Strong Encryption Many wallets use relatively weak password hashing in order to support a wide range of devices, such as PBKDF2 or similar. Sparrow is desktop focussed and uses a configuration of Argon2 (winner of the Password Hashing Competition in 2015) configured to take at least 500ms on modern hardware to derive the key from your password in order to unlock your wallet. Even if it only contains public keys, that data is still worth protecting properly.