imran uddin used a keyboard spying device to hack into university computers and changing his marks has been jailed .
imran uddin , 25 , who was studying science , bought keyboard spying equipment on the internet which he then connected to a number of university computers .
through the software , which recorded key strokes , he was able to find out the passwords that staff were typing in to log in to the computers .
he was jailed for four months at birmingham crown court on thursday .