US Patent 8140854 User authentication method and user authentication system

The present invention is a user verification method and a user verification system, in which a password derivation pattern for each user is pre-registered into a verification server, and when a user is to use the system, the verification server generates a presented pattern and presents this to the user, the user inputs a password corresponding to the user's own password derivation pattern for the presented pattern, the verification server performs verification of the inputted password based on the presented pattern and the user's own password derivation pattern that was registered, and a verification result is then notified to the usage target system.