Patent ID: 9720848
Date: 2017-08-01
CPC Classifications: G06F,H04L

Claim:
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.