SMS for Two-Factor Authentication (SMS 2FA)

SMS for two-factor authentication, also known as SMS one-time password (OTP) or SMS 2FA, is a system that allows users to verify their identities through a code that they receive via text messages. It is usually a second verifier for users to access a network, application, or system. SMS two-factor authentication is crucial for better security for users and businesses.

SMS 2FA has been used since it was developed in early 1996 by AT&T as a system for authorizing payments and other transactions. It has become increasingly popular in recent years as a way for businesses to verify user identities, protect confidential data, and block unauthorized access to systems and networks. Currently, 2FA SMS is the preferred choice for authentication used by millions of people around the world. And in this article, we will discuss more about SMS for two-factor authentication, its definition, and its importance.

What is SMS 2FA?

SMS authentication is a standard security feature on popular social media sites like Twitter, Instagram, and Google. It involves users receiving a text message with a code they must enter on the platform after logging in to access their account. It is a form of 2FA or MFA that is simple to use.

The user receives an SMS on their mobile device containing a unique numeric code during the login process. This code is called a ‘token code,’ and the user must input it to verify their identity and gain access to their online account.

SMS authentication is a security measure that makes use of possession-based authentication. It means that only the person who owns the phone number can access the account. Unauthorized access would require the thief to steal both your phone and password.

Who invented the 2FA?

The patent for the SMS 2FA invention belongs to AT&T. They developed the system in 1996 to be used for authorizing payments and other transactions. Kim Dotcom stated in 2013 that he had patented two-factor authentication in 2000 and even threatened to sue significant web services. However, the patent was later revoked by the European Patent Office.

Why is SMS 2FA important?

SMS two-factor authentication (2FA) is an important security feature and has become a widely adopted standard for login authentication. With the number of data breaches occurring in recent years, it’s essential to protect your accounts with additional layers of security.

The significance of online security has increased significantly in today’s world. With numerous transactions being conducted online, hackers and scammers are constantly searching for vulnerabilities in systems to take advantage of.

Cybercriminals repeatedly use malware attempts and phishing (or smishing) scams to target various businesses. They mainly aim to obtain user credentials, sensitive information or control finances. Thus, using two-factor authentication is crucial to protect against such threats.

For a long time now, passwords have been the primary way to secure our online presence, and they are still essential for ensuring the safety of our online accounts. Recently, passwords are no longer enough because they are easily cracked and stolen.

Implementing Two Factor Authentication is a simple and effective way to add an extra layer of security to essential accounts. It should be used for all accounts, including email, online banking, and system logins. The 2FA SMS option is convenient and affordable to enable this extra security measure.

How does SMS 2FA work?

Although more secure authentication methods are available, SMS two-factor authentication remains popular due to its simplicity. To explain it, SMS authentication works with the following steps:

The user accesses their account by entering their password.
The user will receive an SMS two-factor authentication or one-time password on their registered mobile number. It may be an alphanumeric mix code.
The user enters this code in the login form.
After verification, the user gains access to their account.

Most MFA/2FA providers offer support for SMS authentication. Businesses may use SMS authentication as an added layer of protection or use it in conjunction with other methods, such as an OTP app, biometric authentication, and voice recognition.

Who uses SMS 2FA?

SMS Two-Factor Authentication is used by various industries, from financial institutions to online retailers. The top sectors using SMS two-factor authentication are the following:

Finance and Banking – Banks and other financial institutions use SMS two-factor authentication to allow customers to access their accounts securely.
Retail – Retailers use SMS 2FA for online transactions, as it can provide an extra layer of security when shopping online.
Healthcare – Healthcare providers must maintain secure customer data. Leveraging SMS two-factor authentication helps protect confidential patient data and other sensitive information.
Universities and Schools – Protecting students’ confidential information is vital for educational institutions. Thus, they often require two-factor authentication when accessing online accounts.
Technology – Technology companies dealing with sensitive data use SMS two-factor authentication to protect their customers from data breaches and other security threats.
Government – Departments use SMS authentication to protect important documents from unauthorized access.

How do businesses use SMS 2FA in SMS Marketing?

Businesses can use two-factor authentication in their SMS marketing campaigns. The most commonly used method for 2FA implementation is through mobile phones due to its ease and convenience. Since almost everyone constantly owns and carries a mobile phone, it accelerates the verification process.

To access an account with SMS 2FA, you need something you know (your username and password) and something you have (your mobile phone). After correctly entering your username and password, a secret one-time passcode (OTP) will be sent to your phone as an SMS message. If you are the authorized person, you’ll enter the passcode to gain access to the system, application, or account.

An OTP code works only once and is used for a single login session on a digital device. SMS-generated OTPs provide extra security by requiring access to your username and password and SMS messages to access your account. OTPs are more secure than user-chosen passwords because they are unique to each session and user and expire quickly.

