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Questions have been asked about whether a government petition calling for Brexit to be cancelled has been swamped by bots. Bots are automated programmes which can carry out a command thousands of times. The BBC spoke to three cyber-security experts about how likely it is that a number of the 3m signatures gathered so far are not genuine. They all agreed that the petition's email validation process would be a deterrent. Each signature requires a unique email address to which a verification link is sent before the vote can be accepted. UK-based voters must also share a valid postcode. While email addresses are easy enough to set up, doing that in real time at high volume is less straightforward. Full story

22 March