| http://www.w3.org/ns/prov#value | - Moreover, the user ID encrypting unit 420 encrypts the information including the user ID and the derivative value based on the encryption key predetermined by the key creating apparatus 104 and registered with the encryption key storage unit 465, and thereby creates the encrypted ID. The expected value creating unit 425 adopts a constitution similar to the derivative ID creating unit 125 and creat
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