The offline computer is housed in a glass room and in theory can only be accessed by two people at the same time. It is also constantly monitored by a video camera.

It is alleged Mr Tipton used his position as security director to change the video camera settings and record only one second in every minute. This would have given him enough time to enter the room and plug a thumb drive into the computer.

On that drive, according to the prosecution, was a rootkit: a stealthy computer program designed to do a specific task and, in this case, then erase itself.

That task was to predetermine the winning lottery numbers for the draw that Mr Tipton was to later buy the winning ticket for.   

Mike McLaughlin, senior analyst at computer security company First Base, said the allegation might sound farfetched but was plausible.

He told the BBC: "It is entirely possible to code a rootkit on a USB drive which could interfere with software on a computer then delete itself. 

Read more on BBC



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