Hackers have a treasure trove of data with the Yahoo breach

The massive breach at Yahoo means that a treasure trove of stolen data is in the hands of hackers -- putting millions of internet users at risk.

At least half a billion Yahoo accounts have been affected in one of the biggest data breaches in history. Information including names, email addresses, telephone numbers and hashed passwords may have been stolen.

Yahoo has blamed the attack on a "state-sponsored actor," but it's far from clear who hacked the internet company and how the culprits pulled off the attack.

Blaming it on a state-sponsored actor, however, indicates that Yahoo may have found evidence that the hackers were targeting the company over a long period of time, said Vitali Kremez, a cybercrime analyst at security firm Flashpoint.

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