A device for enciphering and deciphering, by means of the DES algorithm, data to be written to or read from a hard disk

摘要

A device for enciphering and deciphering with the aid of the DES algorithm data to be written to or read from a hard disk, wherein the input of a DES cipher device (25) is coupled, via a converter (26) for converting data words having a word width of 16 bits to data words having a word width of 64 bits, to a bus for transferring data words having a word width of 16 bits to and from a central processor unit, and to a bus for transferring data words having a word width of 16 bits to and from a disk storage unit and wherein the output of the DES cipher device is coupled, via a multiplexer (27) for converting data words having a word width of 64 bits to data words having a word width of 16 bits, to the bus of the central processor unit and to the bus of the disk storage unit.