Intercept date: 2nd November 1944 on a German Air Force frequency.
Known ending of 3rd part of first message GEHEIMKLAMGAZOPXGAZOP but
suspect at least 8 padding characters after it. Second message on same
steckers but different wheel order and rings. Required: decrypt
of second message.
First thing is to find possible positions for the crib at the end of
part three of the first message. Start with the last letter of the crib
aligned with the end of the message. This gives a clash on E so it can't
be here. Shift left to 8th letter. Clash here so keep shifting left.
At 11 no clashes so it could be here. Make up
a Bombe menu and run it on the High Speed Bombe. No stops found. So shift
crib left again. No clashes so try a menu on this. No drops so move on.
Eventually you get a menu which gives just one drop. This also gives
you eight out of the 10 steckers. Try deciphering the start of the
message by winding back from start of crib to start of message and
two more steckers will be found and a turnover point. This sets the
right hand wheel ring.