INFORMATION MANAGEMENT SYSTEM, INFORMATION MANAGEMENT DEVICE, INFORMATION MANAGEMENT PROGRAM

摘要

PROBLEM TO BE SOLVED: To answer to the social request for safe and efficient execution of updating of distributed information sharing secret by secret sharing scheme.

SOLUTION: A dealer device 2 acquires distributed information from respective preservation server devices 3j (0≤j≤4) managing effective distributed information and restores original secret information and restores random number information on the basis of this restored secret information. Random number information other than this restored random number information is newly generated, and update information of distributed information is generated by exclusive OR among distributed information to be updated, the restored random number information, and the newly generated random number information. Each preservation server device 3j receives update information from the dealer device 2 and uses the update information to update original distributed information by an update processing part 3j2.

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