MFA uses two or more checkpoints to confirm a user's identity for accessing an account or system. This is more secure than relying on just a username and password combination, especially given how easy many passwords are to crack, and how many have found their way onto the dark web. Passwords are often basic and repeated, so once a password has been compromised, it can be used to get into many accounts. That's why it's so important to use strong and unique passwords for each one of your accounts.
Note that while 2FA and MFA are often used interchangeably, they aren't necessarily the same thing. 2FA uses two factors to verify a user's login, such as a password plus a security question or SMS code. With 2FA, both factors can something the user knows, like their password and a PIN.
MFA can still be compromised
While having MFA enabled on your accounts can make you feel secure, some MFA methods can be compromised almost as easily as your usernames and passwords.
The attack works as follows: Bad actors send you a message saying that one of your accounts—Google, for example—has been compromised, with a link to log in and lock it down. The link looks real, as does the page you land on, but it is actually a phishing link connected to a proxy server. The server forwards the credentials you enter to the real Google site, which triggers a legitimate MFA request (and if you've set up MFA on your account, there's no reason to believe this is suspicious). But when you enter the authentication code on the phishing site or approve the push notification, you've inadvertently given the hacker access to your account.
How to maximize MFA security
To get the most out of MFA, consider switching from factors like SMS codes and push notifications to an authentication method that is more resistant to phishing. The best option is MFA based on WebAuthn credentials (biometrics or passkeys) that are stored on your device hardware or a physical security key like Yubikey. Authentication works only on the real URL and on or in proximity to the device, so adversary-in-the-middle attacks are nearly impossible.
In addition to switching up your MFA method, you should also be wary of the usual phishing red flags. Like many phishing schemes, MFA attacks prey on the user's emotions or anxiety about their account being compromised and the sense of urgency to resolve the problem. Never click links in messages from unknown senders, and don't react to supposed security issues without checking their legitimacy first.
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