User Device For Acquiring Verifiable Claims, System Including Said User Device, And Method For Acquiring Verifiable Claims

Abstract: This user device comprises a holding means for holding confidential information, a generation means for generating a generator, a computation means for deriving a commitment corresponding to the generator on the basis of the generator and the confidential information, and an acquisition means for transmitting an acquisition request that includes the generator and the commitment corresponding to the generator to a first external device to thereby acquire a verifiable claim (VC) that includes the generator and the commitment corresponding to the generator. The value of the generator used by the acquisition means in order to acquire the new VC is different from the value of the generator used by the acquisition means in order to acquire the VC in the past.

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