【作者】 王娟；

【导师】 吴俊军；

【作者基本信息】 华中科技大学 ， 管理科学与工程， 2006， 硕士

【摘要】 流媒体数字版权保护(DRM,Digital Rights Management)技术是对流媒体数字内容的知识产权进行保护的一系列软硬件技术。本文在对流媒体DRM研究现状进行综述的基础上,提出了一种新的流媒体DRM模型——时分变码流媒体DRM,解决了现有流媒体DRM实时性差、安全性不够完善、权利迁移比较困难的缺陷。首先,本文分析了各种加密算法的特点和流媒体数据传输的特点,提出了流媒体传输的实时加密方案——时分变码。分析了时分变码的两个关键问题——密钥变化的规律和密钥变化的时间间隔。研究了时分变码的实现原理,为设计时分变码流媒体DRM模型奠定了理论基础。其次,建立了时分变码流媒体DRM的功能模型,并分析了该功能模型与现有流媒体DRM功能模型的不同。建立了时分变码流媒体DRM的数据模型。在功能模型和数据模型的基础上,提出了时分变码流媒体DRM的系统构架。深入研究了系统构架中三个主要模块——用户认证授权模块、流媒体加密分发模块和流媒体安全播放模块的结构和实现流程。再次,分析了时分变码流媒体DRM的密钥体系。它是一个包含三种密钥——内容密钥、业务密钥和用户密钥的混合密钥体系。本文利用密钥管理的基本原理,研究了时分变码流媒体DRM中三种密钥的生成、分配、保存和更新。最后,将时分变码流媒体DRM应用到视频点播VOD(Video-On-Demand)系统中,设计了基于时分变码流媒体DRM的VOD系统的系统结构、业务流程,实现了该VOD系统中时分变码流媒体DRM的三个主要模块。证明了时分变码流媒体DRM具有很好的实时性、安全性和灵活性。更多还原

【Abstract】 Streaming media DRM (Digital Rights Management) protects intellectual property of streaming media with a series of hardware and software technologies. In the existing streaming media DRM systems, encrypting streaming media is not real-time, the security is not enough and rights migration is difficult. The thesis presents a new streaming media DRM model to solve these problems. The new model is called Key Random Variation DRM.Firstly, the thesis presents a new method, called Key Random Variation, to encrypting streaming media. Its two key questions, how to change the cipher and how long to keep cipher unchanged, are analyzed. Its realization is researched. All above are the theoretic base of Key Random Variation DRM.Secondly, Key Random Variation DRM is designed. Its functional model is established and the different functions to the existing streaming media DRM systems are discussed. Then its data model is founded. Based on the functional and data model, the framework of Key Random Variation DRM is designed. It has three main modules, authenticating module, encrypting and distributing module and safe playing module. The structure and working flow of each module are designed.Thirdly, the key system of Key Random Variation DRM is analyzed. It is a mixed key system including Content Key, Service Key and User Key. According to the basic theories of key management, how to generate, distribute, save and renew the three kinds of keys is discussed in the thesis.Finally, Key Random Variation DRM is realized in VOD (Video-On-Demand). The system structure and the operating flow of the VOD system are designed. The three main modules of Key Random Variation DRM in VOD are programmed. The application proves that Key Random Variation DRM is real-time, safe and flexible.更多还原