chat
- Business: business@qrypt.chat
- GitHub: https://github.com/profullstack/qryptchat-web
- License: MIT
- Pricing: Free / open source