Digital Secure Key Password [90% Official]

1. User enters password → unlock secure key. 2. Server sends random nonce. 3. Client signs nonce with DK (Ed25519). 4. Server verifies signature with public key registered during enrollment. | Threat | Mitigation | |--------|-------------| | Keylogger captures password | Secure key seed required; password alone insufficient | | Phishing site | Token bound to origin (WebAuthn-like binding) | | Server database leak | Only public key or seed verifier stored, not seed | | Replay attack | Time window or nonce freshness | | Lost secure key | Recovery mnemonic (offline, high entropy) | 5. User Interface Design (Example) Setup screen:

Digital Secure Key Password Login Master password: [************] digital secure key password

Authenticating... ✅ Key derivation (client side) import hashlib, hmac, secrets, time from cryptography.hazmat.primitives.kdf.scrypt import Scrypt def setup(password: str) -> dict: salt = secrets.token_bytes(32) kdf = Scrypt(salt=salt, length=32, n=2**20, r=8, p=1) password_key = kdf.derive(password.encode()) Server sends random nonce

[Finish Setup]

(Optional) Biometric unlock: [Use Face ID / Fingerprint] high entropy) | 5.

"mnemonic": "candle pilot storm ...", "new_public_key": "base64..."