Based On Linux System Network Encryption Card Design

In recent years, with the rapid development of the Internet, e-commerce, mobile payments, Internet banking, online banking, O2 O platform has been integrated into the lives of each of us. Search engines, multimedia information transmission network, social networking is closely related with us early. People become accustomed and depend on the computer to obtain a variety of information or edit information to transmit through the network. The Internet's openness and anonymity makes the information from the network become very insecurity, which makes the growing problem of network security. Therefore, network security products have tremendous potential and significance of the research.This paper is designed based on a Linux system, based on FPGA's "network data encryption card" scheme. Hardware based on FPGA in VHDL language development environment to achieve the NIC chip DM9000. Software driver is implemented based on the open source Linux system. The design main achieve the function is that in the process of data transmission it can select if the data should be encrypted through "network data encryption card ", and then transmit plaintext or ciphertext through the Internet. The receiving process can decrypt the ciphertext. The ZUC algorithm is achieved in FPGA card. The system based on encryption of hardware, and achieve safe transmission through network to ensure the reliability of data transmission and network security.The first part of this paper study the overall hardware requirements analysis and modular hardware framework. It describes the PCI interface based on PCI protocols implementation and principle of PCI protocols and operation of the DM9000 chip. It introduces principle of DM9000 operation control module within the FPGA chip, the connection method of DM9000 card, ZUC sequence encryption algorithm.The part of software mainly research Linux system driver that based on PCI interface card. Framework of network device driver based on PCI interface and work process is explained. It detailedly introduce processing mechanisms of data and principle of transmission and reception in network.The design has been verified and experimented through more than one computer on the Internet, which achieves a secure and reliable transmission of ciphertext.