Nulkratos is a browser-based messenger where the server is completely blind to your messages. Every message is encrypted with AES-256-GCM in your browser before leaving your device. The server stores only ciphertext — meaningless without your PIN. • Argon2id key derivation (64MB memory) • HKDF ratchet for forward secrecy • Usernames stored as SHA-256 hashes • No phone number, no email, no tracking • 100% open source