To prevent occurrence of a situation where each device cannot start communication with each other when there is a difference in the expiration time of the effective period for a common key used by each device in authentication among devices.
A device authentication management system obtaining a predetermined secret information from a authentication management means manages the secret information, and conducts authentication for communication with other devices using the secret information. The authentication management means comprises a generation means for generating the secret information having a first authentication information for communication between the authentication management means and the device, and a second authentication information for communication between the device and other devices, a first authentication means for conducting authentication for communication with the device using the first authentication information generated by the generation means, and a first transmission means for transmitting the second authentication information, based on authentication by the first authentication means.
NAKAKITA HIDEAKI
HASHIMOTO MIKIO
