Early in the second world war, Britain took its time to let America into the secrets of Ultra, the decryption of German secret communications by code-breakers at Bletchley Park.
第二次世界大战的早期，英国花时间让美国获知了Ultra的机密，这是电码译者在BletchleyPark破译的德国机密通信的译码。
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.
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.
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”。
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