Some examples of how businesses use SMS 2FA for SMS marketing include the following cases:

Account registration – When creating an account on a business’s website or mobile app, the company may add extra security using SMS 2FA. Users supply their information during registration and receive an SMS containing a verification code to validate their phone number.
Password resets – To reset a password, businesses may send an SMS containing a one-time code to verify the user’s identity before allowing them to reset their password.
Promotions and special offers – Businesses can use 2FA in their SMS campaigns to offer exclusive promotions or discounts. Users can redeem their special offer by sending an SMS with a unique code.

Learn more about What is SMS Marketing? Guide and Benefits and how to make it work for your business.

How do businesses register to enable SMS 2FA?

Businesses can register for SMS two-factor authentication with any of the major providers. Registration is typically easy; businesses must provide basic information such as their company name, contact details, and preferred payment method. Here are the steps to follow in registering to enable SMS two-factor authentication.

Choose an SMS provider – To enable SMS 2FA, businesses should select a dependable one with 2FA features. There are several providers to choose from, such as JookSMS and Plivo, that provide APIs and tools for integrating SMS services into applications.
Set up an account – Businesses must sign up and create an account with the selected SMS provider. This process usually entails giving contact information, validating the account, and consenting to the provider’s terms and conditions.
Obtain an API key – Businesses must obtain an API key or authentication credentials from the SMS provider to add the SMS 2FA feature to their applications or systems. This API key is a secure identifier to enable businesses to submit requests and send SMS messages through the provider’s API.
Configure SMS settings – Once businesses have obtained the API key, they must customize their SMS settings to meet their needs. It involves specifying the sender name or number, personalizing the message templates, and establishing extra security measures, such as rate limiting or IP whitelisting.
Implement the API – To proceed, the business needs to add the SMS provider’s API to its application or system and write code that manages the authentication process, creates OTP codes, and sends SMS messages to clients.

Does registering for SMS 2FA cost a lot?

No. Most SMS providers offer a free basic plan and charge monthly rates for additional features or higher volumes of messages. The cost is typically quite low, as businesses mostly pay for the number of messages they send. Additionally, some providers offer discounts based on usage and loyalty packages that provide better value for money. Businesses should compare the costs associated with different providers before selecting one.

How long does it typically take to receive an SMS for 2FA?

The time to receive an SMS usually depends on the provider and the network in use, but generally, an SMS authentication code is sent almost immediately. However, if there are many messages or technical difficulties, it could take up to a few minutes for the message to arrive. Most sites and apps provide up to two minutes before the code expires, and the user will request a new code when this time has lapsed.

What is the duration of SMS 2FA?

SMS two-factor authentication typically lasts no more than a few minutes, as most codes are valid for a short period. It ensures that the code is secure and cannot be used by anyone other than its intended recipient. The expiration time is around 30 seconds to two minutes. The shorter time limit means that even if a hacker has accessed your account, they cannot use the code.

What to do if SMS 2FA is not received?

If users don’t receive an SMS for two-factor authentication, they can take a few steps, as listed below.

Check the phone for network signal – If the phone does not have a strong signal, there could be an issue with the network or the phone’s settings.
Check SMS settings – Check if SMS services are enabled on the user’s device and if any changes were made to their messaging settings.
Ensure that the mobile phone number is registered to the account you are accessing – If the user has multiple accounts, they should check that the correct phone number is registered for each account.
Check if the SMS provider is already sending messages – Some providers will stop sending messages when their servers are overloaded or under maintenance.
Contact customer support – A business’s customer service team can provide support to resolve any issues related to two-factor authentication.

What are the Benefits of SMS 2FA?

SMS 2FA has many benefits that businesses today enjoy. Although there are some worries about SMS authentication, these advantages outweigh them.

Secure – SMS 2FA is considered more secure than a password alone, as it requires two forms of authentication – something the user knows (i.e., their password) and something they have (their mobile device).
Convenience – Users reuse passwords because they have to remember too many different ones for all their online accounts. Research indicates that people must recall an average of 10 passwords daily. However, SMS authentication can simplify this process by sending exclusive codes directly to users. To verify their identities, they can enter these codes on a website or app.
Better than no 2FA – Using multiple pieces of information to prove an identity is more secure than using a single factor, so SMS authentication is safer.
Low cost – SMS authentication generally costs less than other forms of two-factor authentication, making it an attractive option for businesses.

What are the Risks of SMS 2FA?

Despite its many benefits, SMS authentication does come with some security risks that businesses must consider.

