An amateur cryptographer has beaten Colossus in a code-cracking challenge set up to mark the end of a project to rebuild the pioneering computer.
The competition saw Colossus return to code-cracking duties for the first time in more than 60 years.
The team using Colossus managed to decipher the message just after lunch on 16 November.
But before that effort began Bonn-based amateur Joachim Schuth revealed he had managed to read the message.
"He has written a suite of software specifically for the challenge," said Andy Clark, one of the founders of the Trust for the National Museum of Computing at Bletchley Park where Colossus is sited.
News of Mr Schuth's success reached Bletchley Park on Thursday night, said Mr Clark.
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Tony Sale led the 14-year Colossus re-build project and it took so long because all 10 Colossus machines were broken up after the war in a bid to keep their workings secret. When he started the re-build all Mr Sale had to work with were a few photographs of the machine.
In its heyday Colossus could break messages in a matter of hours and, said Mr Sale, proved its worth time and time again by revealing the details of Germany's battle plans.
