| 摘要 |
PROBLEM TO BE SOLVED: To allow for data sharing only within a group, and to automate creation of groups that target unspecified number having the same data attributes.SOLUTION: A query distribution/reply recovery section 50 gains access to user information held in an agent section 40, and creates a group in which the user information is the participation conditions. When a user participates in the group, a group key and a group policy are distributed to the agent section 40, an agent section 40 holding the group key is authenticated as a member of the group, and the data of the members is shared in the group based on the group policy. |
