| 摘要 |
PURPOSE: To prevent illicit use by using a secret key so as to cipher data, sending the data to a data communication equipment via a communication channel and decoding the received data through the use of the secret key. CONSTITUTION: A data communication equipment 15 is used to apply the use of data to a database 12 via a communication channel 17. In this case, the user ciphers his own secret key by using an open key of the database 12 and sends the cryptographic key to the database 12. The database 12 decodes the ciphered secret key of the user by using an exclusive key, ciphers the data applied for the use by using the secret key of the user to be decoded and sends the ciphered data to the equipment 15 via the channel 17. The user receiving the data ciphered by using his own secret key uses a user terminal equipment 18 to decode the ciphered data ciphered by using his own secret key. Moreover, a charge center 13 is provided to the database 12 to be used for account of the charge attending intake/issue of orders. |
