想象一个2维的艾卡萨符号密码的影像，想象这个影像就绘制在你前额内的黑色背景上。
Imagine the 2-dimensional image of a "Eckasha Symbol Code", as if the image is drawn on a black background on the inside of your forehead.
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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