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Enigma working aid

Codebreakers made working aids from whatever materials were available. Few survive and knowledge about they were used has largely been lost. this example is thought to have helped in the breaking of 3-rotor Enigma machine ciphers,

Index cards

Revealing secret weapons

Among the intelligence discovered from messages and stored on cards was information about the construction and launch of Germany’s secret weapons - the V1 flying bomb and V2 rocket - used against Britain towards the end of the war.

Modified Typex Machine

The Typex was a British encryption machine used by its armed forces. It was more secure and versatile than Enigma. Staff at BP used a different version, adapted to work exactly like Enigma, in the final stage of deciphering enemy messages.

WASHINGTON, DC: U.S. Department of Justice, Oct. 4, 2019

Lawless Spaces: Warrant-Proof Encryption and its Impact on Child Exploitation Cases

Sarah Baker/NCMEC

 

Bottom board filter cap values

 

Reverse-engineering & background: www.eevblog.com/forum/projects/avionics-teardown-reverse-...

BP’s Hit 3 is marked on this diagram showing the chain of commununication for intelligence during the Allied invasion of Normandy in 1944. ‘ANCFX’ was the Allied naval commander, Admiral Bertram Ramsay. ‘CinC’ means Commander in Chief.

In and Around Milton Keyes

Bletchley Park

 

www.bletchleypark.org.uk/

The point of all this, a German Lorenz SZ42 teletype encryption peripheral, aka codename TUNNY/FISH.

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2 our of 7 neighbors w/ no encryption (and the rest with weak WEP)

BP alerted the Admiralty to the positions of enemy U-boats hunting the Allied convoys in the Atlantic. This map shows how in September 1943 a convoy split and the ships taking the northern route intercepted and forced a battle with the U-boats.

...by the group who was stranded after an avy blocked the tunnel...we speculated as to whether they really waited around on the 27th to finish this up? "Oh really, we are rescued? Can you wait just a minute while we add that date to our carving?"...

 

...Or did they return to do this at a later date just to test fate...?

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