PURPOSE: To record even such data for requiring the security on an optical IC card by providing a ciphering key on the IC part of the card when the information is recorded and reproduced at the optical recording part of the card.
CONSTITUTION: The information to be recorded is supplied to the IC part of an IC optical card 1 from a personal computer 4 via an optical IC card reader/ writer 5. The information is ciphered in the card 1 and the information aquired by this ciphering is sent to the reader/writer 5 and the ciphered information is written in the optical recording part of the card 1. The information is ciphered by the secret key of the IC part included in the card 1. Since this key is not viewed from an outside, the ciphered information can be decoded unless only when the secret key is used. The data recorded on the card 1 are read by the computer 4 when the card 1 is put into the reader/writer 5. Then the read information is decoded by the key of the IC part of the card 1.
KITAJIMA HIROSHI
KOSHIBA YOSHIHITO
