| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmitter, a receiver, a communication system, and a communication method which enhance security of communication information. SOLUTION: A communication device 100 and a communication device 200 transmit and receive enciphered data through transmission lines 300A and 300B. Transmission data D2 is enciphered by using a secret key K1. When the transmission line 300A is used for transmission of transmission data D1, a transmission line other than the transmission line 300A< namely, the transmission line 300B is used for delivery of the secret key K1. For example, LAN cable is used as the transmission line 300A, and a power line is used as the transmission line 300B. COPYRIGHT: (C)2005,JPO&NCIPI
|
