I conducted a search on this site for this product but didn't see much on it. What is this? A link to the site is below. https://duo.com/
If you trust them, anyone can put up a convincing and pretty web site. I dont know if i would put trust in them. Hopefully someone will chime in and have more to offer.
Looks like Facebook is using them for their new 2FA without a phone number thing https://www.facebook.com/notes/face...ebook-now-easier-to-set-up/10155341377090766/ Also various articles about them.. https://globenewswire.com/news-rele...king-from-Potentially-Unsecured-Networks.html
They provide factor authentification primarily in the business world. My employer uses Duo as an extra layer of security with the Cisco VPN we use to c onnect securely.
I guess Cisco is buying Duo. https://www.marketwatch.com/story/c...promises-235b-for-security-startup-2018-08-02