Understanding Two-Factor Authentication for Aussies: Benefits and Best Practices

In an age where online security is paramount and scams are everywhere, understanding and implementing Two-Factor Authentication (2FA) can significantly enhance your digital protection.

This blog will explore what 2FA is, how it works, and the strongest to weakest methods for securing your online accounts.

What is Two-Factor Authentication?

Two-Factor Authentication (2FA) is a security process that requires two different authentication factors to verify your identity.

This adds an extra layer of protection beyond just a password.

By combining something you know (like a password) with something you have (like a phone) or something you are (like a fingerprint), 2FA makes it significantly harder for unauthorized individuals to access your accounts.

In other words, to get in to your account a hacker would have to have your password and your fingerprint, your mobile phone, or whatever other thing you set up as your 2FA method.

How Does Two-Factor Authentication Work?

2FA typically works by requiring two or more of the following types of information:

1. Something You Know: This is usually a password or PIN.
2. Something You Have: This could be a smartphone, hardware token, or security key.
3. Something You Are: This involves biometrics like fingerprints, facial recognition, or voice recognition.

When you log into an account with 2FA enabled, you will first enter your password. Then, you will be prompted to provide the second form of authentication, such as a code sent to your phone or a fingerprint scan.

Ranking 2FA Methods from Strongest to Weakest

1. Hardware Security Keys

Security: 9.5/10
Convenience: 7/10

Hardware security keys are physical devices that connect to your computer or smartphone. They provide the highest level of security because they are almost impossible to hack remotely. However, they can be less convenient as you need to carry the device with you.

Chances are you haven’t heard of these. That’s likely because security keys cost money unlike the other methods on this list.

Also note that if you lose your security key you will need a third form of 2FA to get back into your account (this could be a second key – but note that every key is unique so you’ll have to add them individually).

2. Biometric Authentication (Fingerprint, Face ID)

Security: 8.5/10
Convenience: 8/10

Biometric authentication uses unique physical characteristics, such as fingerprints or facial recognition. It is highly secure and convenient but can sometimes fail due to environmental factors or changes in appearance.

3. Authenticator Apps (Google Authenticator, Authy)

Security: 8/10
Convenience: 7/10

Authenticator apps generate time-based one-time passwords (TOTPs) that change every 30 seconds. They offer a good balance of security and convenience, though they rely on having your smartphone available.

Note that if you lose your phone and don’t have a second method of 2FA it can be very difficult to get back into your account.

4. SMS-Based Codes

Security: 6/10
Convenience: 7/10

SMS-based 2FA sends a code to your phone via text message. While convenient, this method is less secure due to vulnerabilities like SIM swapping and interception of SMS messages.

SMS verification is also difficult if you plan on accessing the account from overseas.

5. Email-Based Codes

Security: 5/10
Convenience: 6/10

Email-based 2FA sends a code to your registered email address. It offers similar convenience to SMS, but it is less secure due to potential email account breaches.

6. Backup Codes

Security: 5/10
Convenience: 6/10

Backup codes are a set of one-time-use codes that you can use if you lose access to your primary 2FA method. They are less secure because they can be lost or stolen, but they are useful as a last resort.

The security of backup codes is hard to gauge as some logins give you ten eight digit codes, whereas others give you a single twenty digit code.

Choosing Your 2FA Methods

2FA is only as strong as it’s weakest link. You can have biometrically unlocked security keys but that account also allows email 2FA your account is only as secure as email 2FA.

In other words: Make sure that your weakest method of 2FA is as strong as you’re comfortable with.

What works for you?

• If you travel internationally, SMS verification might be a challenge.
• If you tend to misplace things, don’t rely on your 2FA apps and security keys (if you do, have several backups).
• Choose the types of 2FA that you’re comfortable with, that way you will use them across all of your logins.

Remember: Any 2FA is significantly better than none.

Conclusion

Implementing Two-Factor Authentication is a crucial step in securing your online accounts.

By understanding the various methods available and their relative strengths and weaknesses, you can make informed decisions about which 2FA methods to use.

For the best protection, consider using hardware security keys or biometric authentication, and always keep your backup methods available.

Staying vigilant and proactive with your online security measures can help protect you from cyber threats and keep your personal information safe.

To stay safe, read our blog on the other simple things you can do to stay safe online.