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本文对CONSUMER微电子公司专为话音保密通信设计的一种高性能话音保密芯片FX224进行了介绍,并给出了FX224的典型应用电路. 相似文献
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本文以世界通信的总体发展趋势为依托,结合中国通信事业的发展实际,介绍和分析了中国电话机的现状,趋向及相应的话音保密的市场需求。 相似文献
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“混沌”一词自古有之,但应用于保密通信还是近年来的事。自1990年美国海军实验室的Pecora和Carroll首次采用电子线路实现混沌同步技术以来,混沌保密通信已成为近年国际保密通信技术的研究热点,比目前广泛应用的m 序列保密通信更具发展前景。 1.m 序列保密通信的工作原理 m 序列是一种类噪声特性较好的伪随机序列。利用线性反馈移位寄存器,可产生输出序列具有周期长度为p 的数字序列。例如:下列m 序列的p =15(因为第15位数字后,又是周而复始的重复序列),000 1111 0101 1001,000 … 相似文献
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本文主要讨论了保密通信的概念、数据加密的方式、加密的算法及密钥管理方式,描述了一种利用CSD信道来实现GSM网络中的数字加密通信方式。 相似文献
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《通信业与经济市场》2005,(11):53-53
日前,全球知名的咨询公司In-Stat在北京举办了电信分析师交流会,来自In-Stat美国公司的KeithNissen和DavidChamberlain将全球最新的通信发展的热点和趋势与中国业界交流分享。 相似文献
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神经网络:通信及其保密通信领域的新技术 总被引:1,自引:0,他引:1
神经网络是近年来发展迅速的一门新型学科。它具有自适应学习、大规模并行分布处理、联想记忆以及强容错性等功能特点,是90年代最具希望和潜力的智能科学,各发达国家均不惜工本致力于该项研究,使神经网络的应用领域得到了长足发展,其中通信及其保密通信即是神经网络的重要应用领域,并已成为神经网络应用研究中的一个热点。本文在概述神经网络基本概念及其模型基础上,综述了神经网络在通信及其保密通信领域中的应用现状,并展 相似文献
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Hamsa A. Abdullah Hikmat N. Abdullah Waleed A. Mahmoud Al‐Jawher 《International Journal of Communication Systems》2020,33(4)
Recently, the synchronization between two matching chaotic systems to provide confident communication has gained a lot of interest. Continuously, there is a necessity to produce a novel dynamical system to be used in synchronization to implement a strong security system. In this paper, a hybrid chaotic system is suggested and verified for the potential use of secure communication through chaos synchronization. The Lyapunov exponent (LE) and zero‐one (0‐1) tests have been used to verify the performance of the suggested hybrid chaotic system, while National Institute of Standard and Technology (NIST) tests have been applied to verify the randomness properties. And the synchronization has been achieved between master and slave systems by using nonlinear control laws. The simulation outcomes demonstration that the hybrid system has chaotic performance and outstanding randomness characteristic. The statistical results gained for LE test was 0.8822, and for frequency test (FT) was 0.2028, while for the run test (RT) was 0.1924. Accordingly, the suggested hybrid system can be used to evolve functional synchronization algorithms and encryption for image, video, and voice secure communication applications. 相似文献
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Principles and applications of SQUIDs 总被引:3,自引:0,他引:3
Clarke J. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1989,77(8):1208-1223
An overview of the current status of DC and RF SQUIDs (superconducting quantum interference devices) is presented. Using Nb-based thin-film technology, a number of groups can now routinely fabricate DC SQUIDS with input circuits integrated on the same chip. At 4.2 K, the DC SQUID, which operates with a constant bias current, can detect signals with an equivalent energy per unit bandwidth of a few hundred h 2π. RF SQUIDs, which operate with an RF flux bias, are usually machined from bulk Nb, and have a typical energy sensitivity per unit bandwidth of 105 to 106h 2π. Both types of SQUID can be used in a wide variety of applications, including magnetometers, gradiometers, susceptometers, voltmeters, RF amplifiers, gravity-wave antennas, and gravity gradiometers. Both DC and RF SQUIDs have been fabricated from high-temperature superconductors and operated at temperatures of up to 77 K. These devices exhibit high levels of 1/f noise, which generally arises from the motion of trapped magnetic flux 相似文献
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发光材料因为其在国家能源战略和人们日常生活上的重要地位,越来越受到关注。发光材料的发光原理,发光特点,在应用上的优势,以及更好地利用这些优势较之于其他材料,发光材料更容易让人产生疑问。文中介绍几种不同的发光材料,分析它们的发光原理和发光特点,并结合实际生活探究其应用前景。 相似文献