阿兰·图灵是英国的一位科学家、数学家、逻辑学家和译码者，可以说是20世纪英国最伟大的科学家。
Alan Turing was an English scientist, mathematician, logician, and cryptographer, and arguably the greatest British scientist of the 20th century.
举个最简单的例子，当发送方将一束光子流传送给接受方，必须从两种模式中的选取一种对其中的光子进行编码（译码者通常称发送方为爱丽丝，接受方为鲍勃）。
The simplest example is when the sender (whom cryptographers usually call Alice) dispatches a stream of them to the receiver (who is known as Bob). These photons will have one of two modes.
毫无疑问的，美国和英国非常清楚苏联很快就发现了Venona的存在，并更改了了他们的密码和密码机在1948年10月29号—译码者的“黑色星期五”。
Indeed, America and Britain were so deeply penetrated that the Russians soon found out about Venona, changing their codes and cipher machines on October 29th 1948—"Black Friday" for code-breakers.
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