Enciphered protection and read write control method for computer data

This invention relates to a computer data cipher protection and a read/write control method, which applies a generate method combining a serial bus ciphering dog or software identity certification with the sector stage read/write interception to realize cipher to hard disk data, which utilizes the sector stage read/write interception method to intercept all read/write operations, carries out cipher/decipher conversion in the cipher core under the condition of existing related identity certification to realize the cipher to disk data and read/write control.