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前言为了支持一种全新的语言保密系统一密码电话的发展,作为所需要的基础研究部份,已经进行了本文中描述的工作。这种全新的语言保密系统使用一种密钥产生器,其初态是经过变换的输入密钥,大部份输入密钥通常由用户提供。对这一产品,人们认为,一种有用的性能是,利用机械结构,在每次呼叫之初,能自动产生用户密钥,因此,可避免密钥分配的麻烦。要不然,用户在安全通话之前,应该进行密钥分配。这里,实现密钥自动产生的最有利的技术是公开密钥法,它利用对数问题来实现。这方法最初由W·狄菲和赫尔曼(Whitfielb Diffie anb Hellman)提出。这方法要求安全通信线路的每个终端设备都要计算
Preface To support the development of a new language security system, a cryptographic telephone, the work described in this article has been conducted as part of the basic research required. This new language security system uses a key generator whose initial state is a transformed input key, and most of the input keys are usually provided by the user. For this product, it is believed that one useful property is the use of a mechanical structure that automatically generates user keys at the beginning of each call, thereby avoiding the hassle of key distribution. Otherwise, the user should perform key distribution before making a secure call. Here, the most advantageous technique for automatic key generation is the public key method, which takes advantage of the logarithm problem. This method was first proposed by Whitfield and Whitman Hellman. This method requires that each terminal device of a secure communication line be calculated