雙語暢銷書《艾倫圖靈傳》第5章:解謎接力賽(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
其中有一章是美軍密碼分析員艾博瑞漢·辛科夫寫的，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，旨在發明一種密碼機器，對信息進行編碼和解碼，大部分是基於週期性的單字母替換。
A 'periodic' polyalphabetic cipher would run through some sequence of alphabetic substitutions, and then repeat that sequence.
週期性的單字母替換，是指有一些字母替換的序列，然後不斷地重複使用這些序列。The most recent machines are electrical in operation, and in many cases the period is a tremendously large number.…
最新的機器是用電驅動的，通常情況下，週期是一個非常大的數……These machine systems are much more rapid and much more accurate than hand methods.
這些機器系統速度極快，準確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;
它們還可以與印刷機和發報機組合起來使用，可以自動完成編碼、發送和記錄的一條龍工作，in deciphering, the secret message is received and translated, all automatically.
它們還可以與印刷機和發報機組合起來使用，可以自動完成編碼、發送和記錄的一條龍工作，So far as present cryptanalytic methods are concerned, the cipher systems derived from some of these machines are very close to practical unsolvability.
以目前的密碼技術來看，這些機器的性能是手工操作完全無法達到的。Nor was there anything secret about the basic Enigma machine.
同樣，原型版的謎機也不是祕密。It had been exhibited in 1923, soon after its invention, at the congress of the International Postal Union.
同樣，原型版的謎機也不是祕密。It was sold commercially and used by banks.
同樣，原型版的謎機也不是祕密。
