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1981年8月-9月,在美国帕罗阿多,华盛顿和瑞士苏黎士分别举办了“保密数字通信原理”技术讲座(见本刊第8期),这三次为期五天的讲座,主要是介绍与商用和军用卫星通信以及商用密码有关的保密通信基本原理。详细内容包括:相干与非相干调制、分组码和卷积码、扩频技术以及各种解调与解码技术。在对扩频系统的单一分析中包括瑞利衰落信道。此外,还介绍了代数编码、反馈移位寄存器和新颖的“公开密钥”密码系统。本讲座由瑞士联邦理工学院数字技术教授J.L.Massey博士和美国加州大学工
August 1981-September, Palo Alto in the United States, Washington and Zurich, Switzerland, held a “secret digital communication principle” technical seminar (see issue 8), the three five-day lecture, mainly introduced Fundamental principles of secure communications related to commercial and military satellite communications and commercial passwords. Details include: coherent and non-coherent modulation, block and convolutional code, spread spectrum technology and a variety of demodulation and decoding technology. Rayleigh fading channels are included in a single analysis of the spread spectrum system. In addition, algebraic codes, feedback shift registers and novel “public key” cryptography are introduced. This lecture was delivered by Dr. J. L. Masse, a professor of digital technology at the Swiss Federal Institute of Technology and a graduate of the University of California