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:
Jun. 26, 2013
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A constant multiplier inputs a base and a modulo n, performs modular exponentiation modulo n with a prescribed constant as the exponent and with base a, and outputs the result of this calculation as base b. A personal key converter inputs a personal key d and calculates a personal key d' as the quotient when d is divided by the prescribed constant. A correction key generator generates a correction key d″ as the remainder of the aforementioned division. A first modular exponentiation unit performs modular exponentiation base b with d′ as the exponent. A second modular exponentiation unit performs modular exponentiation base a with d″ as the exponent, and outputs a correction value. A correction calculation unit multiplies the outputs of the first and second modular exponentiation units and outputs the result as the encryption processing result.