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:
May. 17, 2022
Filed:
Apr. 27, 2018
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
A key distribution system includes a representative user terminal, a server apparatus, and an (n+1)-th user terminal. The representative user terminaluses a public key for the (n+1)-th user terminaland information for identifying the (n+1)-th user terminalto encrypt key information with a predetermined encryption function in Certificate-less Encryption to obtain ciphertext. The server apparatussends the ciphertext to the (n+1)-th user terminalwhen the (n+1)-th user terminalis added. The (n+1)-th user terminaluses a complete secret key for the (n+1)-th user terminaland the information for identifying the (n+1)-th user terminalto decrypt the ciphertext with a predetermined decryption function to obtain the key information.