We don't know whether everyone heard about probably the biggest hacking attack in the history of Internet - personal data of half a billion users were stolen by  cybercriminals.

Personal data of half a billion users in the hands of cybercriminals. It is probably the biggest hacking attack in the history of Internet. 

After the period of two years the Yahoo portal admitted that they had become victims of the attack by cybercriminals. As a result of this attack personal data of 500 million users fell into the wrong hands. Yahoo informed the users about this attack by e-mail, advising to the change the password. 

According to Yahoo, the secret service of foreign country is suspected of the attack but we don't have any particular information which country is taken into consideration. The fact that passwords of users' accounts credit card data were not stolen is a little bit of consolation. 

What kind of data was stolen? Full name, mail addresses along with phones numbers, dates of the birthday, hashes of passwords (allegedly the majority is bcrypt) or supporting questions and replies for recovering passwords. On the basis of these data, it is possible "to get a fix on and test the identity of the user". 

What's interesting, Verizon which in July bought the portal for almost 5 billion dollars did not have a clue about this practice. 

The question remains. Why such information is revealed 2 years after the hacking attack?