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:
Aug. 14, 2001
Filed:
Oct. 15, 1998
Masaki Kyojima, Nakai-machi, JP;
Rumiko Kakehi, Nakai-machi, JP;
Koji Takeda, Nakai-machi, JP;
Taro Terao, Nakai-machi, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A decryption method and device, an access right authentication method and apparatus for securely transmitting specific information to the decryption device while retaining blindness of data that is assigned to be decrypted. An input unit of the decryption device receives a cipher text C′ generated by providing a blind effect to a cipher text C and second decryption information d,from a user and transmits them to a decryption unit. The decryption unit takes a modulus n and first decryption information d,from a modulus storage unit and a first decryption information storage unit, respectively. The decryption unit then calculates the expression R=C′,mod n and outputs R through an output unit. If a combination of a cipher text C and the second decryption information d,is correct, a correct decryption result is available.