FBI posters carry details of what the agency claims are Russian hackers who penetrated Yahoo, possibly for years. SAN FRANCISCO - Russian hackers working with Russian spies didn't crack Yahoo security all at once. US intelligence agencies have previously said they believe that Russian hackers were involved in those breaches, too. FOOL ME ONCE, FOOL ME TWICEHackers accessed user accounts by fooling Yahoo into thinking they had already signed in. THE OTHER BREACHThe 2014 breach was the second of two major breaches at Yahoo and involved at least 500 million user accounts.

Source: Bangkok Post March 16, 2017 18:22 UTC