The issue focused on whether officials could release data about whether files had been tampered with and whether data could have been accessed without permission.There were growing concerns about government computers being hacked by hackers from China.Some experts thought it would not be possible to prove any hacking had taken place.How long could information remain hidden?Data protection experts say any files held by the UK government should be stored securely and updated regularly.They say there are currently around 60 different methods for storing data that could be accessed by hackers.These