以移动互联网、社交网络、云计算、大数据等为代表的新兴互联网技术的飞速发展对我国网络空间的安全提出挑战。我国在《国家中长期科技发展规划纲要（2006-2020）》中明确提出要重点研究新型密码技术。国家自然科学基金委“十二五”（2011-2015）发展规划将“高维系统全局分叉和混沌”列为优先发展的研究方向。本项目拟通过计算机科学、混沌理论、信息安全、数学与系统科学多学科交叉，突破混沌密码分析与设计和多媒体混沌保密通信的若干瓶颈问题，在混沌密码分析与设计及其在多媒体保密通信中的应用方向上取得具有国际影响的成果。具体而言，项目组将提出一套数字混沌密码分析与设计的新方法、揭示数字域中混沌动力学退化的本质演化规律、设计高维混沌密码系统、发展一套多媒体实时远程混沌保密通信的安全算法。此外，本项目将创建一个混沌保密通信的示范验证系统。本项目的研究成果将为我国网络空间的安全提供新的技术支撑。

With the rapid development of new network technologies, such as mobile networks, social networks, cloud computing and big data, the national cyber-security is encountering all kinds of threats. To address this challenge, the subject of developing novel ciphers was selected as a key strategy in the Outlines of Medium- and Long-term Planning for China Scientific and Technological Development (2006-2020). Meanwhile, global bifurcation and chaos of higher-dimensional systems is a focal research area identified by the 12th Five-Year Plan (2011-2015) of NSFC. From the interdisciplinary approach combining computer science, chaos theory, information security, mathematics and systems science, this project aims to solve some fundamental problems in the field of chaos-based security analysis and algorithms design for secure multimedia communications. The objective is to develop a series of high-impact outcomes on cryptanalysis and chaotic ciphers design, with its applications to secure multimedia communications. Specifically, this project plans to establish a set of new methods for designing and analyzing digital ciphers, disclose essential evolution rules of dynamical degradation of chaotic systems in the digital domain, design chaotic ciphers based on higher-dimensional chaotic systems, and develop an efficient secure encryption scheme for remote real-time chaotic multimedia communications. In addition, a demonstration platform on chaotic secure communications will be built to verify its effectiveness. The expected results of this project will provide novel technological support for securing our national cyber-space communication framework.