1940年11月14日,英国著名工业城市考文垂遭到了德国空军猛烈地攻击。“恐怖的鬼夜”过后,考文垂5万座建筑化为灰烬,地面设施近乎全毁。令人想不到的是,这场近乎毁灭性的攻击计划,丘吉尔其实已从一份被破译的情报中提前得知了。这份绝密的情报来源于英国情报局密码破译中心。为了保护情报的机密性,1936年,希特勒情报局启用了安全性更高的恩尼格玛密码。 November 14, 1940, the famous British industrial city of Coventry was fiercely attacked by the German air force. “Horrible ghost night ” after the construction of 50,000 Coventry Covenant ashes, ground facilities almost destroyed. Unexpectedly, this almost devastating attack plan, Churchill has actually been informed in advance from a deciphered intelligence. This top-secret intelligence comes from the British Bureau password cracking center. To protect the confidentiality of intelligence, in 1936, the Hitler Intelligence Agency enabled a more secure Enigma password.