双语畅销书《艾伦图灵传》第5章:解谜接力赛(12)
Everyone knew of it, everyone, at least, who had a 1938 edition of Rouse Ball's Mathematical Recreations and Essays as a school prize.
A revised chapter written by the U.S. Army cryptanalyst, Abraham Sinkov, wheeled out all the antiquated grilles, Playfair ciphers, and so forth, but also mentioned that
其中有一章是美军密码分析员艾博瑞汉·辛科夫写的，他提到：Quite recently there has been considerable research carried on in an attempt to invent cipher machines for the automatic encipherment and decipherment of messages. Most of them employ periodic polyalphabetic systems.
最近有很多研究，旨在发明一种密码机器，对信息进行编码和解码，大部分是基于周期性的单字母替换。
A 'periodic' polyalphabetic cipher would run through some sequence of alphabetic substitutions, and then repeat that sequence.
周期性的单字母替换，是指有一些字母替换的序列，然后不断地重复使用这些序列。The most recent machines are electrical in operation, and in many cases the period is a tremendously large number.…
最新的机器是用电驱动的，通常情况下，周期是一个非常大的数……These machine systems are much more rapid and much more accurate than hand methods.
这些机器系统速度极快，准确性比人工操作高很多。They can even be combined with printing and transmitting apparatus so that, in enciphering, a record of the cipher message is kept and the message transmitted;
它们还可以与印刷机和发报机组合起来使用，可以自动完成编码、发送和记录的一条龙工作，in deciphering, the secret message is received and translated, all automatically.
它们还可以与印刷机和发报机组合起来使用，可以自动完成编码、发送和记录的一条龙工作，So far as present cryptanalytic methods are concerned, the cipher systems derived from some of these machines are very close to practical unsolvability.
以目前的密码技术来看，这些机器的性能是手工操作完全无法达到的。Nor was there anything secret about the basic Enigma machine.
同样，原型版的谜机也不是秘密。It had been exhibited in 1923, soon after its invention, at the congress of the International Postal Union.
同样，原型版的谜机也不是秘密。It was sold commercially and used by banks.
同样，原型版的谜机也不是秘密。
