| 摘要 |
PROBLEM TO BE SOLVED: To provide a card system for data communication high in security. SOLUTION: This system includes a card 1 which has a password code written and specifies the bearer and the reader-writer 2 which writes and reads information to and out of the card 1 and the reader-writer 2 is provided with a security function. In the reader-writer 2, a code is stored and the adequacy of the reader-writer 2 is judged from the code. The stored code is a time-series code which changes with time. The access states of the card 1 and a terminal computer 3 are recorded in the reader-writer 2. |
