Captain Raymond "Jerry" Roberts, one of the last surviving Bletchley Park code-breakers, has died.
Roberts worked as a linguist and during the Second World War became one of the first members of the Testery, working to unravel the encryption codes used to send messages between Hitler and his generals.
This work, later assisted by the Colossus computer, is widely believed to have shortened the war by two years.
Andy Clark, a trustee of the National Museum of Computing, said: "He told us he did not fully appreciate the significance of his work until the early 2000s, when the story of Tunny and Colossus began to be released in greater detail.
"It was then that he started to campaign for recognition of the work of the code-breakers – not himself, but for Bill Tutte, Tommy Flowers, Alan Turing and others. The energy and effectiveness of his campaigning was a marvel and an inspiration to us all."
Computer Weekly spoke to Roberts in 2010 as part of the Unsung Heroes of IT series of articles. Watch the video >>