Communication device, pre-shared key update method and pre-shared key update program

摘要

PROBLEM TO BE SOLVED: To perform operation without being restricted by a network configuration, and to update a pre-shared key used for encrypted communication with a simple operation. SOLUTION: When a flash memory 43 is connected to a USB port 33 of an embedded control device 3 in which a mode switching key 41 is inserted into a keyhole 39 of a key cylinder 37 and rotated to set a shared key generation mode, a new pre-shared key is used. Is generated. Then, the new pre-shared key is stored in the flash memory 43, and the pre-shared key of the data storage unit 307 is updated to the new pre-shared key. Further, when the flash memory 43 in which the new pre-shared key is stored is connected to the USB port 33 of the embedded control device 3 which is set to the encrypted communication mode by the rotation operation of the key cylinder 37, the pre-shared key of the data storage unit 307 is released. It is updated with the new pre-shared key read from the flash memory 43. [Selection diagram] Fig. 2