What is MFA? And why is it Important?

The Importance of Multi-Factor Authentication for Business Security

As cyber crime continues to become more sophisticated, protecting your online accounts and sensitive data has become an essential part of both personal and business cyber security practices.  

Two-Factor Authentication (2FA) and Multi-Factor Authentication (MFA) are two widely used methods of enhancing your online security. While these terms are sometimes used interchangeably, they have differing meanings and implementations when it comes to your security practices. Understanding their differences and the vulnerabilities they address is essential for individuals and businesses aiming to strengthen their security. So lets look at these in more detail. 

 

What is Two-Factor Authentication (2FA)?

Two-Factor Authentication, commonly abbreviated as 2FA, is a security protocol that requires users to present two separate forms of identification for account access. This usually comprises something you know (such as a username and password) and something you have (like a mobile device which has an app or can display/receive an authentication code or request), making it considerably more challenging for malevolent actors to gain unauthorised entry to your accounts.

 

What is Multi-Factor Authentication (MFA)?

Taking it a step further is Multi-Factor Authentication, or MFA. Unlike 2FA, which demands only two verification elements, MFA may require two or more. These elements come from various categories:

Something you know:

Knowledge-based forms like username & passwords or PINs.

Something you have:

Possession-based elements like a mobile device, hardware tokens or smart cards.

Something you are:

Inherence-based elements, often biometrics like fingerprints or facial scans.

MFA’s added complexity and requirement to have multiple independent factors to authenticate your account provides a higher level of security. Additionally, MFA can often be tailored to specific needs of your business by combining as many factors as necessary to mitigate risks, including App’s and Hardware Keys specifically tied to your business accounts. 

 

Types of Two-Factor and Multi-Factor Authentication

Knowledge-based AuthenticationKnowledge-based Authentication

Passwords:

Combined with an email address or username,Passwordsare a long-time staple in online account security; however, passwords are vulnerable to brute-force attacks, and social engineering tactics and can be the subject of data breaches and leaks on the dark web which could grant malicious threat actors easy access to your online accounts.

PINs:

Personal Identification Numbers are often simpler but should be used either as a backup or in conjunction with other methods for optimal security.

Possession-based Authentication

Hardware Tokens:

These are physical devices that generate one-time-use authentication codes or contain unique cryptographic keys that must be plugged into your Computer or Mobile Device. They are considered highly secure but can be awkward to carry around or remember to keep in your possession.

Smart Cards:

These cards have an embedded chip containing cryptographic keys and are usually used in corporate settings with a hardware reader. The disadvantage to tools such as these is that you require both your card and reader to access your accounts and can fall to the same faults as hardware tokens if you do not have one or both of these in your possession.

Inherence-based Authentication

Biometrics:

Many Devices, Apps or Accounts may require uniquely personal verification of your identity through biometric data such as; fingerprints, facial scans, and retina scans. These offer a unique and highly secure form of verification however, they require the right technology to be available on the user device, such as Ultrasonic or Depth Sensing Sensors to identify a real face or fingerprint from an image of one.

Voice Recognition:

This Technology has evolved a lot, from previously requiring almost exact vocal matches to now identifying the unique vocal patterns and inclinations for secure authentication and being able to identify a real voice from a recording, although this method is less common especially as AI Voice Replication has improved to the point where it is almost indistinguishable from a real human voice.

Temporary Codes

Software Tokens:

These are the most common form of 2FA/MFA verification where temporary codes are generated by dedicated mobile apps like MicrosoftGoogle Authenticator, Authy, or Password Managers such as MyGlue, 1Password and more, offering convenience and a higher level of security than SMS. The challenge of singular Authenticator apps is that they require access to a single device, Password Managers overcome this by encrypting and synchronising these tokens across all points of secure access. Similarly, these Password Managers often require a heightened level of security such as Encryption Keys, Passwords and Biometric Authentication to gain access to them.

SMS Verification:

A temporary code is sent via text message to a mobile number/device.

Other Authentication Methods

Secondary Device/App Approval:

Some account providers, such as Apple or Google, may require authentication from another device or app that you use within their ecosystem.

