Information management method and information processing device

摘要

An information management method and an information processing device functioning as a node are provided to enable an effective use of information distributed to, and shared with, a plurality of nodes on a network and to enable maintenance of security against leakage of information by controlling information retention. This management method of information gathers information distributed to, and shared with, a plurality of the nodes on a network and holds the information in a state accessible from other nodes to a temporary information memory unit when generating restored information. The information management method is also characterized in setting a flag for showing a history of the information and immediately discarding the information in the case that the retention of restored information becomes improper from a view point of contents of the flag.

主权项

1. An information management method in a network system in which divided-information is distributed to and stored in a plurality of nodes, the method comprising:
an information restoration step for causing a first node of the plurality of nodes to collect the divided-information and generate restored-information when no other node has the restored-information; an information acquiring step for acquiring the restored-information from one of the plurality of nodes when the node has the restored-information; a temporary storage step for storing the restored-information, generated in the information restoration step of the first node, in a temporary information storage section in the first node with a flag indicating a history of a process which was performed in the first node to the restored-information, the restored-information being transmitted by the first node to one or more nodes when the first node receives a request for restored-information, the one or more nodes being different from the first node and being among the plurality of nodes storing the divided-information; a restored-information modifying step for, when the restored-information is modified in the first node, causing the first node to modify the flag to indicate content of a modification which has been made to the restored-information and store the modified restored-information in the temporary storage section with the modified flag; and a restored-information obtaining step for causing the one or more nodes to access the first node and obtain the modified restored-information and the content of the modification, which are for generating the restored-information in the one or more nodes.