Azure Multi-Factor Authentication might be a bit more popular than CAcert. We know about 2 links to it since March 2021 and only 2 links to CAcert. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Cacert.org provides this (http://wiki.cacert.org/PgpSigning). However, their service is not working at the moment - and regardless, would like to know if there are any other similar services that anyone is aware of. Source: over 2 years ago
Now, I've written a couple little modules and released them. It's not really in my budget to purchase a paid signing certificate right now, though. However, I have an account in good standing at CAcert and could get a code signing certificate. Source: about 3 years ago
This is the answer, more detail: https://docs.microsoft.com/en-us/azure/active-directory/authentication/concept-mfa-howitworks. Source: about 2 years ago
Make sure that you back-up the active app-configuration, this way you have an easier way to recover; make sure you are allowed to verify using more than an authenticator, more here. Source: almost 3 years ago
Digicert - Encryption & Authentication
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
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Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
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Duo Security - Duo Security provides cloud-based two-factor authentication. Duo’s technology can be deployed to protect users, data, and applications from breaches, credential theft, and account takeover.