Group signature system, device, and program
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United States of America Patent
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Jun 12, 2012
Grant Date -
Jul 1, 2010
app pub date -
Jan 8, 2010
filing date -
Jul 11, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A group signature system includes a group manager device, a signer device and a verifier device capable of communicating with each other, each device using a group signature scheme. The group manager device generates a group secret key, a group public key, a member secret key and a signer tracing information. The signer device generates an encrypted text data of the signer tracing information, and a zero-knowledge proof showing that the signer device knows the member secret key and the encrypted text data is correctly generated based on the signer tracing information. The signer device transmits, to the verifier device, a group signature composed of the encrypted text data and the zero knowledge proof, and the message. The verifier device verifies correctness of the group signature and transmits the verified result to the signer device.
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