Patent ID: 11972119
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. The storage system according to claim 2,
wherein the format management information stored in the memory includes information that associates an address range indicating a predetermined storage area provided in the storage device with the format of the cryptographic operation corresponding to the storage device,
when a request issued by the host terminal is a request for writing data in the storage area of a storage device address in the storage device, the processor is configured to generate circuit instruction information that includes: a request type indicating the request for writing; identification information on the encryption key corresponding to the storage device address; first memory address indicating the storage area of the memory that stores the data; a second memory address of the memory for designating storage area that stores encrypted data obtained by encrypting the data; and a format of the cryptographic operation corresponding to the storage device,
upon receipt of the circuit instruction information, the cryptographic operation circuit is configured to:
read, from the memory, the data stored in the storage area at the first memory address;
read the encryption key associated with the identification information, from the stored key information; and
store the encrypted data obtained by encrypting the data using the encryption key according to the format, in the storage area at the second memory address,

the processor is configured to generate storage device instruction information that includes information on the request type indicating the request for writing, on the storage device address, and on the second memory address, and
upon receipt of the storage device instruction information, the storage device stores the encrypted data stored in the storage area at the second memory address, in the memory area at the storage device address.