For the first time in more than 60 years a Colossus computer will be cracking codes at Bletchley Park. The machine is being put through its paces to mark the end of a project to rebuild the pioneering computer. The Colossus machine will be pitted against modern computer technology that will also be used to decipher and read the transmitted messages. Tony Sale, who led the 14-year Colossus re-build project, said it was not clear whether the wartime technology or a modern PC would be faster at cracking the codes. "A virtual Colossus written to run on a Pentium 2 laptop takes about the same time to break a cipher as Colossus does," he said.