APRIL 3 2021 — To celebrate Alan Turing featuring on the new £50 banknote, GCHQ has created their hardest puzzle ever in his honour. Follow us on Twitter: @INTEL_TODAY
RELATED POST: Remembering Alan Turing (23 June 1912 – 7 June 1954) 
RELATED POST: On This Day — First Modern Computer Delivered to German Aerospace Institute (May 12 1941)
RELATED POST: On This Day — Enigma Machine Captured (May 9 1941)
RELATED POST: Key figures in UK Sigint: Conel Hugh O’Donel Alexander
RELATED POST: GCHQ — Sir Peter Harvey Marychurch (13 June 1927 – 21 May 2017)
Alan Turing was a mathematician, cryptographer and pioneer of computer science who possessed one of the greatest brains of the 20th century.
His life was one of secret triumphs shadowed by public tragedy. It has been estimated that his work shortened the war in Europe by more than two years and saved over fourteen million lives.
A quick comment — GCHQ writes: “On the 8th June 1954, Alan Turing took his own life.”
This is a mistake. Turing’s housekeeper found him dead on 8th June 1954 but he had committed suicide the previous day.
The Turing Challenge
The Turing Challenge requires you to solve a string of puzzles which get increasingly difficult. Crack the answers to the first 11 puzzles which should give you 11 single words or names which you’ll need your very own Enigma simulator to decode! Ready?
Puzzle #1 — Hut 8
The questions begin with a relatively straightforward crossword-style puzzle that starts by asking where GCHQ’s predecessor agency, where Turing worked, was based during the second world war. A two-word answer, nine letters then four, is required.
The stylistic 8s in the pattern above the bank building on the front of the note refer to Hut 8, one of the sections of GC&CS. Hence the importance of the 8th column below!
The answers to these questions are quite obvious but the result for the 8th column is already puzzling!
The answers to these questions are:
BANK OF ENGLAND
If you then selected the 8th letter of each answer, you obtain:
Answer 1 = EUGENIA
Keep in mind that you need to solve puzzles 1 to 11 in order to get a shot at the final meta-puzzle 12!
Puzzle #2 — Portrait
This one is not too difficult either. And GCHQ just gave us some serious HINT:
Here is a hint for puzzle two
-… -. . ..-. … …… -..
OK, I will give you an additional clue. Let us re-write the caption like this:
The portrait is by Elliott & Fry ; a
bromide print taken on 29 March 1951 , one
of three from the National Portrait
Now, you should see some similarities with the ‘encrypted’ text. Good Luck!
Take a look at the clue from GCHQ. Count the letters and the spaces in the plain text and in the coded text. In both cases, you find:
4 – 2 – 1 – 4 – 3 – 6 – 3
It is probably no coincidence and it is reasonable to assume that this is the same message. Then what?
Most letters have been replaced by a dot, and a few ones by an over-bar. The latter ones are:
H I N T
Back to puzzle 2, you will notice that the structure of the text (caption of the portrait) and the coded message is again identical. The punctuation was a dead giveaway!
Let us select the letters with an over-bar and we obtain:
Answer 2 = FATHERING
Puzzle #3 — Bits of Notes
First, take a good look at both sides of the the £50 banknote!
Question — Can you shed some light on these sequences?
INTEL TODAY — Here is a clue. Look at the 3 small pics of sequence (1) and find out where they are on the £50 banknote. And then, just connect the dots!
If you succeed, just repeat the operation…
***** ***** ***** ***** *****
Bank of England unveils new £50 banknote
Alan Turing — a short biography by Andrew Hodges
The Turing Challenge — GCHQ
GCHQ releases ‘most difficult puzzle ever’ in honour of Alan Turing — The Guardian
GCHQ — Play the TURING Challenge! [Puzzle #1]
GCHQ — Play the TURING Challenge! [Answer to Puzzle #1 & Clue to Puzzle #2]
GCHQ — Play the TURING Challenge! [Answer to Puzzle #2 & Clue to Puzzle #3]