雙語暢銷書《艾倫圖靈傳》第5章:解謎接力賽(16)

From the cryptanalyst's point of view, however, the physical labours of the cipher clerk, and the physical construction of the machine, were irrelevant.

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然而，從密碼分析的角度來看，密碼操作員的工作量與機器的物理結構無關，

What mattered was the logical description, just like a Turing machine.

而是在於它的邏輯原理——就像圖靈機。

Everything relevant to the Enigma was contained in its 'table', a list of its states and what it would do in each state.

謎機的一切，都可以體現在一個行爲表中，這張表描述了它的每個狀態，以及在每個狀態下會做什麼。

And from a logical point of view, the action of the Enigma, in any given, fixed, state, enjoyed a very special property.

從邏輯的角度上看，謎機在任何一個給定的狀態下，都會執行一種特定的動作。

It was a symmetrical property inherent in the 'reflecting' nature of the machine.

這是機器的“反射”性質固有的對稱性質。

For any Enigma, in any state, it would be true that if A were enciphered into E, then in that same state, E would be enciphered as A.

對於一臺謎機，無論在任何狀態下，如果它將A替換成E，那麼在同樣的狀態，E就會被替換成A。

The substitution alphabets resulting from an Enigma state would always be swappings.

謎機的替換表，實際上是一種對換。

For the hypothetical 8-letter machine in the state shown in the first diagram, the substitution would be:

我們前面假想的8字母機，在第一幅圖的狀態下，替換規則是：

plain A B C D E F G H

明文ABCDEFGH

cipher E D G B A H C F

密文EDGBAHCF

For the machine in the state shown in the second diagram, it would be:

在第二幅圖的狀態下，則是：

plain A B C D E F G H

明文ABCDEFGH

cipher E F G H A B C D

密文EFGHABCD