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Dorabella & D'Agapeyeff Ciphers - Solutions
Running Key - the complete text and explanation
Part 1 Segments (with associated CV)
RK1 (CV1): Is Mr A nuz ban hearcy o' the daemon Q (the question is answered by RK2)
Is mystery news ban hearsay of the daemon ?
RK2 (CV2): A: Siks talk o' thut sixty cix
A [=Answer]: 6/66 (the D-Notice or letter); talk o' thut=say "of that" - ie - "/"
RK3 (CV3): Naughty E
the cryptographer is telling us that a particular letter (in this case E) can misbehave - a documented feature of Running Key systems
Part 2 Segments - the X Y conundrum (with associated CV)
RK4 (CV4): Nature's Y.... (continues into RK5)
RK5 (CV5): is X; Y befor aught I'm Qrd of, so for- (continues into RK6)
RK6 (CV6): -get why. I'm X. By myself, I'm the loving letter.
The 3 parts of the conundrum are explained thus:
Nature's Y is X
At first sight a contradiction (male=female?), Y is the daughter of AG Denniston (Head of GC&CS 1921-1942), who gave the nickname Y to his first child (before birth) – explaining that it was then an unknown quantity. Born in June 1925, Margaret was known as Y until at least 1961 and probably beyond. [On the death of her father in 1961, eminent US cryptanalyst W F Friedman paid tribute to Denniston's war work, writing to Margaret and addressing her simply as “Dear Y”.]
Y befor aught I'm Qrd of, so forget why
Y before aught I'm cured of, so forget Y
The cryptographer responsible for the Dorabella cipher spent a number of years attached to the Kings Own Scottish Borderers, whose regimental home is Berwick. He is saying he is cured (=Qrd) of the habit of putting a ‘Y’ before everything (as in Geordie/North-East speech - eg - “weh aye, man”), so forget why (="Y").
[A Geordie relative informs me that today's Geordies have to an extent shed the habit. I hope nobody is offended by the Keytext!]
I'm X. By myself I'm the loving letter.
Quite simply, X on its own is a kiss! [Coincidentally, Dorabella is the Variation X of the Enigma Variations.]
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