RECOGNITION METHOD FOR POSSESSOR OF CARDS

摘要

PURPOSE:To securely recognize the right possessor of cards without increasing the burden on a user in an information processing service system using the cards. CONSTITUTION:A processing/storage means is embedded in the belongings 1 (watch, ring and the like) of the possessor of the cards 2. The belongings 1 and the cards 2 previously share the same initial values of ciphered key data and output feedback data. At the time of using the cards 2, the belongings 1 cipher and update the output feedback data with ciphered key data and transmit the updated data to the cards 2. The cards 2 cipher and update the output feedback data with ciphered key data and compare the updated data with the updated data from the cards 1. When they coincide, the cards concerned are set to a usable state. Here, the access of an information processor 3 by the cards 2 becomes possible.