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Multi-factor authentication or MFA requires multiple factors to authenticate a user. Two-factor authentication (2FA) is an MFA with two factors. There is no real limit on how many factors we can add but it’s not practical for a user to use many factors as it hurts usability of the application if the login process is too long and complicated. Adding a second factor is usually enough to stop the brute-force and dictionary attacks.

Bharat Dwarkani shared on Nov 24, 2019
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If you want to add more security, you must ask for a second authentication. That's what is called a two-factor authentication (2FA). Commonly, you have a device (specialized or a smartphone) that give you a number to write down on the computer after you entered your password. So, even if your password is compromised, an attacker cannot access your account.

Bharat Dwarkani shared on Aug 18, 2019
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This article shows how Fido2 WebAuthn could be used as 2FA and integrated into an ASP.NET Core Identity application. The Fido2 WebAuthn is implemented using the fido2-net-lib Nuget package, and demo code created by Anders Åberg. The application is implemented using ASP.NET Core 3.0 with Identity.

Bharat Dwarkani shared on Aug 18, 2019
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damienbod.com
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