GCHQ releases 'most difficult puzzle ever' in honour of Alan Turing

Alan Turing was prosecuted for indecency in 1952 over his relationship with another man in Manchester. Photograph: AP

Alan Turing was prosecuted for indecency in 1952 over his relationship with another man in Manchester. Photograph: AP

source https://www.theguardian.com/uk-news/2021/mar/25/gchq-releases-most-difficult-puzzle-ever-in-honour-of-alan-turing