Anonymous participation authority management system
AssigneeNEC Corporation
InventorKazue Sako
Life of this patent
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Abstract
A system allowing a participant to participate anonymously in a plurality of sessions but to be detected that the same participant has participated more than once in the same session is disclosed. The participant authorizes individual data using secret information depending on session-related information. The reception subsystem determines whether received data is anonymous participation data authorized by the participant subsystem and further determines whether anonymous signatures of arbitrary two pieces of anonymous participation data are signed by an identical participant subsystem. The anonymous signature may include data generated by raising a session-dependent base to a power dependent on the secret information.
Claims22
A system comprising:
- a participant subsystem that is authorized to anonymously participate in a plurality of sessions using secret information provided by a manager subsystem, all of said secret information being transmitted to the participant subsystem prior to participation in a first of said plurality of sessions, said secret information enabling participation in each of the plurality of sessions;
- and
- a reception subsystem;
- wherein the participant subsystem comprises:
- an anonymous signing section for authorizing particular individual data using the secret information depending on session-related information to produce anonymous participation data with an anonymous signature;
- wherein the reception subsystem comprises:
- an anonymous signature determining section for determining whether received data is said anonymous participation data with said anonymous signature;
- and
- a sender match determining section for determining whether anonymous signatures of two different pieces of anonymous participation data representing two different contents of individual data that are received in a same session of said plurality of sessions are signed by an identical participant subsystem;
- and
- wherein participation by said participant subsystem in a plurality of different sessions is concealed from said reception subsystem.
An anonymous participation authority management method for a system, the system comprising a participant subsystem that is authorized to anonymously participate in a plurality of sessions using secret information and a reception subsystem, the method comprising:
- at the participant subsystem,
- a) authorizing particular individual data using the secret information depending on session-related information to produce anonymous participation data with an anonymous signature, all of said secret information being transmitted to the participant subsystem prior to participation in a first of said plurality of sessions, said secret information enabling participation in each of the plurality of sessions;
- at the reception subsystem,
- b) determining whether received data is said anonymous participation data with said anonymous signature;
- and
- c) determining whether anonymous signatures of two different pieces of anonymous participation data representing two different contents of individual data that are received in a same session of the plurality of sessions are signed by an identical participant subsystem;
- wherein participation by said participant subsystem in a plurality of different sessions is concealed from said reception subsystem.
Dependencies are inferred from the claim text.