RANDOM VALUE IDENTIFICATION DEVICE, RANDOM VALUE IDENTIFICATION SYSTEM, AND RANDOM VALUE IDENTIFICATION METHOD

摘要

It is not possible to identify a suitable random value that can increase the validity of data after adding a random data and causing the concealment of original data values. In the present invention, authorization information indicating at last one attribute that a user authorizes to be disclosed is associated with a user identifier and recorded; an attribute name indicating a first attribute is received; a second attribute is identified corresponding to a cumulative number wherein each attribute is indicated among the attributes that the authorization information indicating the first attribute indicates; an attribute value corresponding to the first attribute and second attribute of the user identified by the user identifier associated with the authorization information is acquired for each authorization information indicating the second attribute; the correlation between the first attribute and the second attribute is identified on the basis of the acquired attribute value; and a random number is generated for each attribute within a random value range that is a range that the random number can take between the first attribute and the second attribute and that is identified on the basis of the identified correlation.