Proof-of-concept U2F Authentication modules for OutSystems
Specification and more details about the FIDO Universal 2nd Factor authentication mechanism can be found at https://fidoalliance.org or here https://developers.yubico.com/U2F/
Extension is based on this implementation by Hans Wolff https://github.com/hanswolff/fido-u2f-net
Tested (on a computer) with Google Chrome and Firefox + U2F Plugin, might work on Safari too with this plugin. Didn't test on mobile devices.
Tested with Yubikey 4 and Feitian K5, but any FIDO compatible/certified device should work.