Dr Steven Murdoch (UCL Computer Science) comments on the supposed
hacking of 1.2 billion usernames and passwords belonging to more than 500
million email addresses, believed to be the "largest data breach known to
date".
Read: BBC News,
Listen: BBC Radio 5 Live 'Shelagh Fogarty' (from 1
hour 29 mins),
More: BBC World Service 'Tech Tent' (from 1 min 22 secs)
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