After celebrity iCloud accounts were compromised and private photos leaked online, Apple has expanded its use of two-factor authentication to its iCloud backup service.
Although the company said iCloud security was not breached, within days of the leaks Apple announced it would take additional steps to keep hackers out of users' accounts.
In a statement Apple said that photos of celebrities were obtained in a "carefully targeted attack on user names, passwords and security questions".
Security commentators called for Apple to expand its two-factor authentication facility to cover all services, to prevent hackers from using stolen credentials or automated tools to access accounts.
The latest authentication system will protect users against hackers using automated tools. Despite calls for Apple to make two-factor authentication mandatory, or at least enable it as the default, the extra security feature remains optional - allowing users to turn it on or off.
After the photo leaks, Apple chief executive Tim Cook said the company planned to "aggressively encourage" people to use two-factor authentication and stronger passwords.
Cook has acknowledged that Apple could have done more to prevent the attack on the accounts of celebrities.
He said: "When I step back from this terrible scenario that happened and say what more could we have done, I think about the awareness piece.
"I think we have a responsibility to ratchet that up. That's not really an engineering thing."
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