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当今通信的保护和保密问题越来越引起人们的重视。实际的需要以及计算机和(?)电子技术广泛应用,使密码学发生了革命性的变革。计算机越来越多地用来处理和存贮机密信息,这就要求对用户存贮和传输的程序或数据提供适当的保护以防止他人窃取和分析。计算机又是快速分析信息的有力设备,这也要求提供分析的方法,因此,在经典密码学继续发展的同时,用计算机进行秘密存贮和信息分析的计算机密码学正在形成。当前密码学不仅用于传统的军事和外交领域,而且还用于广阔的商业领域。在现代密码设备中,除了分组密码外,几乎都是建立在序列密码基础上的。所以,序列密码(也叫做密钥流密码)被认为是当前最通用的体制。它没有错误的扩散,能提供现代加密的最重要手段。本文介绍序列密码的编码思想,基本概念,线性反馈移位寄存器(LFSR)以及十年多来发展动向。
More and more people pay more attention to the protection and confidentiality of communication today. The real need and the widespread use of computers and (?) Electronics have revolutionized cryptography. The increasing use of computers to process and store confidential information requires the proper protection of programs or data stored and transmitted by the user against theft and analysis by others. Computers are also powerful devices for the rapid analysis of information, which also requires analytical methods. As a result, as cryptography continues to evolve, computer cryptography that uses computers for secret storage and information analysis is taking shape. Current cryptography is used not only in the traditional military and diplomatic arena, but also in vast commercial areas. In modern cryptographic devices, except for grouping passwords, almost all are based on a sequence of passwords. Therefore, the serial password (also known as the key stream password) is considered as the current most common system. It has no false proliferation, providing the most important means of modern encryption. This article introduces the idea of encoding serial passwords, basic concepts, linear feedback shift register (LFSR), and more than a decade of development.