Codes in History

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Across
  1. 4. Which country did the mathematicians come from who brought a coding machine to the UK at the beginning of Ww2?
  2. 5. What was the German coding machine in WW2 called?
  3. 6. What was the name of the ten computers that were created to help break the German codes?
Down
  1. 1. Alan ------ was the key person who helped break the German codes and invented modern computing.
  2. 2. What did Lysander of Sparta write a coded message on?
  3. 3. What did Histiaeus tell Aristogorus to give his slave?
  4. 4. Bletchley ---- was the place where British codebreakers worked.
  5. 6. A particularly difficult what was published in the Daily Telegraph to help find people who were good at puzzles?