The Germans used a "high security teleprinter cypher machine to enable them to communicate by radio in complete secrecy," writes Bletchley Park scientist Tony Sale on his Codes and Ciphers Web site. It was called Lorenz, and this device "had to be cracked by carrying out complex statistical analyses on the intercepted messages," the Bletchley Park museum site reads. "Colossus could read paper tape at 5,000 characters per second and the paper tape in its wheels traveled at 30 miles per hour. This meant that the huge amount of mathematical work that needed to be done could be carried out in hours, rather than weeks."
This is a closeup of the Colossus rebuild at Bletchley Park today.
July 4, 2011 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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