Techniques described herein may be used to enable users to access services protected by two-factor security systems without having to provide additional authentication information (e.g., a portion of the user's social security number, biometric information, etc.). An application server may provide one or more services, such as a social networking service, an online banking service, etc. When a user device attempts to access the service, the user may provide a username and password, to the application server, as the first factor of a two-factor authentication process required to access the service. However, instead of requiring the user to provide additional authentication information (e.g., the second factor), a network authentication server, the application server, and the user device may collaborate to automatically provide the additional authentication information.