Research And Implemetation Of Smart IPTV Content Security Scheme On National Commerical Cryptograph Algorithm

In recent years,with the development of information,network technology and the promotion of"triple play"policy in China,function single and simple structure of old IPTV has become a smart system which assembles audio and video entertainment,convenience services,online education and application of shopping malls and other features nowadays.However,because it is equipped with openness of the android operating system and complexity of cyberspace,let IPTV content business data have security risks in the transmission and reception process,it affects health and sustainable development of the entire IPTV industry.Therefore,it has important practical significance for researching IPTV content security.This thesis is based on"the R&D and industrialize project of advanced household secure intelligent terminals in Fused Mode"project in Chengdu 30 KaiTian Corporation which is a subsidiary company of the 30^th Research Institute in China Electronics Technology Group Corporation.By analyzing current security problems and existing security technology in IPTV system,combining with the actual needs of the project,for improving system security and responding to national policies,saving cost of system technical support operation and management,improving the flexibility of the security control strategy and so on,this thesis presents a security scheme which was based on National Commerical Cryptograph Algorithm and IBC technology.At the same time,according to the characteristics of live and on-demand content services in IPTV,without affecting user's viewing effect.The methods for encrypting live streaming and encrypting on-demand content data is given respectively.In the above sheme,for avoiding the system core encryption technology controlled by others,this thesis introduce National Commerical Cryptograph Algorithm to realize the localization of the core encryption algorithm.Meanwhile,after the research,comparison and analysis of IBC technology,PKI technology and traditional IPTV content security solution,this thesis presents a scheme which is used IBC technology to replace PKI technology,PKI is used for key management,digital signature and identity authentication in old IPTV system,IBC technology core encryption algorithm is sm9 in this scheme.In addition,based on analysing of the characteristics of audio and video encryption algorithm and the content service data in IPTV,in order to reduce the amount of encrypted data,this thesis presents an encryption method of live stream which based on selecting encryption,it only select the encrypted audio and video data in audio and video stream.In terms of encrypted on-demand content,this thesis presents an on-demand video and audio encryption method,the entropy coding encryption algorithm is used to encrypt the on-demand video data in this method,in order to reduce the impact on sound quality,encryption of the audio data is realized by encrypting the encoded audio data which is located in the payload portion of the ADTS frame.Finally,the content security scenario is tested in a simulated environment,test results show that the security scheme which has given in this thesis improve performance of IPTV system.The scheme has functions of user authentication,user authorization and video and audio data encryption/decryption,the test results of the program which meet the requirements of the project in all aspects.At present,project group is debugging and optimizing the program,meanwhile,the program will be planed to used in intelligent set-top box of BesTV.