Social engineering attacks – Social engineering attacks like phishing are just as common on mobile devices as on computers. These attacks involve scammers pretending to be a trusted organization and tricking people into giving them their personal information, passwords, and even SMS codes. With this information, the scammers can gain unauthorized access.
Lost and synced devices – Using SMS authentication is risky because mobile devices are frequently lost or stolen. It is even riskier if the device is logged into social media accounts or banking apps. Synced devices allow bad actors to access text messages and other data from multiple smartphones, laptops, tablets, and wearables.
SIM swapping – Although receiving an authentication code on a personal mobile phone may seem secure, it is not foolproof. Hackers can intercept SMS messages by contacting a phone company and providing the target’s personal information, such as their SSN, to request a number transfer to another phone. It allows them to access any authentication code sent via SMS to the transferred number.
Online account takeover – Wireless service providers offer the option to view text messages through online accounts on their web portals. However, securing these accounts with a trusted second factor is essential, as bad actors may gain access and try to monitor them to obtain SMS authentication codes.
SIM hacking – SMS or text message intercept attacks, including SIM hacking, are a potential danger. Attackers may use techniques such as spoofing cell phone tower signals and SS7 systems, which are employed to enable data roaming, to gain access to the content of private messages.

Why do businesses switch from SMS 2FA to Authenticator App?

Businesses are switching from SMS 2FA to authenticator apps to enhance customer authentication security. These apps are often more efficient, especially for managing volumes of requests. Including an authenticator app in your data security management plan can add an extra layer of protection.

Authenticator apps function similarly to SMS text messages. Upon using the app, users receive a code alongside their login information to access their accounts. Unlike SMS, however, the app is linked to the user’s device, and the codes are not transmitted over the mobile network, making it impossible for hackers to intercept them this way. Even if a hacker were to redirect the user’s number, they would not receive the codes.

Authenticator apps provide the benefit of generating new codes every 30 seconds, which expire quickly. Depending on the service, you can enter the code or use a one-tap verification. These codes are synced with the app and your device, ensuring optimal security, and only work once.

Some popular authenticator apps include Google Authenticator, Authy, and Microsoft Authenticator.

Is SMS Two-Factor Authentication Safe?

Yes. SMS two-factor authentication is a secure way to protect against unauthorized access. It adds an extra layer of security to accounts, making it more difficult for bad actors to gain access. However, businesses must consider the risks associated with SMS authentication and take steps to mitigate them.

The best way for businesses to ensure their customer data is safe is by implementing robust data security with fewer vulnerabilities than SMS 2FA. Criminals can intercept, phish, and spoof SMS messages in various ways.

Fraudsters can send text messages that appear to be from a legitimate source, requesting a code. If the user responds with the correct code, the fraudster can gain access to the account.

Fraudsters can activate a new phone number by pretending to be a victim of a hacking attempt. With this, they can breach the 2FA even before the real victim realizes it. Using this method, thieves successfully convinced AT&T, the phone provider of Cloudflare, to redirect phone and email. As a result, the thieves could access the victim’s account details through the 2FA process.

Is SMS OTP the same as SMS 2FA?

No, SMS OTP (one-time password) is different from two-factor authentication. While they may use both SMS messages to send code for verification, how this code is generated and used differs. An SMS OTP provides a single, one-time password that must be used within a specific time frame, usually within a few minutes. SMS 2FA, on the other hand, sends multiple one-time passwords with varying validity duration for use in authentication.

Although both SMS OTP and SMS 2FA use codes to authenticate users, the level of security offered by each method is different. While an OTP can be easily guessed or intercepted, a 2FA code is more secure. It is because the code generated in SMS 2FA changes with every attempt and can only be used once, making it almost impossible for hackers to gain access. Additionally, SMS 2FA codes are usually sent through an encrypted channel, adding an extra layer of protection.

What is the difference between SMS 2FA and SMS Authentication?

SMS authentication and SMS 2FA are two different technologies used to authenticate users. They differ in the following contexts:

Authentication Process – SMS authentication is a one-step process that verifies the user’s identity by sending a code to their phone. On the other hand, 2FA involves two steps: first, collecting the user’s credentials, and second, sending them an additional code as verification.
Duration of Code – An SMS authentication code is usually valid for a few minutes. Whereas an SMS 2FA code is valid for longer, usually several hours.
Security – SMS authentication is less secure than two-factor because it only requires one step for verification. However, with two-factor authentication, users must enter their credentials and the unique code. This adds another layer of security and makes it more difficult for hackers to gain access.

Overall, SMS 2FA is a secure and reliable authentication method that offers businesses additional customer security. It is also simple to set up and cost-effective in the long run. Businesses considering two-factor authentication should weigh the risks before switching from SMS OTP to SMS authentication.

SMS for Two-Factor Authentication (SMS 2FA): Definition and Importance