ANN: obfuscate
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From: MRAB on 11 Feb 2010 13:24 Paul Rubin wrote: > Gregory Ewing <greg.ewing(a)canterbury.ac.nz> writes: >> Actually I gather it had a lot to do with the fact that the Germans >> made some blunders in the way they used the Enigma that seriously >> compromised its security. There was reportedly a branch of the German >> forces that used their Enigmas differently, avoiding those mistakes, >> and the British never managed to crack any of their messages. > > I think you are thinking of the Kriegsmarine (naval) Enigma. Yes they > were more careful with procedures, but the machine was also harder to > crack because it had four rotors instead of three. IIRC, the Brits were > eventually (1942?) able to capture one by shooting up a German submarine > and boarding it to get the machine while the sub was sinking; a British > sailor wasn't able to get out in time and drowned during that operation. > Getting the rotor settings off the captured unit (they may have had to > do it more than once) was enough to get a foothold into the code. My > memory is hazy on this by now so I may have some parts wrong, but David > Kahn's book "Seizing the Enigma" tells the story (I read it many years > ago). A fictionalized version appears in Neil Stephenson's novel > "Cryptonomicon". U-559? I think that's the one where Hollywood made a film about it, but portraying it as a purely American action. That didn't go down too well in the UK!
From: Bob Martin on 12 Feb 2010 02:16 in 144446 20100212 034121 Paul Rubin <no.email(a)nospam.invalid> wrote: >See http://en.wikipedia.org/wiki/Colossus_computer >That was almost at the end of the war though. Colossus was working by the end of 1943 - the year that the Americans first dropped bombs on Germany ;-)
From: Tim Golden on 11 Feb 2010 07:43 On 11/02/2010 11:32, Paul Rubin wrote: > Gregory Ewing<greg.ewing(a)canterbury.ac.nz> writes: >> Actually I gather it had a lot to do with the fact that the Germans >> made some blunders in the way they used the Enigma that seriously >> compromised its security. There was reportedly a branch of the German >> forces that used their Enigmas differently, avoiding those mistakes, >> and the British never managed to crack any of their messages. > > I think you are thinking of the Kriegsmarine (naval) Enigma. Yes they > were more careful with procedures, but the machine was also harder to > crack because it had four rotors instead of three. IIRC, the Brits were > eventually (1942?) able to capture one by shooting up a German submarine > and boarding it to get the machine while the sub was sinking; a British > sailor wasn't able to get out in time and drowned during that operation. > Getting the rotor settings off the captured unit (they may have had to > do it more than once) was enough to get a foothold into the code. My > memory is hazy on this by now so I may have some parts wrong, but David > Kahn's book "Seizing the Enigma" tells the story (I read it many years > ago). A fictionalized version appears in Neil Stephenson's novel > "Cryptonomicon". And for those who haven't been to Bletchley Park [*] I recommend it. Not only is it full of interesting stuff, but it has an engagingly amateurish air about it which I personally prefer to the sleek-and-shiny nature of many museum-y places today. When I was there last summer I was disappointed to see that they'd closed the Pigeon Museum. But the Model Railway club was still there (altho' we were too late in the day to get in) and the new Computing Museum is full of delightful nostalgic clutter being worked on by enthusiastic people. My kind of place.. TJG [*] http://www.bletchleypark.org.uk/
From: Jean-Michel Pichavant on 12 Feb 2010 05:33 Bob Martin wrote: > in 144446 20100212 034121 Paul Rubin <no.email(a)nospam.invalid> wrote: > > >> See http://en.wikipedia.org/wiki/Colossus_computer >> That was almost at the end of the war though. >> > > Colossus was working by the end of 1943 - the year that the Americans first dropped > bombs on Germany ;-) > sept 1939 - sept 1945. It's nearer from the end, than from the begining. JM
From: Bob Martin on 12 Feb 2010 10:13
in 144460 20100212 103319 Jean-Michel Pichavant <jeanmichel(a)sequans.com> wrote: >Bob Martin wrote: >> in 144446 20100212 034121 Paul Rubin <no.email(a)nospam.invalid> wrote: >> >> >>> See http://en.wikipedia.org/wiki/Colossus_computer >>> That was almost at the end of the war though. >>> >> >> Colossus was working by the end of 1943 - the year that the Americans first dropped >> bombs on Germany ;-) >> >sept 1939 - sept 1945. It's nearer from the end, than from the begining. If I must spell it out ;-) Near the end for us Brits but the Americans were only just getting into the action in Europe. |