Her mathematician father was a key member of the team that broke the Enigma code at Bletchley Park, writes his artist daughterJohn Herivel, my father, was a codebreaker at Bletchley Park during the second world war. He was a gifted mathematician but it was his lateral thinking that shed light on the way Germans operated the Enigma machine that encrypted military messages. His way of breaking the Enigma ciphers became known as the Herivel Tip or Herivelismus. One evening at Bletchley Park he tuned into the mind of a German Enigma operator: what would he do if he was tired and overworked? Would he cut corners? My father's breakthrough came out of these thoughts.He was born in Belfast in 1918 and attended Methodist College. Though he could not recall when his mathematical ability first appear...

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