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. 24, 2019
Filed:
Dec. 20, 2016
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
An information processing terminal generates a shared key by a public key cryptosystem using an identifier. The information processing terminal calculates a first calculation value by using an algorithm that outputs an element on an extension field of a prime field from two points on an additive cyclic group on an elliptic curve that is defined by the prime field. The information processing terminal holds the first calculation value. The information processing terminal calculates a second calculation value from a variable using an identifier of a sharer that shares the shared key, a private key of the information processing terminal, and the algorithm. The information processing terminal generates the shared key by executing a final exponentiation to each of the exponentiation of the first calculation value and the second calculation value.