Data storage devices using non-volatile memory devices and operating methods thereof

An operating method of a data storage device including a buffer memory, a non-volatile memory, and a controller, the operating method comprising:

• receiving, from a host, a decryption request for encrypted data stored in the buffer memory;
• performing a decryption operation in response to the decryption request,
• wherein the performing of the decryption operation comprises:
• receiving a physical address of a buffer region of the non-volatile memory;
• causing an encryption module included in the controller to be in an off state;
• programming the encrypted data in the buffer region of the non-volatile memory based on the physical address;
• causing the encryption module to be in an on state;
• generating decrypted data by reading and decrypting the encrypted data from the buffer region of the non-volatile memory;
• and
• storing the decrypted data in the buffer memory.

A data storage device comprising:

• a buffer memory;
• a non-volatile memory;
• and
• a controller configured to receive an encryption request for data stored in the buffer memory from a host and to control an encryption operation in response to the received encryption request,
• wherein, during the encryption operation,
• a physical address of a buffer region of the non-volatile memory is received, encrypted data is generated by causing an encryption module included in the controller to be in an on state to encrypt the data stored in the buffer memory, the encrypted data is programmed in the buffer region of the non-volatile memory based on the physical address, the encrypted data is read from the buffer region of the non-volatile memory by causing the encryption module to be in an off state, and the read encrypted data is stored in the buffer memory.