| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem that in order for data to be shared among a plurality of specific users, i.e., among specific organizations it is currently necessary to use a secrete key suitable for the users among a plurality of secrete keys used, giving rise to the need for the consideration of a management method therefor, and that there is no method for dynamically discriminating the secrete keys used.SOLUTION: To address the above problem, the present invention uses, in addition to an organization classification key shared among specific users, a distribution key management file for classifying organizations to specify an organization concerned and enable data to be shared among specific organizations. More suitably, a distribution key is used for each of a plurality of specific users, and encryption/decryption is applied among the plurality of specific users. Furthermore, use of data in the distribution key management file makes it possible to dynamically specify a distribution key used in the encryption/decryption.</p> |
