云媒体社交网络下的数字媒体内容安全与版权保护

The emerging cloud media social networks have significantly spurred the misuse and malicious dissemination of digital media contents (rights) among users. However, the theories and methods for security, trustworthiness, controllability of digital media rights management systems available do not meet the requirements of the novel Internet application, which is an urgent problem to solve. The project centers on three essential factors that affect on the implementation of digital media copyrights protection, that is media content access control, media terminal trusted admission and media rights secure distribution, as well as explores the key technologies of DRM, from three layers of cloud media services, media networks admission and user social networks, respectively. The project emphasizes the following research works, such as the cryptographic-based media contents secure access control mechanisms, the trusted admission secure protocols for mobile terminals accessing to marginal cloud media, the finding of media rights potential paths and its security risk assessment. The research has important significances on application theory of foundations in realizing the cloud media contents security and copyrights protection, in combination with the media rights legal sharing and controllable dissemination, while it has great application prospects and values on digital media platform establishment as well as healthy and benign industry progress.

新兴的云媒体社交网络进一步加剧了数字媒体内容（权利）的滥用和恶意传播，而现有数字媒体版权保护系统的安全、可信、可控理论和方法，又无法满足这一新兴互联网应用的需要，亟待解决。本项目紧密围绕影响数字媒体版权保护的三要素，即媒体内容访问控制、媒体终端可信接入和媒体权利安全传播，分别从云媒体服务层、媒体网络接入层和用户社交网络层，探索新兴互联网应用下的数字版权管理关键技术。重点研究基于密码方法的云媒体内容安全访问控制机制、边缘云媒体移动终端可信接入安全协议，以及媒体权利潜在传播路径发现及其安全风险评估等。本研究对实现云媒体内容安全与版权保护，以及媒体权利的合理分享和可控传播，具有重要基础理论意义，对促进数字媒体内容平台和产业健康、良性发展，具有良好的应用前景和实用价值。

新兴社交媒体网络正呈现出综合化、多样化和智慧化等显著优势，然而它的媒体内容安全和版权保护问题却日趋严重，亟待解决。现有研究工作主要针对媒体内容和用户安全，包括模型、机制、协议和算法等，但仍缺乏从媒体内容、数字终端和数字权利的全面视角，系统研究云媒体社交网络，从而严重地影响到新兴社交媒体的实际应用。本项目提出了基于信任理论的数字媒体跨域、跨群组访问控制模型，提出了面向多媒体社交网络委托授权理论模型，以及基于属性的访问控制理论模型及应用。描述了基于代理重加密的媒体访问控制和委托（转）授权方案，提出了适合移动终端的远程证明和可信接入认证方法，以及在线社交网络中的热点信息传播机制和风险评估方法，最终构建并部署了多媒体社交网络平台原型系统。通过现实社交平台实验验证和分析，验证了上述理论和方法的安全性、有效性和效率。本研究对不断增强平台安全和可信，构建安全持久、可信赖的社交媒体生态系统，具有重要应用基础理论意义；对实现社交媒体内容的安全交互、分享和数字版权保护，促进数字媒体内容产业的健康、良性和快速发展，也具有较好的应用前景和实用价值。

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