System and scheme of cipher communication
First Claim
1. A method of cipher communication, comprising the steps of:
- connecting a plurality of terminals with a key distribution center through a network;
generating a session key to be used in a cipher communication between first and second terminals among said plurality of terminals at the key distribution center;
obtaining and sharing the session key generated by the key distribution center at the first and second terminals at a timing of a request for establishing a cipher communication session between the first and second terminals during a connection establishing procedure; and
carrying out the cipher communication between the first and second terminals by establishing the cipher communication session between the first and second terminals by completing the connection establishing procedure and using the session key obtained at the obtaining step.
1 Assignment
0 Petitions
Accused Products
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.
121 Citations
16 Claims
-
1. A method of cipher communication, comprising the steps of:
-
connecting a plurality of terminals with a key distribution center through a network;
generating a session key to be used in a cipher communication between first and second terminals among said plurality of terminals at the key distribution center;obtaining and sharing the session key generated by the key distribution center at the first and second terminals at a timing of a request for establishing a cipher communication session between the first and second terminals during a connection establishing procedure; and carrying out the cipher communication between the first and second terminals by establishing the cipher communication session between the first and second terminals by completing the connection establishing procedure and using the session key obtained at the obtaining step. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A cipher communication system, comprising:
-
a plurality of terminals including fist and second terminals for carrying out a cipher communication by establishing a cipher communication session between the first and second terminals; and a key distribution center, connected with said plurality of terminals through a network, for generating a session key to be used in the cipher communication between first and second terminals; wherein each terminal includes detecting means for detecting a request for establishing the cipher communication session between the first and second terminals such that the session key generated by the key distribution center is obtained and shared by the first and second terminals at a timing of the request for establishing the cipher communication session between the first and second terminals detected by the detecting means during a connection establishing procedure for establishing the cipher communication session. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
-
Specification