In a statement released on Wednesday, Yahoo disclosed that it was hit by a hacking attack in August 2013, in which more than 1 billion user accounts were affected. The company also said that the hack also likely affected the government employee data.
The disclosure of the August 2013 hack by Yahoo is the second major data breach to have been disclosed by the company after its September revelation of a widespread hack which took place in 2014, and affected nearly 500 million accounts.
According to the details shared by Yahoo on Wednesday, the data which was compromised in the August 2013 hack included users' names, dates of birth, encrypted passwords, email addresses, and telephone numbers. In addition, the stolen data also included a few security questions and answers, some of which were not encrypted.
In disclosing the August 2013 hacking attack, Yahoo said in its statement that the potentially affected users are being notified by the company which has also put some necessary measures in place -- including requiring a change of passwords by the users -- to ensure the security of their accounts.
Yahoo further added that it has also "invalidated unencrypted security questions and answers so that they cannot be used to access an account."