The Research Of Content Protection Technology For Digital TV Terminal Interface Based On RSA

In ensuring the safety of content delivery, at present, the majority of operators use CA or DRM technology to achieve this object. But, according to International Intellectual Property Alliance (IIPA)'s data of 2006, more than 90 percent's pirated achieve this through copying or recording by the terminal interface. So, the protection of users'terminal digital-interface is an urgent problem. This subject is mainly directed against terminal interface's features of DTV and proposes a content protection scheme which is unlike HDCP.Firstly, through analyzing the content protection of HDCP and the used protocols for validation, based on the current CA (Certificate Authority) system, we advances a certificating scheme for two main modules: transmitter and receiver, and realize making, distributing and revocating of certificate.We study the algorithm about the generation of large primes, modular power and mode inverse operation and mainly analyze the security, keys'space and scalability. The paper also discusses the complexity of encryption and decryption operation.Based on the principle of RSA encryption an decryption algorithm, proposing an algorithm which can parse devices'certificate belonging to a group simultaneity, and generates GPK(Group Key).But single-user device only need their private key to resolve the key which is embedded into the media data.In order to ensure the security of video data, designing a random number generator which can produce a random data of SK (Session Key) used to scramble the video data. Using GPK to encrypt SK and getting SK', SK'is sent to the client through secure session link.The results show that the proposed scheme is real-time and safe. The process of verifying is simple and efficient. The programme ensures that illegal can't descramble video, but legal devices can broadcast real-time video.