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Encrypt your messages anywhere on the web with post-quantum cryptography 🦆 Quack — Encrypt the web itself. Want private conversations but can't get everyone to switch to Signal? Quack lets you send encrypted messages on ANY website — YouTube comments, Twitter DMs, Reddit posts, anywhere you can type. HOW IT WORKS • Type "Quack://" in any text field to open a secure composer • Write your message, hit encrypt, paste the ciphertext • Recipients with Quack automatically see the decrypted message • No one else can read it — not the platform, not hackers, not anyone WHY QUACK? ✓ No app switching — Use the sites you already use ✓ Quantum-resistant — ML-KEM-768 + AES-256-GCM cryptography (NIST approved) ✓ Wallet-grade security — Master password, auto-lock, encrypted vault ✓ Stealth mode — Hide who you're messaging from observers ✓ Group encryption — Share keys with trusted contacts ✓ Zero tracking — 100% client side PERFECT FOR • Private conversations on public platforms • Sharing sensitive info where others might see • Groups who want secure communication without changing apps • Anyone who values privacy but lives on the open web Your keys never leave your device. Your messages stay yours. Welcome to the encrypted web. Open-source at https://github.com/0xneves/quack