Security experts: 'No one should have faith in Yahoo at this point'

Yahoo 'did not take security seriously enough', failing to prevent a hack which exposed the data of 1 billion users

Experts have attacked Yahoo's weak security after the revelation it suffered a hack in 2013, which exposed the personal data of 1 billion users, just months after revealing a 500-million-user data breach from 2014.

The hack saw the potential theft of login details, personal details and any confidential or sensitive information contained within email correspondences. Yahoo provided the email services for BT and Sky customers, as well as other services.