![]() There are three versions of the algorithm, and Bitwarden has implemented Argon2id as recommended by OWASP. We recommend that you increase the value in increments of 100,000 and test all of your devices.Īrgon2 is the winner of the 2015 Password Hashing Competition. ![]() More KDF iterations will increase both the time it will take an attacker to crack a password and the time it will take a legitimate user to log in. So long as the user does not set this value lower, the implementation is FIPS-140 compliant, but here are some tips should you choose to change your settings: The resultant value after all iterations is your master key, which acts as input for the master password hash used to authenticate that user whenever they log in ( learn more).īy default, Bitwarden is set to iterate 600,000 times, as recommended by OWASP for HMAC-SHA-256 implementations. This value is again salted with your username and hashed a configurable number of times ( KDF iterations). PBKDF2, as implemented by Bitwarden, works by salting your master password with your username and running the resultant value through a one-way hash algorithm (HMAC-SHA-256) to create a fixed-length hash. Password-Based Key Derivation Function 2 (PBKDF2) is recommended by NIST and, as implemented by Bitwarden, satisfies FIPS-140 requirements so long as default values are not changed. ![]()
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