BBC has published a new documentary “Code-Breakers: Bletchley Park’s Lost Heroes that focuses on how Tunny (or Lorenz, the cipher machine used by Nazi high command) was broken in Bletchley Park during the World War II, and concentrating on feats of William Tutte and Tommy Flowers. Highly recommended. If you are not living in the UK, there are other means to get access to the documentary.
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