Airgap Mechanism And Achieve Study

Today, the information technology is developing at very fast speed, while promote effectively the development of human society. The information security have increasing effective to security and stabilization of a state with information technology developing.Our country is a developing country. There are serious security hidden trouble because depending on other county in both hardware and software. So establishing a reliable information security system based on own technology undoubtedly has a very important strategic meaning.The paper analyzes existing several kinds of network security technologies. Their advantages and disadvantages are compared, based on these analysis, a scheme of network security is proposed. Through switching over back and forth between internal and external network, this scheme isolates interior network from exterior network in physical link layer at same time, but logic link to each other.HTTP protocol is analyzed in detail, the realization principle and technology of the scheme are studied. It utilizes USB to connect internal network with external network, and users can accesses Internet through HTTP protocol. Then, linux programming is discussed, USB system and USB programming under linux are studied. Finally, a preliminary programming realization of the scheme is presented.