Storage device and control method for storage device

1. A storage device which is communicatably connected to a management server managing key information, the storage device comprising: a memory device; and

a controller being configured to control the memory device, the controller being configured to implement encryption processing on data inputted and outputted to and from the memory device by using a piece of key information;

to determine whether the key information used by the controller is managed by the management server when stoppage of an operation is indicated, and

to stop the operation in a case where the key information is determined to be managed by the management server, and not to stop the operation in a case where the key information is determined not to be managed by the management server;

wherein, in the case where the key information is determined not to be managed by the management server, the controller transmits the key information to the management server to register only the Lev information which is not managed by the management server, of all pieces of key information, by transmitting to the management server all the pieces of kev information including the kev information determined not to be managed by the management server, and stops the operation after confirming that the management server has registered the kev information; and

wherein the controller selects a preset other management server in a case where the kev information cannot be transmitted to be registered in the management server, transmits all the pieces of kev information to the selected other management server to register, and stops the operation after confirming that the other management server has registered all the pieces of key information.

2. The storage device according to claim 1 , characterized in that in the case where the key information is determined not to be managed by the management server, the controller outputs a notification to that effect.

3. The storage device according to claim 2 , characterized in that in the case where the key information is determined not to be managed by the management server, the controller outputs a notification to confirm the key information registration in the management server.

4. The storage device according to claim 3 , characterized in that in a case where the key information registration in the management server is authorized, the controller transmits the key information to the management server to register the information in the management server.

5. The storage device according to claim 1 , characterized in that the controller holds key confirmation information indicating a time point at which the management server confirms the key information used by the controller, determines that the key information, in which a difference between a confirmation time point recorded in the key confirmation information and a current time point is within a prescribed time period, is managed by the management server, and stops the operation.

6. The storage device according to claim 1 , characterized in that the controller transmits information concerning the key information used by the controller to the management server such that in a case where a deletion of any of the key information managed by the management server is indicated to the management server, the management server does not delete the key information used by the controller.

7. A controlling method for a storage device communicatably connected to a management server managing key information,

the method comprising:

implementing encryption processing on data inputted and outputted to and from a memory device by using key information;

determining whether stoppage of an operation is indicated;

determining whether the key information used by the storage device is managed by the management server in a case where the stoppage of the operation is determined to be indicated; and

stopping the operation in a case where the key information is determined to be managed by the management server, and not stopping the operation in a case where the key information is determined not to be managed by the management server:

wherein, in the case where the key information is determined not to be managed by the management server, the controller transmits the key information to the management server to register only the key information which is not managed by the management server, of all pieces of key information, by transmitting to the management server all the pieces of key information including the key information determined not to be managed by the management server; and stops the operation after confirming that the management server has registered the key information; and

wherein the controller selects a preset other management server in a case where the key information cannot be transmitted to be registered in the management server, transmits all the pieces of key information to the selected other management server to register, and stops the operation after confirming that the other management server has registered all the pieces of key information.

8. The controlling method for a storage device according to claim 7 , characterized in that the operation is not stopped in the case where the key information is determined not to be managed by the management server, and a notification stating that the key information is not managed by the management server is outputted.

9. The controlling method for a storage device according to claim 8 , characterized in that the notification also includes a notification to confirm whether the key information is registered in the management server.

10. The controlling method for a storage device according to claim 7 , characterized in that the key information is transmitted to the management server to be registered in the management server in the case where the key information is determined not to be managed by the management server.