Clef support has been discontinued
Clef stopped working on July 7, 2017 -- we recommend transitioning to Jetpack’s two-factor authentication as soon as possible.
"With Clef, the often painful process of logging into a site feels, admittedly, a little bit magical." Nicole Perlroth, Cybersecurity & Privacy, NYTimes
"Clef isn’t just another nice feature, it is a critical part of our security." Ray Youseff, CEO, Paxful
"Clef's security to effort ratio is the best I've ever come across for logging in." Joey Krug, Lead Developer, Augur
"Our integration with Clef allows us to provide best in class security without compromising ease of use." Arthur Hayes, CEO, Bitmex