What Is Two-Factor Authentication and Why Should You Use It?

Two-factor authentication (2FA) has become an increasingly common and highly recommended security feature for any online account containing sensitive personal or financial data. Requiring two forms of identification provides a critical extra layer of protection beyond just a password.

In this comprehensive guide, we‘ll explain everything you need to know about 2FA, how it defends against cybercrime, different authentication methods, proper usage, and tips for enabling it across your important accounts.

A Simple but Powerful Security Barrier

At its most basic level, two-factor authentication works by requiring two separate pieces of evidence that you are indeed the valid account holder:

  • Something you know – Typically a password or PIN number only you know.

  • Something you have – Usually a physical device like a mobile phone or security key in your possession.

By forcing hackers to need access to both your password and phone, for example, 2FA makes it exponentially harder for cybercriminals to break into your accounts.

While passwords alone are easily stolen through database breaches, phishing, or spyware, adding that second "something you have" factor creates a powerful extra barrier. Even advanced hacking groups find 2FA very difficult to bypass.

Some examples of two-factor authentication in action:

  • After entering your password to log into an online bank account, you receive a text message with a 6-digit code that you must also enter within 30 seconds to access your funds and personal data.

  • When logging into your work email from an unrecognized device, you are prompted to approve the login attempt on your smartphone‘s authenticator app. Only after clicking approve can you access your inbox.

  • To add a new payee for wire transfers in your investment account, you must enter your password AND insert your Yubikey physical security key into your computer‘s USB port.

While slightly more inconvenient than just entering a password, 2FA undeniably keeps your accounts exponentially more secure from thieves, hackers, and cybercriminals.

The Rising Threats That Make 2FA Essential

In our increasingly digital world, the threats to your personal data and accounts grow more sophisticated every year:

  • Password database breaches expose billions of login credentials on the dark web for criminals to leverage in brute force and account takeover attempts.

  • Phishing schemes use realistic fake login pages to trick unsuspecting users into handing over their passwords.

  • Keylogging malware records your keystrokes to steal passwords and other sensitive info.

  • SIM swapping allows hackers to hijack your phone number and intercept 2FA codes sent via text.

  • Credential stuffing uses compromised passwords from other sites to break into accounts through sheer guessing volume.

According to cybersecurity firm PurpleSec, over 90% of successful data breaches start with stolen login credentials. Two-factor authentication is one of the most effective ways to combat this leading attack vector.

How Different Two-Factor Authentication Methods Work

There are several different options for implementing 2FA, each with their own pros and cons:

SMS Text Verification

  • The user receives a text message containing a random 6-8 digit verification code.
  • Must be entered in addition to password when logging in.
  • Simple and convenient but vulnerable to SIM swapping attacks.

Authenticator Apps

  • Apps like Google Authenticator generate time-based verification codes.
  • Codes refresh every 30 seconds and can be used with multiple accounts.
  • Completely offline so more secure than SMS.

Security Keys

  • Physical devices like Yubikey that plug into USB ports.
  • Use cryptography to provide verification without codes.
  • Most secure 2FA method but can be expensive and less convenient.


  • Fingerprint, facial, or iris recognition to confirm a user‘s identity.
  • Convenient for users but requires compatible hardware.
  • Provides excellent security when properly implemented.

Email Verification

  • A code is emailed to the user‘s registered address during login.
  • More secure than SMS but still vulnerable to email account breaches.
  • Codes typically expire after a short period.

Backup Verification Codes

  • One-time codes provided when enabling 2FA as a fallback option.
  • Can be used to restore access if you lose your device.
  • Should be stored securely like any other password.

There is no perfect 2FA method that suits every user‘s needs and priorities. However, using any two-factor authentication is vastly superior to relying solely on passwords.

2FA Adoption Still Lags Despite Benefits

With cybercrime rising every year, technology leaders universally recommend widespread adoption of two-factor authentication. And yet, many internet users still do not take advantage of this simple security upgrade.

Some key 2FA usage statistics:

  • Only 59% of US adults report using 2FA in a 2021 Google/Harris Poll survey.
  • Use is increasing but 36% of millennials still do not use two-factor per a 2020 Mastercard study.
  • Over 50% of social media users don‘t secure accounts with 2FA according to SocialCatfish.com.
  • 1 in 3 Americans victimized by account takeovers did not have extra login protections enabled.

