In one implementation, form field(s) of a form of a website or application are populated with data obtained using a digital identity, and the populated form field(s) are submitted to the website or application. A form field specification specifying information about the form fields of the form is obtained. A user selects or creates a digital identity. Data is obtained using the digital identity, and the data is used to provide values to the form. The data is submitted to the website or application. In another implementation, a username and password are automatically generated. The username and password that are generated meet parameters that may be specified by the website or application. The username and password are submitted to the website or application for a purpose such as registration or authentication, and stored away for future authentication.