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:
Feb. 04, 1997
Filed:
Oct. 06, 1994
Toshikazu Yamaguchi, Kanagawaken, JP;
Kiyoto Tanaka, Kanagawaken, JP;
Nippon Telegraph & Telephone Corp., Tokyo, JP;
Abstract
A cipher communication system and scheme capable of realizing the cipher communication without affecting the already existing application programs and hardware, and establishing a synchronization at the start and end of the cipher communication. In the cipher communication, the session key generated by the key distribution center are obtained and shared at the first and second terminals at a timing of a request for establishing a cipher communication session between the first and second terminals, and then the cipher communication between the first and second terminals is carried out by using the shared session key. The synchronization at the start and end of the cipher communication is established by the matching of the synchronization data transmitted from the first terminal to second terminal or its enciphered form with the return data from the second terminal to the first terminal which is either the synchronization data as received at the second terminal, or its enciphered form depending on the communication state of the second terminal.