IC CARD HAVING SECURITY STATUS WITH TIME LIMIT

摘要

PROBLEM TO BE SOLVED: To prevent an IC card from being illegally used after expiration by a person other than the genuine owner. SOLUTION: With respect to an IC card having a timer function, a security status indicating an authentication valid state is kept only for a prescribed time after expiration of the authentication of a card owner and the term of validity of the card owner authentication is set to a master key file IEF00 and application key files IEF01, IEF02 and IEF03.