Re: Enigma Variations and UKW A

 All...

It should of course be noted that though a physical example of UKWA
has proved to be elusive BP had recovered its wiring. We know this
from unpublished material in the BP Archives - specifically the
handwritten notes of cryptologist Oliver Lawn dated 9 May 1942 and
referred to by Frode and Phil Marks in both the Acknowledgements
and the References sections of their Cryptologia article.

FWIW I agree with Geoff Sullivan on the OT subject of 'bus passes',
etc.

David Hamer

At 05:26 3/30/2007, Frode Weierud wrote:

>Hello all,
>
>I have read with interest the latest postings on BP entrance fees and
>the plea 
>for more cryptological discussions. The BP Mailing list has been
>hibernating 
>for quite some time so even the entrance fee postings I found to some
>extent 
>simulating. At least it brought me out of my deep slumber.
>
>Norman's last posting about the BCS-ISSG's seminar titled 'Enigma
>Variations' 
>further triggered my imagination. The reason being that back in 1998
>David 
>Hamer, Geoff Sullivan and myself published an article in Cryptologia
>with the 
>title "Enigma Variations: An Extended Family of Machines". An updated
>version 
>is available here:
>http://frode.home.cern.ch/frode/pubs/enigvar.pdf
>
>For some time I have been thinking of publishing a sequel to this story
>with 
>hopefully new and interesting information about the Enigma machines,
>their use 
>and development. I will not reveal all my new knowledge here but I
>thought a 
>small quiz could be of interest. I know the correct answer to my
>question and 
>when you all are fed up with this little puzzle I will let you have the 
>details.
>
>The question concerns the Enigma reflector A, Umkehrwalze A - UKW A. In 
>January 2000 Philip Marks and myself published an article in Cryptologia
>with 
>the title "Recovering the Wiring of Enigma's Umkehrwalze A". The article
>is 
>available here:
>http://frode.home.cern.ch/frode/pubs/ukwa.pdf
>
>As you can see from this article the wiring of UKW A was recovered 
>analytically because we never had come across a real UKW A where we
>could 
>measure the wiring. And as far as I know this is still the case. After
>1945 
>nobody has ever seen a UKW A. My question is simple:
>
>Why do you think we have never found a Umkehrwalze A?
>We know they existed. The Poles recovered the wiring.
>
>The quiz if open.
>Unfortunately, I am not in a position to offer any other prize than the
>truth.
>
>Best wishes,
>        Frode


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