Importance

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Abstract

A data management apparatus (10) is for managing data shared by a plurality of users. The data management apparatus (10) includes: an encryption processing unit (11) that encrypts the shared data; a coordinate acquisition unit (12) that, when one of the plurality of users has transmitted coordinates that have been pre-allocated thereto together with a request for decryption of the shared data, requests each of remaining users to transmit coordinates that have been pre-allocated thereto; and a decryption processing unit (13) that, when each of the remaining users has transmitted the coordinates that have been pre-allocated thereto, calculates a function from the coordinates transmitted by one user and the coordinates transmitted by the remaining users, and decrypts the encrypted shared data using a value obtained from the calculated function as a decryption key.

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First Claim