雙語暢銷書《艾倫圖靈傳》第5章:解謎接力賽(150)
As with Enigma, there was always the possibility of an eventual hardware capture, and the German cryptographers should have allowed for that possibility.
But the important break into this type of traffic did not, as it happened, come about in this way.
但是破解這套系統的關鍵，並不在於此。In 1941 someone at Bletchley guessed that a certain message had been sent out twice, and in a very particular way.
1941年，布萊切利有人猜測說，有一條信息通過某種特定的方式發送了兩遍。
Some fault in the system for using the machine had allowed an elementary blunder.
缺少完善的機器操作規範，就會導致這種低級的失誤。The message had been sent out each time enciphered by the same key, but with the key advanced by one character in one transmission.
那條信息發送了兩次，用的是相同的密鑰，但在第二次發送時，將密鑰錯開了一位。Once this guess had been made, the recovery of both key and plain-text was a simple step.
猜測到這一步之後，破譯它的明文就是信手拈來。The sequence of key thus elucidated should have appeared to be random, without any discernible pattern. But it was not.
要想做到安全，密鑰序列應該隨機生成，不能有任何能被識別的規律。但事實卻不是這樣。The decisive observation was made by W.T. Tutte, a young Cambridge chemist turned mathematician.
劍橋的一位化學家W.T.托蒂，觀察到一個非常重要的現象，This was the breakthrough equivalent to what the Poles had achieved with the Enigma in 1932.
其重要性不亞於波蘭人1932年在謎機上的突破。Like that work, it constituted a logical rather than a physical capture of the machine, and again it was only the very first step, the sine qua non.
他沒有繳獲實體的機器，而是構造了一個邏輯模型，這是第一步，是首要條件。But one difference was that this time German industry had made a more serious effort. This was not a jumped-up version of a commercial device as was the Enigma.
但這次與謎機不同的是，這套系統並不是商業版的升級。Another difference lay in its part in the German military system. This traffic was sparse but juicy, carrying high-level reports and appreciations.
另外一個區別是，這些通信雖然零碎，但卻包含着更高級別的命令和報告。It brought Bletchley much closer to Berlin, at a time when Hitler was taking over personal direction of the war.
它們使布萊切利與柏林的距離更近了。
