| With the promotion and popularization of high-definition digital TV,the theft and infringement of digital content in the digital TV network has become more and more serious,and many piracy acts are implemented by recording or copying the digital content decrypted by the terminal interface.These illegal acts have caused huge economic losses to copyright owners.Therefore,it has become the focus of many scholars at home and abroad to perform reliable identity authentication on content terminals to securely transmit digital content between interfaces.The identity authentication mechanism of the currently widely used digital interface content protection system is based on Public Key Infrastructure(PKI),but the traditional PKI system has some drawbacks,such as the high degree of centralization of certificate issuing agencies,the easy occurrence of single point of failure,the revocation mechanism is incomplete,etc.With the continuous development of blockchain network technology,its features of decentralization,non-tampering,and traceability have brought new thinking directions to solve the problems existing in traditional PKI systems.At present,the key technology of the blockchain-based PKI system is to store the certificate on the public blockchain and conduct certificate query management.However,this method still has the problems of high transparency of content terminal identity information,low reliability of nodes on the blockchain,and low authentication efficiency.In view of the above problems,this thesis proposes a digital interface content protection system identity authentication mechanism based on the Fabric consortium blockchain.The main research contents are as follows:(1)Firstly,the cryptography technology of digital interface content protection system,the existing digital interface content protection system and related concepts of blockchain technology are introduced.It expounds the identity authentication protocol of a typical highbandwidth digital content protection system in detail,and focuses on the specific process of executing transactions in the Hyperledger Fabric consortium blockchain.(2)Aiming at the problems that the traditional PKI system certification center has too large rights,the validity period of the content terminal certificate is fixed,and the certificate revocation list occupies a large amount of memory and is not time-sensitive,a digital interface content protection PKI system based on the Fabric consortium blockchain is proposed.For this system,this thesis designs the digital certificate and block structure under this model.Then,the life cycle management process under this system is elaborated,including the specific implementation steps of content terminal certificate chaining,chain certificate update,and chain certificate revocation,and it is explained that it improves the efficiency of certificate revocation and makes the certificate use period more flexible..Finally,the security analysis is carried out,which proves that the certificate management authority of the PKI system is not easy to attack,and at the same time,it ensures the privacy of the key identity information of the content,and makes the certificate revocation have realtime and security.(3)Aiming at the problems of certificate information leakage and low authentication process efficiency caused by the need to exchange certificates in the identity authentication mechanism of the traditional digital interface content protection system,an identity authentication mechanism of the digital interface content protection system based on the Fabric consortium blockchain is proposed.This mechanism uses some accounting nodes as query servers to receive requests from content terminals and verify the validity of the certificate by viewing the world state.After the verification is passed,the transaction information that has passed the identity authentication is recorded by multiple nodes in the consortium blockchain.In the ledger,the system is used to query the circulation path of digital content.Finally,the security analysis is carried out,which proves that this mechanism has a strong ability to resist attacks.(4)Finally,the system model simulation is carried out.This thesis uses the Java programming language to build a Fabric system simulation platform based on the SpringBoot framework,and uses the Docker virtualization technology to implement the certificate life cycle management scheme proposed in Chapter 3,which lays the foundation for building a digital interface content protection system based on the consortium blockchain. |
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