MANET的灵活组网方式使其在很多重要领域具有广泛应用前景。尽管有关MANET的研究已经很多，其安全容量理论仍然是一个开放性问题, 很大程度的阻碍了MANET的发展及其商业化进程。本项目的目标是基于物理层安全的MANET安全容量研究。针对MANET缺乏安全容量理论的问题，研究MANET精确单播及多播安全容量，为MANET的网络安全设计提供理论指导；基于精确安全容量分析的框架，建立中断概率模型，分析安全容量、时延以及中断之间的折衷关系，并设计新型中继机制以灵活调控这三者之间的关系；为了提高MANET安全容量，结合协作干扰，编码和路由进行联合安全传输设计，在额定总功率的约束限制下，优化MANET安全容量。本项目预期建立一套完整的MANET安全容量理论，为MANET的网络安全设计和优化提供理论和方法的支撑，有力地促进现代网络信息论的发展及未来无线安全通信网络的广泛应用。

Due to their flexible networking technologies, MANETs find a lot of appealing applications in many important areas. Although a lot of research activities have been devoted to the study of MANETs, the fundamental MANET secrecy capacity (SC) theory is still largely unknown by now, which significantly hindered the development and commercialization of these networks. The goal of this project is to develop a complete MANET SC theory based on the physical layer (PHY) security technologies. Since there still lacks a complete theory for MANET SC theory, we will study the exact MANET SC for unicast and multicast, such that a general theory can be provided for the design of secure MANET. Based on the theory for exact MANET SC, we will develop the outage probability model and explore the tradeoffs among SC, delay and outage, and further develop a new relay scheme for the flexible control of such tradeoffs. For MANET SC enhancement, the joint design of the cooperative jamming, coding and routing will be explored to achieve the optimal MANET SC under the constraint of total power consumption. It envisioned that the complete MANET SC theory to be developed in this project will lay the foundation for the design and optimization of secure MANETs, and thus significantly facilitate the development of modern Network Information Theory and the applications of future secure wireless networks.