Sending OTPs via SMS with Say it

Use Case

Dillo SMS for Sending OTP Passwords

Did you know that authentication with OTP codes via SMS is one of the most common and cost-effective methods to secure online registration, purchase processes, and access to sensitive data?
Let’s explore what OTP codes are and the advantages of using OTP via SMS.

What is an OTP Code?

OTP, an acronym for One Time Password, is a temporary password with a time limit. It is valid for a single access session or transaction, allowing the verification of the user’s identity when accessing a secure system (such as online accounts).

Advantages of OTP

Now that we understand that an OTP code is essentially a disposable key, why should we use it for authentication on our portals and accounts?

The advantages are manifold, here are the main ones:

OTP codes, unlike static passwords, achieve high-security standards. Protecting accounts and access with OTP code generation makes them invulnerable to replay attacks, which cannot be avoided with simple traditional passwords. Once intercepted, a static password can be easily used to gain access to the service or connected accounts. In contrast, if an intruder intercepts an already used OTP code, it cannot be reused as it is no longer valid.

Unlike other methods of strong authentication, sending an OTP code via SMS does not require the purchase of any hardware for generating temporary passwords. This reduces the implementation costs of the system. Additionally, it leverages one of the most widely used technologies worldwide—smartphones and mobile devices. The receipt of SMS does not require an internet connection.

In today’s digital landscape, web security and data privacy are increasingly discussed topics and often causes for user concern. By using preventive strong authentication measures such as OTP, we can protect our customers and enhance their experience on our websites or portals. By demonstrating an interest in safeguarding their data, users will have greater trust in our services and will reward our company.

How much will it cost? Is it really necessary? The costs for SMS sending services can vary, as can those for integrating two-factor authentication systems. However, the investments in question will undoubtedly be modest and economical compared to the costs resulting from the increasingly prevalent digital frauds and identity thefts. Prevention is better than cure!

OTP via SMS with Dillo: How Does It Work?

As mentioned, the OTP via SMS service is based on generating a one-time password or code sent via SMS to the user’s mobile phone. After a user-initiated request through a web interface, the system proceeds with generating and sending the temporary password to the mobile number provided by the user.

1. Trigger

The user attempts to access your secure system.

2. Your Application

Following the previous action, your application generates a temporary password and, by communicating with Dillo, triggers the sending of the password.

3. Dillo

Dillo takes charge of your application's request and sends the OTP code via SMS to the phone number specified by the user.

4. User

The end user receives the OTP code via SMS and enters it into the designated space.

5. Access

The portal verifies the correctness of the temporary password, allowing the user to securely access their account.

Use Cases of OTP via SMS

Sending temporary passwords via SMS is most applicable when there is a need to uniquely identify the user to protect them from potential intrusions and identity theft. This includes registration and authentication processes on platforms, portals, banking websites, e-commerce, and more.

OTPs via SMS are an excellent ally for entrepreneurs and professionals who need to sign digital documents quickly and securely. These authentication tools bypass the need for physical tokens or smart cards, making the digital signature process more practical, fast, and cost-effective.

For websites where users have access to their private data, using OTPs helps avoid privacy intrusion risks. By using OTPs, both the user and the entity handling their data are protected.

In online purchase processes, using OTP passwords ensures that the purchase order is processed only after the customer authenticates the transaction by entering the code received via SMS.

Have you finally decided to use the OTP via SMS system to enhance the security of your users and protect your data? Are you still uncertain and want the advice of an expert? Contact us; we look forward to getting to know you and helping you.
Until next time!



  • What is an OTP Code
  • Advantages of OTPs
  • How OTP via SMS Works
  • Use Cases of OTP via SMS


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