US Patent 11356455 Behavior-based authentication

Methods and systems for authenticating users based on user application activities are described herein. One or more questions and one or more answers may be generated and stored based on a history of user application activities associated with a user. The one or more questions and one or more answers may be generated randomly, and may relate to one or more other users. A request for access to a service may be received. Based on the request, a question associated with the history of user application activity may be selected and presented to the user. A candidate answer may be received from the user, and the user may be authenticated based on comparing the candidate answer to an answer associated with the question presented.