Why are so many people still avoiding this basic security measure? The leading obstacles include:

No awareness – Many users are simply unaware that 2FA options even exist for their accounts. Better education is key.

No incentives – Unlike passwords, there are limited prompts or requirements to enable two-factor authentication.

No urgency – If users have not fallen victim to a hack, they underestimate the risk. Out of sight, out of mind.

Hassle factor – An extra step, even minor, feels like a nuisance for users valuing convenience over security.

SMS concerns – Reliance on text messages for codes worries some users due to risks like SIM swapping attacks. Authenticator apps avoid this issue.

Misplaced concerns – Some users fear being locked out of accounts if they lose access to their second factor device. Backup codes provide a contingency however.

Cybersecurity experts stress that the minor hassle of 2FA is a small price to pay for vastly improved account security. And authenticator apps continue to make the process faster and simpler for users.

Real-World Examples Show Danger of Inaction

The potential consequences of not using two-factor authentication range from irreversible identity theft to major financial loss to permanent social media account hijacking.

Some examples of real victims from lack of 2FA protections:

  • A Minnesota man lost $23,000 from his bank account after criminals used stolen passwords and a weak "security question" process to bypass 2FA.

  • $5 million in cryptocurrency vanished from a digital wallet service that only used text messaging for 2FA, allowing SIM swapping.

  • Hackers seized control of several high-profile Twitter accounts including Elon Musk and Joe Biden by bypassing SMS-based two-factor authentication.

  • Ohio woman Jessica Allen sued Cash App after $2,500 was stolen when hackers bypassed its optional 2FA to access her account.

The potential financial losses, identity theft risks, and social media account hijackings from weak 2FA are simply not worth the minor hassle of proper multi-factor authentication.

Tips for Enabling 2FA on Major Accounts

Hopefully it is clear by now that using two-factor authentication is a vital security step for all your important online accounts. But you may be wondering how exactly to turn it on.

Activating 2FA is generally straightforward in your account settings for most major websites and apps. Here are tips for the most common ones:


  • Log into your Google account and go to Security settings.
  • Under "Signing in to Google," select 2-Step Verification.
  • Follow the prompts to enable verification by text message, phone prompt, or Authenticator app.


  • Click the arrow icon in the top right and choose Settings & Privacy.
  • Go to the Security and Login section in the left menu.
  • Click Set Up Two-Factor Authentication and follow the instructions.


  • Sign into your Microsoft account and choose Security.
  • Select More Security Options > Two-Step Verification.
  • Choose to verify with a code via the Microsoft Authenticator app or text message.


  • From your Account page, click Login & Security.
  • Go to Two-Step Verification Settings.
  • Follow the steps to enable 2FA via text or an authenticator app.


  • On your iPhone, iPad, or Mac, open the Settings app then tap your Apple ID name.
  • Choose Password & Security > Turn on Two-Factor Authentication.
  • Confirm with your device passcode or Touch/Face ID.

Online Banking

  • Log into your bank account site and locate Security or Account Settings.
  • Search for options like Two-Step Verification or Extra Security.
  • Opt to use text/SMS, email codes, or authentication apps like Duo.

Be sure to save your backup verification codes in a secure password manager any time you turn on 2FA. Treat these codes like passwords since they provide access to your accounts if your primary device is lost or stolen.

While not flawless, rigorously implementing two-factor authentication across your online accounts helps protect you against the skyrocketing threats of identity theft, financial fraud, and account hijacking by cybercriminals. The minor hassle is more than worth it!

Luis Masters

Written by Luis Masters

Luis Masters is a highly skilled expert in cybersecurity and data security. He possesses extensive experience and profound knowledge of the latest trends and technologies in these rapidly evolving fields. Masters is particularly renowned for his ability to develop robust security strategies and innovative solutions to protect against sophisticated cyber threats.

His expertise extends to areas such as risk management, network security, and the implementation of effective data protection measures. As a sought-after speaker and author, Masters regularly contributes valuable insights into the evolving landscape of digital security. His work plays a crucial role in helping organizations navigate the complex world of online threats and data privacy.