CAREER: Secure Communication via Source and Channel Randomness

抽象为？职业：通过源和通道随机性进行安全通信？目前密码系统的设计主要依赖于两类算法：私钥算法和公钥算法。密钥算法简单高效，但存在密钥管理困难。公钥算法在密钥管理方面简单，但计算量大，容易受到中间人攻击。本研究调查了新兴的物理层安全方法，这些方法要么在没有密钥的情况下实现安全通信，要么通过使用强大的编码技术生成密钥来简化密钥管理。本研究旨在推动物理层安全方法在实际无线通信系统中的应用，促进数学、计算机科学和电子工程等多学科研究人员的合作，为解决无密钥安全通信和密钥协商问题提供一个综合框架（密钥生成和分发）用于各种通信环境，包括非相干通信、具有复合状态的信道、衰落信道、噪声窃听和多跳网络。具体而言，本文研究了信道不确定性和时延约束下的鲁棒安全通信，不同终端对多密钥协商的基本折衷，联合利用信源和信道随机性的密钥协商算法，以及利用网络编码的多跳网络密钥协商协议。该计划与夏威夷大学的教育和课程开发密切相关，并涉及物理层安全主题的高级专着的开发，以帮助传播通信社会内外这一活跃领域的进展。

Abstract for?CAREER: Secure Communication via Source and Channel Randomness?Current cryptosystem design depends on two main kinds of algorithms: secret-key and public-key algorithms. Secret-key algorithms are simple and efficient but have key management difficulty. Public-key algorithms are simple in key management but are computationally costly and vulnerable to the man-in-the-middle attack. This research investigates the emerging physical layer security approaches, which either achieve secure communication without keys, or simplify key management by generating keys using powerful coding techniques. This research aims at facilitating implementation of the physical layer security approaches to practical wireless communication systems, and stimulating interdisciplinary collaborations among researchers in mathematics, computer science and electrical engineering.This research provides a comprehensive framework to solve the problems of keyless secure communication and key agreement (key generation and distribution) for a variety of communication environments including noncoherent communication, channels with compound states, fading channels, noisy eavesdropping, and multihop networks. To be specific, this research investigates robust secure communication under channel uncertainty and delay constraint, fundamental tradeoff in multi-key agreement for different terminal pairs, key agreement algorithms by jointly using source and channel randomness, and key agreement protocols in multihop networks by exploiting network coding. This program is strongly coupled with educational and curriculum development at the University of Hawaii, and involves development of an advanced monograph on the topic of physical layer security to help disseminate the progresses in this active area in and outside the communication society.