Those of you with backgrounds in history or we've seen -- or remember World War II with technologies that were used in it might know of the Enigma machine, which is kind of the same idea.
你们其中有历史背景的人或者我们看到的-，或记得起的第二次世界大战中使用的，可能知道的英格玛装置，那是一种同样的思想。
In addition to the complexity of the Enigma machine itself, its operating procedures became increasingly complex, as the German military wanted to make Enigma communications harder to code break.
为了使盟军无法破译恩尼格玛密电，德军还专门制定了一套极为复杂的密码使用规则，尽管恩尼格码机本身就是极端复杂的。
It turned out to be Germany's famous Enigma coding machine.
那原来是德国著名的恩尼格玛密码机。
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