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Puzzle 9 - Signature

#TuringChallenge

On a red background littered with Turing's diagrams and notes, sits a photograph of Turing and an old, torn sheet of paper. On the paper is the following O(b), Q(a), C(a), R(b), J(a), D(b) Turing's signature sits underneath

The signature used comes from Max Newman’s visitor book, as displayed below:

A copy of Max Newman's visitor book inlcuding Turing's signature

Max Newman's visitor book including Alan Turing's signature - © Bletchley Park Trust

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