Alright, I didn’t know the code was from GCHQ and I only saw it on the last night of the “game” (30.11.11), so I suspect I would have needed a lot longer than a couple of hours to crack (try infinitly long). I did however make a start. Here’s the screen save I made:
Oh damn – it won’t upload – security block ! Cunning.
So here are the first block (left-hand side) of hexadecimal numbers presented on the screen:
First thing I did was convert this first Hexadecimal into 8-bit Binary, to see if a visual pattern developed, which would lead to the next clue:
No ? Nothing ?
I thought I saw a “naked lady with socks on” (as usual) but my psychotherapist said try something else …
… Murray-Baudot is 5-bit and there are 10 rows, so maybe if I look down the rows ….
I’ll update when I’ve finished. I bet Turing would have done this in a trice.
PS. Great idea GCHQ. Another one please.
Update 05.12.11 , here are the full matrices copied by hand. I’ve done some ANDing and ORing but still nothing … what about just mapping to ASCII codes ? (0 to 255 or, 00 to FF)