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:
Jul. 12, 2022
Filed:
Jul. 27, 2018
Nippon Telegraph and Telephone Corporation, Chiyoda-ku, JP;
Reo Yoshida, Musashino, JP;
Tetsutaro Kobayashi, Musashino, JP;
Yuto Kawahara, Musashino, JP;
Tomohide Yamamoto, Musashino, JP;
Hironobu Okuyama, Musashino, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Chiyoda-ku, JP;
Abstract
An encrypted communication is correctly decrypted even when key exchange completion notification is delayed. A key storage () stores at least one common key which is shared with another encrypted communication device. A key selecting unit () selects an encryption key from the at least one common key stored in the key storage (). An encrypting unit () generates encrypted data by encrypting, by using the encryption key, data to be transmitted to the other encrypted communication device. A transmitting unit () transmits, to the other encrypted communication device, the encrypted data with a key index, by which the encryption key is uniquely identified, added thereto. A receiving unit () receives the encrypted data with the key index added thereto from the other encrypted communication device. A key obtaining unit () obtains, from the at least one common key stored in the key storage (), a decryption key corresponding to the key index added to the encrypted data. A decrypting unit () decrypts the encrypted data by using the decryption key.