Network relay device, communication device and network relay method
AssigneeKabushiki Kaisha Toshiba
InventorTakashi Kokubo
Life of this patent
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Abstract
In accordance with the present invention, a network relay device includes a first interface which is connected to a first network and sends contents information encrypted by key information, a second interface which is connected to a second network and sends the contents information to a receiving a network relay device, and a notification section which detects that the key information is changed and notifies a key change notification signal to the receiving network relay device.
Claims13
A network relay device which performs communication in order to relay from a first network to a second network comprising:
- a first interface which is connected to a first network and receives contents information encrypted by key information;
- a second interface which is connected to a second network which is different from the first network and sends the contents information;
- and
- a notification section which detects whether or not the changed via the first interface, and which, if the key information is changed, notifies a key change notification signal to the second network via the second interface.
A communication device comprising:
- a communication section which performs a communication processing for contents information encrypted by key information with a communication device on a network via an interface connected to the network and other network relay device connected to the other network;
- and
- a control section which, when the communication section receives a key change notification signal from the network relay device via the interface, sends a signal to obtain new key information to the communication device on the other network, decrypts the contents information on a basis of the new key information, and outputs the decrypted information.
A network relay method performed by a network relay device having a first interface which is connected to a first network and receives contents information encrypted with key information and a second interface which is connected to a second network which is different from the first network and sends the contents information to a network relay device to be relayed, the method comprising the steps of:
- inquiring whether or not the key information is changed via the first interface;
- and
- receiving an answer signal to the inquiry, and if the key information is changed, notifying a key change notification signal to the second network via the second interface.
Dependencies are inferred from the claim text.