The Enigma Story: the Truth Behind the 'Unbreakable' World War II Cipher by John Dermot Turing

Author:John Dermot Turing [Turing, Dermot]
Language: eng
Format: epub
Tags: History
ISBN: 9781398818040
Publisher: Arcturus Digital Limited
Published: 2022-04-01T14:40:09+00:00

A vehicle adapted for SLU reception, in the North African campaign.

Further rules on use of ‘Ultra’ precluded indoctrinated officers being placed in combat zones where they were at personal risk of capture; and the careful use of cover when ‘Ultra’ was used as the basis for an operation. When the Enigma messages decrypted by Knox’s team at Bletchley laid the foundation for the attack on the Italian fleet at Matapan, the source was protected by having a spotter plane fly over the fleet – the point being that the spotter plane was not so much to spot the fleet, but be spotted by it.

Commanding officers did not always respect the rules. Winter­botham records

I had to tell them at one and the same time that they would be supplied with the actual signals of the enemy on the highest level, and that they must also conform to strict security regulations as to its use, the main one being that they must not take any immediate action on the information which might lead the enemy to suspect that we knew his plans… Some commanders were … a bit unhappy about the restrictions put on its use.

Aggressive in-the-know generals refused to stay in safe quarters far from the front: US Generals Patton and Doolittle took risks but without ill effect. Sometimes the information was too tempting to resist, as when the US Navy targeted refuelling ‘milch cow’ submarines in 1944, causing the Germans to put in place a new investigation into the security of their own communications.

That, however, is to anticipate success on Naval Enigma, which in the early years of World War II remained elusive. The Naval Enigma was more resistant to attack than German Army and Air Force Enigma. Notwithstanding that the greatest threat to the survival of Britain came from the sea, the ease with which army and air force intelligence could be squeezed from Enigma directed resources away from the intractable naval problem into these more profitable areas. Huts 4 and 8 were likely to dry up unless something could be done. But the head of Hut 8 was Alan Turing. Maybe something was possible.

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