A method for providing a user system access to a resource includes obtaining configuration data identifying devices at the user system; receiving a request from the user system for access to a resource; applying a function to the configuration data to generate a current fingerprint; comparing the current fingerprint to a reference fingerprint associated with the resource; determining a degree of similarity between the current fingerprint and the reference fingerprint; and granting access to the resource in response to the degree of similarity between the current fingerprint and the reference fingerprint.