| 摘要 |
<p>PURPOSE:To provide the recording and reproducing system which can limit the users of data recorded in a card or registered persons to record data in the card. CONSTITUTION:This system is provided with a cipher processing part 42 to cipher data to be recorded in a prescribed cipher sequence with an arbitrary cipher key, recording means to record the ciphered data in an optical memory part 3 of a card 1, reading means to read the data recorded in the optical memory part 3, and decipher processing part 43 to decipher the data read by the reading means according to a prescribed decipher sequence with an arbitrary decipher key, and the cipher key and decipher key are composed of keys in a pair of public cipher systems of which contents are different from each other.</p> |
