US 9,069,978 B2 · Data storage device and data protection method

Abstract

A flash memory includes a plurality of blocks. A controller encrypts a first file to produce a first encrypted file and stores the first encrypted file to the flash memory, wherein the controller further comprises a key generation module, an encryption/decryption module and a key eliminating module. The key generation module produces a first key according to a first write command of a host device, wherein the first key is stored in a first block of the blocks. The encryption/decryption module encrypts the first file according to the first key to produce a first encrypted file, wherein the first encrypted file is stored in at least one second block of the blocks. The key eliminating module deletes the first key stored in the first block according to a first eliminating command in order to invalidate the first encrypted file stored in the second block.

Claims17

Dependent claims

A data storage device, comprising:

a flash memory, comprising a plurality of blocks;
and
a memory controller, encrypting a first file to produce a first encrypted file and store the first encrypted file to the flash memory, wherein the controller further comprises:
a key generation module, producing a first key according to a first write command of a host device, wherein the first key is arranged to be stored in a first block of the blocks;
an encryption/decryption module, encrypting the first file according to the first key to produce a first encrypted file, wherein the first encrypted file is arranged to be stored in at least one second block of the blocks;
and
a key eliminating module, deleting the first key stored in the first block according to a first eliminating command in order to invalidate the first encrypted file stored in the second block, wherein the number of the at least one second block is determined by the first write command and a predetermined length.

4 more elements

Dependencies are inferred from the claim text.

Data storage device and data protection method

Life of this patent

Data storage device and data protection method

Life of this patent

Abstract

Claims17