
twofactorauth.io
Two Factor Authentication for Ruby and RailsKeep your site safe. TwoFactorAuth for Ruby and Rails. You know your users reuse passwords. Their account on your site is only as safe as the least-secure site they've ever reused their password on — so, not very safe at all. On top of that, dedicated attackers phish passwords by tricking users into visiting their counterfeit copies of your site. Are your users technical enough to recognize tiny differences in URLs and SSL settings? GMail, PayPal, and Salesforce.com already support it. U2F is young and g...
http://www.twofactorauth.io/