OTP Based on ChannelsThere are many channels available to help the user in getting OTP. Here are some of the most common channels available and how the OTP based on the channel works. From the initiation up to the verification and grant the access.
1. SMS OTPSMS OTP refers to the delivery of a unique, time-limited password to a user's mobile phone via SMS (Short Message Service). It is a widely used method for two-factor authentication (2FA) and provides an additional layer of security for online accounts, applications, and services. The SMS OTP typically works:
- User Initiation: The user attempts to log in to a system or application
- Delivery via SMS: The OTP is sent as a text message to the mobile phone number associated with the user's account. The OTP is typically a short numeric code, often consisting of 4-6 digits.
- User Enters OTP: The user manually enters the received OTP into the appropriate field on the login screen or application.
- Verification by Server: The server verifies whether the entered OTP matches the one it generated for that specific session.
- Authentication Validation: If the entered OTP matches the OTP generated by the server, the authentication is considered successful. The user gains access to the desired system or application.
2. Email OTPEmail OTP refers to the delivery of a unique password within a short period to a user's email address for authentication purposes. This method commonly uses two-factor authentication (2FA) and provides an additional layer of security for online accounts, applications, and services. Email OTP typically works with the same steps and process as SMS OTP. The difference is in the destination where the system sends the OTP. With email OTP channels, the OTP code will be sent to the email address given by the user. So, the user has to check their email inbox and find the email containing the OTP. The OTP is typically a short alphanumeric code. The next process is also the same as the SMS OTP channel. However, it's crucial to be cautious of phishing attempts targeting email communications. As malicious actors may attempt to deceive users into providing their OTPs through fraudulent emails.
3. WhatsApp OTPAs with the other OTP channels, such as SMS or email, the same process applied to WhatsApp accounts as well. The difference is the OTP is sent to the WhatsApp number of the user. The message contained the alphanumeric code within a certain short period. The next process will be the same as the other channels. However, it's important to note that WhatsApp uses end-to-end encryption for messages. That way, it will ensure that your communications are secure and private.
4. Missed Call OTPMissed call OTP, also known as missed call verification, is a method of authentication that uses a missed call as a means to verify a user's phone number. Usually, the system uses this scenario where sending an SMS or email OTP may not be feasible. Here's how missed call OTP verification typically works:
- User Initiates Verification: The user provides their phone number during the verification process of a service or application.
- User Makes a Missed Call: The user initiates a call to the designated phone number given by the system or service. The call is disconnected automatically after a few rings before it is answered.
- Verification Confirmation: The system or service detects the missed call from the user's phone number and confirms it as a successful verification.
- Authentication Validation: Once the missed call is detected and confirmed, the system considers the phone number associated with the missed call as verified.