Implement Technology Of Preventing Compromising Emanations From DVI Video Signal Based On FPGA

This article first analyzes the research background of electromagnetic information leakage from computer systems,domestic and international research on this issue, and point out the need for researching information leakage form the new type of computer video interface DVI.The basic principle of DVI and it's electromagnetic leakage and interception mechanism is analyzed. This paper analyzes technology of preventing compromising emanations from DVI video signal, point out that the existing research results need to improve. Pseudo-random sequence is the key point of randomizing technology.Run-length distribution and 0-1 balance statistical analysis shows that the feedback shift register sequence is better than other sequence methods .Then, the autocorrelation function of linear feedback shift register and non-linear feedback shift registerer is compared. Taking into account that the randomizing technology needed to have the characteristics of white noise signal, ultimately chose the method of linear feedback shift register. Programming and simulation in the Xilinx ISE9.1 in accordance with the randomizing algorithm requirements ,and constitute the FPGA-based DVI preventing compromising emanation card's Firmware.