Abstract: A nonvolatile memory system is disclosed. The nonvolatile memory system includes a host device and a storage device connected to the host device through a physical cable including a power line and a data line. The storage device includes: a nonvolatile memory; a link controller configured to temporarily deactivate the data line while supplying power from the host device through the power line; and a memory controller including a user verification circuit configured to authenticate a user of the storage device and change a state of the memory controller according to a verification result, a relink trigger circuit configured to control the link controller based on the state change of the memory controller, and a data processing circuit configured to encrypt and decrypt data.

Abstract: A method for managing a replay protection memory block (RPMB) of a storage device includes allocating an RPMB master region managed separately from an RPMB region in which an RPMB key is stored in the RPMB of the storage device, programming a master key into the RPMB master region responsive to a request from a host, receiving a reset request for the RPMB region using the master key from the host, resetting the RPMB key in response to the reset request for the RPMB region, and receiving a reset lock request for the RPMB region from the host.

Abstract: A storage device includes a nonvolatile memory device, and a controller that manages a data encryption key (DEK). The DEK is used to encrypt data to be written in a storage space of the nonvolatile memory device by a first user and to decrypt data read from the storage space. The controller grants a second user authority to access the storage space by encrypting the DEK based on a Diffie-Hellman (DH) algorithm, grants a second user authority to access the encrypted DEK, and decrypts the encrypted DEK based on the DH algorithm.

Abstract: A storage device includes a nonvolatile memory device, and a controller that manages a data encryption key (DEK). The DEK is used to encrypt data to be written in a storage space of the nonvolatile memory device by a first user and to decrypt data read from the storage space. The controller grants a second user authority to access the storage space by encrypting the DEK based on a Diffie-Hellman (DH) algorithm, grants a second user authority to access the encrypted DEK, and decrypts the encrypted DEK based on the DH algorithm.