US Patent 10136322 Anonymous authentication system

A system and method anonymously authenticate utilizing multiple pre-shared identification keys with external visual identifier. Two keys are pre shared with a server and are integrated into memory on a controller, and external visual identifiers are affixed to the outside of the controller. The server authenticates the mobile device by checking that the external visual identifiers are appropriately linked to the pre-shared keys within a control memory structure, and a second control memory structure is initiated utilizing the shared key and no user-identifying information.