Dropbox has introduced optional two-factor authentication to its cloud-based storage service following a recent security incident.
The code can either be text-messaged to the user's phone or generated with a third-party mobile authenticator app.
As it is an optional feature, two-step verification is not switched on by default but can be activated in Dropbox's security menu.
An undisclosed number of Dropbox users had problems earlier this month when passwords stolen from a hacked third-party website were used to access their Dropbox accounts.
Dropbox urged users at the time to ensure they used unique passwords for account access; however, two-factor authentication gave users an extra layer of protection against such an attack.