What Is Two Factor Authentication and Why Is It Important?

“Two-step verification,” “dual-factor authentication,” and “two-factor authentication” are all terms for the same security measure, which requires the user to provide two different forms of identification.

Both the user’s security credentials and the resources to which they have access are safeguarded by using two-factor authentication. Two-factor authentication is more secure than single-factor authentication techniques, in which the user provides just one factor (often a password or PIN).

To use 2FA, a user must supply a password and a second, unique element, such as a security token or biometric scan. With 2FA, even if a user’s password is stolen, that information alone won’t be enough to access their devices or account.

Two-factor authentication has been used for a long time to control who can access vital infrastructure and information. Two-factor authentication (2FA) is on the rise amongst online businesses to protect customers’ credentials from being stolen by hackers who get access to a credential database.

What Is 2FA and Why Is It Important: Authentication Factors

Multiple authentication methods are possible and often used to ensure a user’s authenticity. While one-factor authentication relies on knowledge factors like a password, 2FA uses a combination of a knowledge factor and a possession factor or an inherence factor.

The 2FA systems use the following authentication factors:

  • A knowledge factor is an information only the user knows, like a password or personal identification number (PIN).
  • Possession factors, such as an ID card, security token, phone, smartphone, or smartphone app, validate authentication requests when the person is physically present.
  • A biometric factor is any characteristic of a person’s physical appearance that cannot be fabricated by technology. A fingerprint scanner’s verification of a person’s fingerprints is an example of a physical characteristic that could be added. It’s common for inherence variables to use behavioral biometrics like typing dynamics and speech patterns, in addition to facial and vocal recognition.
  • The source of an authentication attempt frequently determines the location factor. To do this, you can utilize the user’s IP address or the location services on their smartphone to determine the approximate physical position of the user making the authentication request, or you can limit authentication requests to devices within a particular geographic area.

Access to the system is denied outside the predetermined time window, as user authentication is time-based. Multi-factor authentication (sometimes abbreviated to “MFA”) uses two or more different credentials to verify a user’s identity, providing an extra layer of security beyond the standard 2FA.



How Does 2FA Work?

The process of enabling two-factor authentication differs based on the application or provider. But, two-factor authentication procedures follow the same basic procedure:

  • The user must register before using the Software or browsing the website.
  • This usually consists of a login name and password the user is already familiar with. The server will recognize a client’s connection and identity the moment it is made.
  • For actions that don’t require passwords, the system generates a unique key for the user. The authentication tool manages the key, and the site’s server checks its validity.
  • Once the primary login is complete, the user will be requested to begin the secondary login procedure, which might involve various methods (such as a fingerprint scan, security token, ID card, phone, or another smartphone) to establish the user’s identity further. This is the possession or inheritance part.

The user must enter the one-time code they received in Step 4. After the user’s identity and other credentials have been verified, they are authenticated and given access to the system.

The Elements of the 2FA

Multi-factor authentication (MFA) is 2FA. Technically, it is used whenever two different authentication factors must be provided before gaining access to a resource. Using two factors that are both in the same category, however, does not constitute Two-Factor Authentication.

Passwords and shared secrets are knowledge authentication factors; therefore, using both together is still only termed Single-Factor Authentication. Only two of the three available authentication factors are employed in 2FA.

There is debate over whether using a username and password is the safest option when logging onto SFA services. A significant drawback of using a password to authenticate login information is that it takes effort and expertise to create and remember strong passwords.

Password protection is essential due to the prevalence of insider threats such as lost or stolen laptops, hard drives, and social engineering. Also susceptible to attack by brute force are passwords.

With enough time and resources, hackers can crack password login info security systems and steal firm data. Passwords continue to be the most popular form of single-factor authentication due to their low cost, simplicity of installation, and familiarity.

Depending on how they’re set up, additional security questions can complement single-factor authentication in ensuring that your account and data remain secure.

2FA Product Types

Tokens, RFID cards, and smartphone applications are just a few of the products and services for implementing 2FA. These are the two types of 2FA products:

  • Tokens are supplied to users when logging in, and infrastructure or Software detects and authenticates access for users who use their tokens properly.
  • Authentication tokens can be physical devices like critical fobs, smart cards, or Software such as mobile or desktop programs that generate PIN digits for authentication. 

