return "encrypted_seed": encrypted_seed, "salt": salt, "public_key": public_key, "recovery_mnemonic": mnemonic_from_seed(secure_key_seed)
secure_key_seed = secrets.token_bytes(32) encrypted_seed = xor_bytes(secure_key_seed, password_key) # simplified digital secure key password
[Generate Secure Key]
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: Server sends random nonce
(Optional) Biometric unlock: [Use Face ID / Fingerprint] high entropy) | 5.
# For signature mode private_key = Ed25519PrivateKey.from_private_bytes(secure_key_seed) public_key = private_key.public_key()