HIERARCHIC ARRANGEMENT FOR THE VERIFICATION AND RENEWAL OF SECURITY DATE IN ELECTRONIC FUND TRANSFER SYSTEMS

摘要

The invention provides an electronic fund transfer and data protection system comprising; a plurality of portable data carriers; a plurality of transaction terminals; self-contained portable storage units for storing security test numbers and a list of transaction events data obtained from said transaction terminals; computer units with data storage space for receiving transaction event data from the self-contained storage units and for imparting new test numbers thereto; and an originating station where security test numbers are generated and electrically passed to the computer units via dedicated communication lines.