Research On Computer Information Anti-leakage Technology Of New-type Display Interfaces

Along with the progress of computer visual display technology, the traditional displayinterfaces can not meet the transmission needs of high-definition video content. Basing on this,the industry has proposed several new display interfaces. The substantial increase in the signaltransmission rate has put forward new requirements for information security.This article firstly introduced the background and current situation of research in thefield of information anti-leakage technology, and some of the existing digital processingtechniques for DVI display interface. The source analysis of computer information leakagethat may exist in display devices using a new-type display interface, combined with thecomparison of video signal flow and transmission structure with that using DVI, gaveapplication feasibility of some anti-leakage processing techniques such as spread-spectrum forthe signal on internal LVDS interface.After the information leakage analysis of the internal interface, this article then wentalong a detailed study of video signal transmission using the two new display interfaces ofHDMI and DisplayPort, including the transmission structure, the video data encoding, theleaking characteristics of a particular signal, as well as content protection protocol and devicestandards. Through the study we identified that the decoded TTL digital signal was the maininformation leaking source of new-type display interfaces. And the processing of signal in thisform could effectively guarantee the security of information transmitted.In the end, this article proposed a scheme of anti-leakage techniques based on new-typedisplay interfaces, and then improved several data processing algorithms our group broughtforward for DVI to suit the new interfaces. The color randomizing algorithm is an effectivesolution for computer video information anti-leakage technology of new-type displayinterfaces.