Hard Disk Encryption Card's System Design Based On Nios Embedded System

The combination of Computer and Communication has provided the opportunity that information society develops at full speed in the whole world. However, everyone should face austere situation of the information security, while we enjoy enormous benefit that the information system brings. Information security not only concerns the personal privacy, but also the national security and benefit. Hard disk, which is the irreplaceable information device to store data, has been widely used in many kinds of information products. Hard disk encryption card, which is based on FPGA and could encrypt the data transmitted on IDE data bus, is a physical layer device used to protect the data stored in hard disk.This paper particularly introduces a hardware/software co-design methodology which is based on Nios Embedded Processor; work principle, protocol, timing of IDE interface Hard Disk; and the principle of data encryption. And propose the design schemes as follow:1) System design scheme of hard disk encryption card which is based on Nios embedded system.2) IDE interface which could support Ultra DMA and PIO transfer mode.3) Encryption principle of hard disk encryption card and Key management scheme.