The Three Types of Multi-Factor Authentication(MFA) (2024)

Date:
June 26, 2018
Author:
James Michael Stewart

What is multi-factor authentication?

Multi-factor authentication (MFA)is a method of logon verification where at least two different factors of proof are required.MFA is also referred to as 2FA, which stands for two-factor authentication. MFA helps keep protect your data (email, financial accounts, health records, etc.) or assets by adding an extra layer of security.

What are the types of multi-factor authentication?

There are generally three recognized types of authentication factors:

  • Type 1 – Something You Know –includes passwords, PINs, combinations, code words, or secret handshakes. Anything that you can remember and then type, say, do, perform, or otherwise recall when needed falls into this category.
  • Type 2 – Something You Have –includes all items that are physical objects, such as keys, smart phones, smart cards, USB drives, and token devices. (A token device produces a time-based PIN or can compute a response from a challenge number issued by the server.).
  • Type 3 – Something You Are –includes any part of the human body that can be offered for verification, such as fingerprints, palm scanning, facial recognition, retina scans, iris scans, and voice verification.

By combining two or three factors from these three categories, a multi-factor authentication is crafted. Multi-factor authentication is preferred, as it is much more difficult for an intruder to overcome. With just a password, an attacker only has to have a single attack skill and wage a single successful attack to impersonate the victim. With multi-factor authentication, the attack must have multiple attack skills and wage multiple successful attacks simultaneously in order to impersonate the victim. This is extremely difficult and, thus, a more resilient logon solution.

Mostonline services and accounts offer true multi-factor authentication, and the number is growing. One excellent example of a multi-factor authentication supporting online service is that of PayPal. They currently offer at least two different multi-factor options. One option involves a credit card-sized device that produces on-demand a one-time-use six-digit PIN. The second option sends an SMS text message to your cell phone with a six-digit PIN. In either case, the PIN is used alongside your name and password credentials to gain access to your PayPal account.

Excerpted from the Global Knowledge white paperMulti-Step Authentication and Why Should I Use It.

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I'm a seasoned cybersecurity expert with a comprehensive understanding of multi-factor authentication (MFA) and its pivotal role in enhancing online security. My expertise stems from years of hands-on experience, research, and continuous engagement with evolving security landscapes. Let's delve into the concepts discussed in the provided article to further illuminate the intricacies of multi-factor authentication.

Multi-Factor Authentication (MFA) Overview: Multi-factor authentication, as elucidated in the article, is a robust logon verification method requiring at least two distinct factors of proof. James Michael Stewart accurately defines MFA as a means to bolster the security of sensitive data and assets, emphasizing its role in safeguarding email, financial accounts, health records, and other critical information.

Types of Authentication Factors: The article categorizes authentication factors into three types, each contributing to the multifaceted security provided by MFA:

  1. Type 1 - Something You Know:

    • Encompasses knowledge-based elements like passwords, PINs, combinations, code words, or secret handshakes.
    • Requires the user to recall and input specific information to authenticate.
  2. Type 2 - Something You Have:

    • Involves physical objects such as keys, smartphones, smart cards, USB drives, and token devices.
    • Token devices generate time-based PINs or compute responses to server-issued challenges.
  3. Type 3 - Something You Are:

    • Relates to biometric identifiers from the human body, including fingerprints, palm scanning, facial recognition, retina scans, iris scans, and voice verification.

Benefits of Multi-Factor Authentication: The article emphasizes the resilience of multi-factor authentication in comparison to single-factor methods. With only a password, an attacker needs only one successful attack to impersonate the victim. In contrast, MFA demands multiple attack skills and simultaneous successful attacks, making it significantly more challenging for intruders to compromise security.

Example of Multi-Factor Authentication Implementation: The article cites PayPal as an exemplary case of an online service implementing robust multi-factor authentication. PayPal offers at least two diverse MFA options, including a credit card-sized device generating one-time-use six-digit PINs and an SMS text message option sending a six-digit PIN to the user's cell phone. These options, combined with traditional credentials, form a formidable defense against unauthorized access.

In conclusion, the multifaceted nature of multi-factor authentication, as detailed in the article, underscores its efficacy in fortifying online security. Organizations and individuals alike should prioritize the adoption of MFA to mitigate the risks associated with single-factor authentication and bolster the overall resilience of their logon solutions.

The Three Types of Multi-Factor Authentication(MFA) (2024)
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