Hackers Could Have Stolen Over 1 Billion Yahoo Accounts

The actual tally of stolen user accounts from the hack Yahoo experienced could be much larger than 500 million, according to a former Yahoo executive familiar with its security practices. The former Yahoo insider says the architecture of Yahoo’s back-end systems is organized in such a way that the type of breach that was reported would have exposed a much larger group of user account information.

https://developers.slashdot.org/story/16/10/01/0549241/yahoo-insiders-believe-hackers-could-have-stolen-over-1-billion-accounts

http://www.businessinsider.com/yahoo-insider-hacking-2016-9