| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability in security without losing the convenience of radio communication when transmitting or receiving data between a plurality of electronic equipment by radio communication. SOLUTION: In a communication system 1, data are transmitted or received via a radio communication link A conforming to the Bluetooth standard and an infrared communication link B between communication devices 2 and 3. The communication device 2 transmits original encryption information retained in a memory 22 to the communication device 3 via the infrared communication link B, and the communication device 3 retains the transmitted original encryption information in a memory 32. Then, when information is to be transmitted via the radio communication link A from the communication device 2 to the communication device 3, information that is encrypted based on the original encryption information in the memory 22 is transmitted. |
