Data security method of storage media

摘要

The present invention provides a data security device and a data security method of storage media. The data security device comprises an interface decoder for receiving control instructions and data from a host computer. The interface decoder is connected to an encryption/decryption unit and a password check unit. When a user wants to access the security data region in the storage medium, the password check unit will check the inputted password. If the password is correct, the encryption/decryption unit is activated to encrypt the data to be secured into a ciphertext and decrypt the ciphertext into a plaintext. A storage data access control unit connected to the encryption/decryption unit and the storage medium is also provided to store the ciphertext and plaintext from the encryption/decryption unit into the storage medium and read the data in the storage medium into the decryption/decryption unit. The present invention encrypts the data to be secured in the storage medium to have the advantage of absolute security.