Abstract: Systems and methods are disclosed herein to generate unique high entropy deterministic authentication tokens or passwords derived from user account information and a high entropy random number secured on a user device. Systems and methods can further include a counting variable such as a nonce to generate more than one unique high entropy deterministic authentication token for a single account, for instance, to facilitate updating the authentication token for that account to a new unique authentication token. From the user perspective, systems and methods can be used to provide an authentication token manager and/or password manager, where the user is able to access user accounts via a single user-provided authentication such as a master password or biometric data. Because the tokens/passwords are generated deterministically, they need not be stored by the token/password manager.