Research On Technique Of Capture And Reconstruction Audio And Video Traffic

In recent years, the dissemination of information on the network is graduallyreplacing the traditional media, the amount of multimedia messages such as audiosand videos on the internet is growing rapidly, meanwhile, issues of informationsecurity caused by the network audio and video are also increasingly prominent. Thatthe reactionary audios, videos, speeches, rumors and pornographic informations,which are disseminated widely on the network by lawless persons, seriously endangerphysical and mental health of people, and even disrupt the normal social order, andseriously endanger national interests and security. All these have brought challengesto management work of information security on the network. Strengthening thesupervision to audio and video information on the networks has become an importantand urgent task of current network information security management. Restoration ofthe network protocol is the core task of practicing supervision to network.In view of the polularization of the large flow network and the extensiveapplication of muti-core processor, this paper designs and implements a effectiveaudio and video transmission protocol reconstructiong platform, which is completelyimplemented in user level. The platform captures the audio and video packets on thenetwork to restructure mainly on the bypass monitoring mode. It can restore the audioand video data packets to original files and store according to the need.This paper introduces some key technolgies of network protocols restore such aspacket capture, packet reassembly, application layer protocol reduction, and datastorage. In order to deal with the audio and video streaming on the Internet moreeffectively, The paper also analyses the audio and video transmission protocols, andstudy the theories and methods of flow identification. This paper have realized thereduction of HTTP、FTP and RTSP/RTP protocol.Finally, the result of experiment shows that the platform can efficiently,correctly restore audio and video data packets on the network to the application layer,and can add a variety of application layer protocols restore module as needed.The platform provides an interface for analysis of audio and video on thenetworks, and facilitate the monitoring and management of audio and video traffic onthe network.