One-time passwords (OTPs) are a type of authentication code that can be generated by a server and then checked by a separate authentication device or app. An authentication code must be used to verify a person or device’s identity. This code is a short sequence that can only be entered once.

To authenticate token holders, businesses need a system that collects user data, does analytics, and then either grants or denies access to that data based on the user’s token status. Two-factor authentication (2FA) guarantees that only authorized users can access restricted resources. 2FA relies heavily on linking the authentication system to an organization’s authentication data.

Windows Hello, compatible with Microsoft accounts, provides a piece of the infrastructure necessary for businesses to adopt 2FA on Windows 10.


What Is Two Factor Authentication and Why Is It Important: Push Notifications

A push notification can be sent to a protected app on their smartphone to verify a user’s identity to alert them to an authentication attempt. The user can examine the authentication attempt details with a simple swipe and decide whether to grant or deny access. When the user verifies their identity, the server is alerted, and the user is granted access to the resource.

Push notifications allow users to authenticate their identification by using a registered device (often a mobile smartphone). If a malicious actor compromises a device, push notifications may also stop working as intended. 

Push notifications are safer than conventional authentication methods, yet they still have security flaws. Users may accidentally grant an attacker’s authentication request if they are accustomed to tapping approve on push alerts.

What Is Two Factor Authentication and Why Is It Important: Is This Authentication Secure?

Your account will be safer and more secure with two-factor authentication, but the security of any 2FA system is only as good as its weakest link. For example, hardware tokens’ safety depends on the manufacturing company. In 2011, RSA Security’s SecurID tokens were stolen, causing one of the greatest 2FA data breaches.

The account recovery method resets a user’s passcode and provides a new password to allow re-logging. Despite its low cost, ease of setup, and high usability, 2FA via text message is vulnerable to numerous assaults.


What Is 2FA and Why Is It Important: Two Factor Authentication for Smartphones

Many different types of 2FA capabilities exist on modern smartphones, giving organizations flexibility in selecting the best method. Many devices’ cameras may perform a biometric or retinal scan, and others can recognize the user’s voice. 

Cell phones equipped with global positioning systems add a layer of verification to the process. Regarding 2FA, text messages can also do the trick.

You’ll need a valid mobile phone number to receive verification codes via text message or automated phone call. A user must verify at least one phone number to use mobile 2FA. Using an authenticator app, you no longer need to rely on a verification code delivered via text message, phone call, or email. 

When using Google Authenticator with a supported website or service, users must complete a knowledge factor during each login. The following prompt will have the user enter a six-digit number. An authenticator generates a message by SMS without the user having to wait for one. Unique to each user, the numbers are refreshed every 30 seconds. Users finish the verification process by supplying the correct number for the suitable device.

Why Companies Are Avoiding SMS as 2FA?

Using the second piece of information to verify a user’s identity is becoming increasingly common. Individuals are confirmed based on their knowledge and their possessions. Users who sign up for a service that requires a login and password will receive a random code through email or text message. A random code is sent to the user’s phone, and they already have access (they know the login and password).

Using 2FA via SMS is problematic for four reasons:

  • Messages can be costly.
  • It is inconvenient for consumers who frequently need to manually enter the verification code into an app or on a different device.
  • SMS interception vulnerabilities have emerged in recent years, reducing its efficacy.
  • Messages don’t consistently deliver to the user.

WhatsApp, which has nearly as many users as Facebook, now offers 2FA, in addition to SMS.

Google does the same thing internally by letting users log in with their Google account for some of its services. Instead of sending a text message, the user receives a push notification asking them to verify their account.


You’re a business owner and private user. Two-factor authentication reduces the danger of account takeover, which could expose your organization’s sensitive assets and accounts.

It would help if you did not skimp on security and should always use two-factor authentication. It’s incredibly efficient, and many companies and accounts are already using it and backing it.

New methods that are more commonly recognized and likely to be adopted by employees should be embraced by organizations. As Two-Factor authentication becomes more widely utilized, it will advance. Keep this article handy if two-factor authentication (2FA) is one of your security measures for protecting your accounts and data.

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