A few hours ago Clef, the two-factor authentication plugin used by over 1 million WordPress sites, announced that they would shut down within 3 months.
This announcement has caught the WordPress community and many users by surprise. Clef has provided a transition guide for their users and Wordfence is one of the products they recommend as an alternative to Clef.
Regards,
Mark Maunder
Wordfence Founder & CEO
See Clef’s blog for more info:
https://blog.getclef.com/discontinuing-support-for-clef-6c89febef5f3#.nunoiagrt