In 1601, William Shakespeare wrote a comedy called “Twelfth Night.” The story is about a pair of twins with identity issues. To illustrate that the characters share similar thoughts, Shakespeare wrote, “My purpose is, indeed, a horse of that color.” For many decades, a horse of the same color was analogous to similar thoughts or plans of action.

Jump to 1939, when MGM Studios adapted L. Frank Baum’s story of “The Wizard of Oz.” This new version of the tale uses a popular twist on Shakespeare’s colorful equine phrase. When Dorothy asks for admittance to Emerald City to see the Wizard, the gatekeeper demands identification. The Scarecrow points out that Dorothy has control of the ruby slippers given to her by the Good Witch of the North. The gatekeeper replies: “Well, bust my buttons! Why didn’t you say so in the first place? That’s a horse of a different color. Come on in!”

Certainly, this is one of the first cinematic examples of multifactor authentication (MFA) — utilizing something you know and something you have to authenticate and gain access.

We’re Not in Kansas Anymore

There are three factors that can be used to confirm a person’s identity:

  1. Something you have. This is a physical thing such as a bank card, USB stick or even a good old-fashioned physical key.
  2. Something you know. This is a secret piece of information that only the real person is supposed to know, which is why you should not share your password or personal information with anyone else.
  3. Something you are. We’re talking about biometrics now — fingerprints, iris scans, voice patterns or other physical characteristics.

It’s critical to make each factor as strong as possible. During the February 2017 Cloudflare breach, for example, chunks of uninitialized memory were accidentally returned into innocent streams of HTML heading to browsers and then being caught up in server logs.

These chunks contained all sorts of data, including user IDs, passwords and, in some cases, the values used to perform two-factor authentication (2FA). Incidents like this should remind us to change passwords often, make them difficult to guess and realize that not even MFA can provide foolproof protection from accidental information exposures.

Multifactor Authentication Frameworks and Standards

There are several frameworks, standards and guidelines that can help security teams protect their critical systems with MFA. The Payment Card Industry Data Security Standard (PCI DSS), for example, requires MFA for remote access that originates from outside the network to the cardholder data environment (CDE). It also demands MFA for all administrative access to the cardholder data, even if the user is within the trusted network.

The Federal Financial Institutions Examination Council (FFIEC) guidance on authentication does not necessarily mandate MFA. It does, however, specify that single-factor authentication is inadequate on its own. At level 3 and above, the National Institute of Standards and Technology (NIST) data classification standards require multifactor authentication and control of the factor items, whether they are tokens, soft tokens or other identifiers.

Many large tech companies such as PayPal, Apple and Google have dedicated support pages to help you secure your identity with MFA. Other resources, such as Two Factor Auth, help security teams and consumers keep track of which online services support MFA.

We are in an arms race with very sophisticated cybercriminals from all around the world. Multifactor authentication is our latest defense, but it certainly won’t be our last attempt at keeping our information to ourselves.

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