'They kept secrets - which is hard to imagine today.' The daughter of a World War Two codebreaker speaks about her father's role in efforts to decrypt Germany's Enigma codes.
Mr Herivel who died at the age of 92 in 2011.
She told BBC News NI's Evening Extra programme that her father would have been pleased by the recognition. "He would sit with his feet up, I think there was a fire, and on one particular evening he went into a strange half-asleep, half-awake [state]."He had an idea of a German wireless operator who at the beginning of some major offensive would be starting to cut corners and not sticking to the rules entirely."But the thing is it did happen and that's when so many messages came in.
While Alan Turing is the highest profile among the code breakers, Dr Abrutat said the effort across Bletchley Park was a "team sport".Image caption,The Ulster History Circle chairman Chris Spurr said Mr Herivel was an insightful mathematician who discovered a way of breaking the Enigma code by hand.
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