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:
Jun. 13, 2023
Filed:
Jun. 17, 2021
Nippon Telegraph and Telephone Corporation, Chiyoda-ku, JP;
Reo Yoshida, Musashino, JP;
Tetsutaro Kobayashi, Musashino, JP;
Yuto Kawahara, Musashino, JP;
Hitoshi Fuji, Musashino, JP;
Kazuki Yoneyama, Hitachi, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Chiyoda-ku, JP;
Abstract
Plurality of users share a common key while permitting change of members sharing the common key and computational complexity required for key exchange is reduced. Rand care computed based on a twisted pseudo-random function in a first key generation step. sid is generated based on a target-collision resistant hash function and (sid, R, R) is transmitted to communication devices Uin a session ID generation step. Tand T' are computed based on a pseudo-random function in a representative second key generation step. Tis computed based on the pseudo-random function in a general second key generation step. k′ is computed based on the twisted pseudo-random function and T′is computed with respect to each j in a third key generation step. Kand kare computed in a first session key generation step. A common key Kis generated based on the pseudo-random function in a second session key generation step.