App Approval:

Within a business environment you may be required to authorise access to your accounts (or devices) through App Approval. Services such as Watchguard or Cisco Duo will send prompts to an app on authorised devices that must be manually accepted. These often provide details of the sign-in attempt and the ability to decline access and add Biometric Approval.

 

The Importance of 2FA/MFA in Business Security

Implementing Two-Factor or Multi-Factor Authentication in a business environment offers several advantages:

Enhanced Security:

By adding an additional layer of verification, businesses can significantly reduce the risk of unauthorised access to sensitive data as a result of a data breach.

Compliance:

Many regulations, such as GDPR (General Data Protection Regulation) in Europe or HIPAA in the United States, require enhanced security measures like MFA.

Reduced Fraud:

2FA and MFA are instrumental in reducing instances of fraud such as identity theft or financial fraud, thereby protecting both the company and the clients.

User Accountability:

With MFA, businesses can more accurately track user activities, enhancing accountability among employees.

Customer Confidence:

Knowing that extra measures are in place to protect their data can substantially boost customer trust and brand reputation.

 

The Weakness of SMS-Based 2FA and MFA 

SMS-based authentication, often used as the “something you have” factor, has gained popularity for its simplicity, being used by social media platforms, online shopping, mobile/cellular networks and even by banks. However, it is increasingly regarded as the most insecure form of 2FA due to a variety of vulnerabilities that can be exploited by attackers. 

SIM Swapping Attacks

SIM swapping is a method where attackers convince a mobile/cellular carrier to transfer a victim’s phone number to a new SIM card controlled by the attacker. Once successful, the attacker can intercept SMS messages, including one-time passcodes (OTPs), to gain access to user accounts. 

Intercepting SMS Messages

SMS messages can be intercepted through vulnerabilities in mobile/cellular networks, such as the widely used SS7 protocol (See this video from YouTuber Veritasium which goes into this in more detail). Attackers exploiting these weaknesses can intercept OTPs sent via SMS without needing direct access to the victim’s phone. 

Phishing Attacks

Phishing attacks, either via call, email or SMS, often trick users into providing one-time passcodes sent via SMS into fraudulent websites as long as they are provided within the limited validation period of the code. Since SMS offers no additional validation of the recipient’s identity (other than being the recipient of the code), attackers can exploit it to bypass 2FA protections. 

Device Theft

If an attacker gains physical access to an unlocked phone, they may also gain access to SMS-based OTPs, also undermining the security provided by this method. 

 

Key Differences Between 2FA and MFA 

Aspect	2FA	MFA
Definition	Requires exactly two authentication factors.	Requires multiple authentication factors.
Complexity	Simpler to implement and use.	Offers greater customisation and complexity.
Security Level	Provides robust security but less than MFA.	Higher security due to additional layers.
Use Cases	Common for personal accounts like email, social media and online shopping.	Favoured by businesses looking to secure access sensitive data or financial data (such as banks).

 

Why Choose MFA Over 2FA? 

While 2FA significantly reduces the likelihood of account compromise, MFA offers an enhanced security posture, particularly for businesses handling sensitive or regulated data, or looking to secure access to sensitive business data such as a Customer/Content Management Solution, or cloud file storage such as Sharepoint, OneDrive, and more, ensuring only authorised personnel gain access even if credentials are stolen. 

MFA’s flexibility allows businesses to mix, match and layer authentication methods, making it harder for attackers to exploit vulnerabilities. It is especially effective when combined with adaptive authentication, where the system evaluates contextual factors like geographic location, timed geographic location (where a device logged on in one country cannot also be signed in in another country in s short period of time) or device integrity (such as if it has up to date software and security patches) before granting access. 

 

How can TwentyFour help secure your accounts?

Two-Factor and Multi-Factor Authentication are not just technical jargon but essential practices for securing your business accounts. We can assist your business in setting up multi-factor authentication tools to secure your online accounts, business devices and even access to servers.

Contact us to find out how we can help you to improve your business online security through tools such as Password Policy Management, User Training, Multi-Factor Authentication, Single Sign On, Dark Web Monitoring and much more.

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