The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 2015
Filed:
Dec. 21, 2007
Takuya Yoshida, Inagi, JP;
Minako Tada, Komae, JP;
Norikazu Hosaka, Fuchu, JP;
Koji Okada, Tokyo, JP;
Takehisa Kato, Fuchu, JP;
Takuya Yoshida, Inagi, JP;
Minako Tada, Komae, JP;
Norikazu Hosaka, Fuchu, JP;
Koji Okada, Tokyo, JP;
Takehisa Kato, Fuchu, JP;
KABUSHIKI KAISHA TOSHIBA, Tokyo, JP;
TOSHIBA SOLUTIONS CORPORATION, Tokyo, JP;
Abstract
A purchaser apparatus stores 'anonymous order information including an order ID and purchaser identity verifying information' and 'purchaser identity proving secret information'. A shop apparatus stores “anonymous order information including an order ID and purchaser identity verifying information”. If necessary, a purchaser sends a request including an order ID and zero knowledge proving information that a purchaser knows the purchaser identity proving secret information, from a purchaser apparatus to a shop apparatus. A shop apparatus verifies the zero knowledge proving information, based on purchaser identity verifying information retrieved from an order ID included in the request. Therefore, the unlinkability for past use is eliminated if necessary, and inconvenience caused by the unlinkability is eliminated.