What Is Two-Factor Authentication (2FA Security) ?

Passwords have been used to secure facilities and information since ancient times. The Greeks and Romans used password protection in their militaries to ensure that approaching troops could be trusted, and even today, the U.S. military uses call-and-response passwords to defend classified areas in hostile environments.

However, throughout history, passwords have proven to be vulnerable to several external threats. Security professionals have long sought a better way to let good guys in and keep bad guys out. So, how secure is two-factor authentication (2FA)?

How Does Two-Factor Authentication Work

Two-Factor Authentication is an electronic access-point management and authentication system in which a computer user receives access to a particular network, platform, or application only after providing two independent sources of identifying evidence to the authentication mechanism. It’s also known as 2-Step Verification.

Oftentimes, 2FA requires that a user provide both a password and a physical token, such as a debit card, or a passcode or QR code that has been generated by a third-party security system and sent to a user’s mobile device. Increasingly, authentication apps or authenticator apps are used to generate verification codes, further strengthening the security of the system by reducing reliance on SMS.

This method of authentication is now standard among most organizations that maintain databases containing sensitive or classified information, such as:

• Hospitals
• Research institutes
• Government organizations. 

They’re attracted to the additional security that an extra layer of authentication affords them, as well as the relatively low cost of providing physical tokens or utilizing third-party two-factor authentication systems.

Benefits of Two-Factor Authentication

2FA provides 5 key security benefits as listed below:

1. Enhanced Security

Reduces the risk of unauthorized account access. Even if your password is compromised, attackers still need the second factor.

1. Protection Against Common Attacks

2FA helps defend against password-based attacks like phishing, credential stuffing, and brute force attacks, since passwords alone aren’t sufficient for access.

1. Reduced Impact of Data Breaches

2FA-protected accounts remain secure during data breaches because the second authentication factor wasn’t compromised.

1. Compliance Requirements

Many industries and regulations (like PCI DSS, HIPAA, and SOX) require or strongly recommend 2FA for accessing sensitive systems and data.

1. Identity Verification

2FA provides stronger assurance that the person accessing an account is actually the legitimate account owner.

Common 2FA Examples by Security Level

Not all 2FA methods provide the same level of security. While any form of 2FA is better than password-only authentication, some methods are more vulnerable to attacks than others. The table below ranks common 2FA methods from least to most secure.

Is 2FA Safe?

Despite its advantages, 2FA is far from perfect. Many people find 2FA annoying because it takes extra steps to log in. When users get frustrated, they sometimes find ways around it, making their accounts less safe. The most obvious method for a hacker to crack a 2FA system is to steal a physical token or cell phone, which can be done completely virtually. SIM cloning can reroute verification codes sent via SMS from a target’s cell phone to a hacker’s device, as happened to former Twitter CEO Jack Dorsey in 2019.

However, using a time-based one-time password (TOTP) algorithm, such as the multi-application system that SecurityScorecard has implemented, can be an effective defense mechanism for this type of scheme.

Social engineering attacks are also common and can take multiple forms. Criminals can call users and pose as banks or trusted agents and ask to confirm the passcode that was sent to them. They can also provide links to spoofed websites through phishing attacks. Another way is to pose as users and contact cell phone carriers in an attempt to carry out a SIM cloning attack.

Especially concerning is the fact that, for the most part, 2FA attacks do not require a great deal of skill or effort from hackers. Novices often carry out these kinds of attacks, so organized crime syndicates and nation-states with considerable resources pose an even more serious threat.

How to Avoid 2FA Vulnerabilities

Problems with Two-Factor Authentication primarily stem from their dependency on device authentication rather than true identity authentication. Many cybersecurity experts now believe that biometric authentication could be the answer.

Biometric authentication utilizes sensors and body measurements to compare the physical characteristics of requesting parties with the verified characteristics of known users. Anyone who has ever used a fingerprint or facial scan to access their cell phone has used this technology.

The beauty of this security system is its ability to link access privileges to real people rather than devices and passwords. With biometrics, there are no assumptions about ownership and knowledge; there is only human identity. 

Current iterations of biometric technology have been shown to have vulnerabilities, such as difficulty distinguishing between two-dimensional images and three-dimensional objects, but the industry has kept pace and fielded technologies to counter these issues. 

Numerous other multi-factor authentication (MFA) systems are also in development, hoping to make complying with stringent security standards less onerous for users. One method, for example, compares the ambient noise near a user’s cell phone with the ambient noise of the device requesting access to ensure that the validated user is in proximity to the device being accessed.

Novel implementations of MFA and biometric technologies will be the future of authentication, helping individuals and companies everywhere stay one step ahead of criminals and hackers.

Privacy Challenges with Biometric Authentication

Biometric authentication improves security by using unique physical traits, but it also raises serious privacy concerns. Unlike passwords that can be changed if compromised, biometric data like fingerprints and facial scans is permanent and irreplaceable. When stored in databases, this sensitive biological information becomes a high-value target for hackers, and any breach can have lifelong consequences for users. Companies implementing biometric 2FA must invest in strong encryption, secure storage, and clear privacy policies to address these risks while maintaining user trust.

How Can SecurityScorecard Help?

Companies are only as strong as their weakest link, so they must have a strong hold on their security posture. Fortunately, SecurityScorecard’s security ratings platform gives you an outside-in view of your organization’s cybersecurity posture. We continuously scan your entire IT ecosystem, including vendors, across ten risk factor categories, including:

• IP reputation
• DNS health
• Network security
• Web application security
• Endpoint security
• Patching cadence
• Hacker chatter
• Information leakage
• Social engineering.

Our easy-to-read A-F rating scale gives you at-a-glance visibility into your controls’ effectiveness. With our platform, you can drill down into each risk factor category to gain detailed information about weaknesses, helping your security team prioritize remediation activities for enhanced security.

SecurityScorecard is used by 70% of Fortune 1000 organizations. See what we can do for you on a demo call.