| 摘要 |
An information and communication system or the like which handles an attribute, at the same time enables the attribute not being made a public information, is efficient, and does not require a database should be provided. Pseudonym and validation tag generation means output validation tag including a commitment of a secret key of a user apparatus and a pseudonym, credential generation means outputs a signed document corresponding to a validation tag and a pseudonym as a credential, a user apparatus transmits a signed document to a verifier apparatus, a user apparatus proves to a verifier apparatus that a validation tag is a commitment of a secret key, a verifier apparatus verifies a signed document, and a verifier apparatus verifies the proof that a validation tag is a commitment of a secret key.
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