3 billion Yahoo accounts affected by 2013 breach
October 5, 2017
On 14 December 2016 Yahoo revealed that a jaw-dropping billion accounts had been affected by a data breach in August 2013. The disclosure arrived hot on the heels of a 22 September admission that 500 million Yahoo accounts had been compromised in a different attack in late 2014.
The announcements changed what we mean by “big”, when we talk about big data leaks. They seemed preposterous and unwieldy, and at the time we marvelled at the scale and wondered – how on earth did it take them three years to notice?
What we didn’t know, didn’t expect, was that Yahoo had badly low-balled the number of affected accounts.