Design And Implementation Of A Trusted Video Surveillance System Based On Hi3521A Platform

In the network stage with the leading of big data and intelligence,the video surveillance system is becoming connected and numerical.It provides people with timely and intuitive information and plays an irreplaceable role in urban security,traffic management and building security.At the same time,the video surveillance system is also facing a series of security issues.Frequent incidents such as counterfeiting,forgery,and tampering of video surveillance data pose a serious threat to the reliability of video surveillance data.Especially in the process of judicial evidence collection,the reliability of video surveillance data as electronic evidence is crucial.Therefore,it is necessary to design corresponding security protection mechanisms for the characteristics and security threats of such video surveillance system to ensure the safe and reliable operation of the video surveillance system.To design a trusted video surveillance system,it is necessary to focus on the reliability of the audio and video multimedia datas recorded by the surveillance equipment and the reliability of the audio and video multimedia datas transmitted by the surveillance system in real time.The research work of this article includes:(1)A multimedia data tampering detection scheme is designed,which uses metadata blocks to perform tamper detection on grouped multimedia data files,and uses metadata block hash chains and block timestamps to perform multiple verifications on metadata blocks.Ensure the reliability of multimedia data files;at the same time,only digitally sign metadata block headers to reduce computational overhead,which is conducive to the real-time implementation of embedded systems.(2)A video streaming media data tampering detection scheme is designed.According to the characteristics of the encoded video frame,only digital signature and tampering detection are performed on the video I frame to ensure the reliability of the video streaming media data;at the same time,the digital data of the sender is reduced.The computational overhead required for the signature has a lower delay.For multicast application scenarios,the metadata frame structure is designed to transmit digital signature and time stamp information,which is compatible with existing streaming media clients that support RTSP protocol and H.264 format.The solution is simple to implement and has low computational overhead,which is conducive to the real-time implementation of embedded systems.(3)Based on the Hi3521A media processing platform,the collection,processing and encoding of video images are realized,and an embedded streaming media server is realized.The remote access and playback of real-time video streams can be realized through the streaming media client.Finally,the functional test and performance evaluation of the security scheme proposed in this thesis are carried out.