Multi-factor authentication gets recommended constantly in cyber security advice, often without much explanation of what it actually does. It's worth understanding, because it's genuinely one of the highest-impact, lowest-effort security measures available to any business.
Why a Password Alone Isn't Enough
Passwords get compromised more often than most people assume — through phishing emails, data breaches at other companies (where people reuse passwords), or simple guessing of weak ones. Once someone has a valid username and password, a system that relies on that alone has no way of knowing the person logging in isn't who they claim to be.
What MFA Actually Adds
Multi-factor authentication requires a second piece of proof beyond the password — typically a code from an authenticator app, a prompt on a registered phone, or a physical security key. Even if someone has stolen your password, they still can't get in without also having access to that second factor, which they almost certainly don't.
What It Specifically Protects Against
MFA is most effective against exactly the kind of attack that's most common against small businesses: credential theft through phishing, and reused passwords exposed in unrelated data breaches. It significantly reduces the practical risk of an attacker gaining access to email, Microsoft 365, or other business systems using a stolen password alone.
Why It's Not Just an Inconvenience
The most common objection to MFA is that it adds friction — an extra step every time someone logs in. Modern implementations reduce that considerably: most systems can remember a trusted device for a period, so the prompt only appears occasionally rather than every single login. The small amount of friction is a reasonable trade against the very real risk it closes off.
What This Looks Like at REONEX
REONEX sets up and enforces MFA across Microsoft 365 and other business systems as a standard part of cyber security, configured properly rather than left as an optional setting nobody turns on. See Cyber Security for Leeds Businesses for more on how this fits into a wider Microsoft 365 security setup.