| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an advertiser with all history information about marketing of the company's own and a part of history information about marketing of any other company of the same trade. <P>SOLUTION: Based on an advertiser ID of the company's own, an advertiser ID of any other company of the same trade as the company and trade attributes ID of the company and the other company, a service server 1 generates first to third encryption keys. The service server 1 refers to an information disclosure degree DB110 and, for the history information of the company's own, encrypts an item, which is set to be disclosed only to the company itself, using the first encryption key. For the history information of the other company, the service server encrypts an item, which is set to be disclosed only to the other company, using the second encryption key. In the history information, both the items encrypted by the first and second encryption key and items not encrypted by the first and second encryption key are encrypted using the third encryption key and the encrypted history information is transmitted to an advertiser terminal 2. The advertiser terminal 2 generates first and second decryption keys based on the advertiser ID of the company itself and the trade attribute ID, to which the company itself belongs, and decrypts the encrypted history information using these decryption keys. <P>COPYRIGHT: (C)2011,JPO&INPIT |
