An OTP arrives on your phone.
You see six digits in the notification preview. You are busy, so you read the code quickly and continue with what you were doing.
But did you read the complete message? Did you check why the OTP was generated? And, most importantly, did you initiate the transaction or login yourself?
These small questions can make a significant difference between protecting your account and becoming a victim of digital fraud.
India’s Telecom Regulatory Authority of India (TRAI) is reportedly considering a standard format for OTP messages to help users identify genuine authentication messages and reduce opportunities for misuse. The proposal, reported on 20 October 2026, is still under consideration; it should not be mistaken for an already implemented rule.
The reported discussions include making the sender, purpose and validity period of an OTP clearer, along with concerns about codes being visible in notification previews.
The important question is not just how OTPs are delivered. It is how fraudsters manipulate people into trusting, revealing or using them.
1. What Is OTP Fraud?
A one-time password (OTP) is a temporary code used to verify an identity, login, transaction or other activity.
OTPs provide an additional layer of security, but they are not a guarantee against fraud. If a victim is manipulated into sharing a code or approving an unauthorised action, an attacker may be able to complete an activity that requires that verification.
The precise outcome depends on the service, authentication design and other security controls.
Common social-engineering techniques include:
- Bank or payment impersonation: A fraudster pretends to represent a bank, payment service or customer-support team.
- Account-verification scams: A victim receives a call or message claiming that an account must be verified immediately.
- Fake customer support: The attacker creates a false technical or transaction-related emergency and asks the victim to reveal a verification code.
- Urgency and intimidation: The victim is told that an account will be blocked, a payment will fail or access will be lost unless immediate action is taken.
- Unauthorised transaction attempts: An unexpected OTP arrives because someone may be attempting to log in, register a device, reset credentials or initiate another protected action.
An unexpected OTP does not, by itself, prove that an account has been compromised. However, it is a warning to stop, check the context and investigate through an official channel.
2. How Attackers Exploit OTPs
Consider this illustrative scenario.
A person receives an unexpected OTP. Shortly afterwards, someone claiming to be from customer support calls and says the code is required to cancel a suspicious transaction.
The caller sounds professional, uses familiar terminology and pressures the victim to act quickly.
If the victim shares the code, the attacker may be able to complete the specific authentication action for which the OTP was generated.
The attacker does not necessarily need to break the encryption of a banking application or exploit a software vulnerability. The weakness may instead be the victim’s trust, confusion or inability to distinguish the real purpose of the code.
A simplified attack flow
Stage 1 — Preparation: The fraudster impersonates a trusted institution or creates a convincing message.
Stage 2 — Trigger: The victim receives an unexpected OTP, or the attacker induces an authentication or recovery process.
Stage 3 — Social engineering: The attacker calls or messages the victim and invents a reason to obtain the code.
Stage 4 — Disclosure or approval: The victim shares the OTP or approves an action without understanding its purpose.
Stage 5 — Attempted account access or transaction: The attacker uses the code for the relevant authentication step, if the service permits it.
Stage 6 — Possible financial or account impact: Depending on the controls in place, the attacker may gain access, change account settings or complete an unauthorised transaction.
Stage 7 — Detection and response: The victim or institution identifies suspicious activity and takes steps to contain the incident.
This is a generalized fraud scenario, not a reconstruction of a specific victim incident. Not every OTP scam follows all these stages.
3. Why Can OTP Notification Previews Be a Concern?
A code displayed on a locked phone screen may be visible to someone looking over the user’s shoulder or to another person who can see the device’s notifications.
That does not mean every notification preview creates a security incident. The risk depends on the device’s lock-screen settings, the person’s access to the phone and whether the code is useful to an attacker.
There is also a separate risk: people may read only the digits while ignoring the surrounding message.
The full message can provide context about the service, the requested action and the code’s validity. Even then, sender names and message formats can be imitated, so the message should not be treated as proof that a request is legitimate.
4. What Is TRAI Considering?
According to a report published by Mint on 20 October 2026, TRAI has discussed standardising OTP SMS formats with telecom operators and may issue a consultation paper before making a final decision.
The reported proposal could make OTP messages more consistent by identifying:
- The organisation or sender associated with the message.
- The purpose for which the OTP was generated.
- The code’s validity period.
- How the OTP appears in message notifications.
A more consistent format could help users recognise the purpose of an authentication message and make it easier to notice suspicious requests.
However, standardisation alone cannot eliminate fraud. A criminal can still impersonate a bank over a phone call, manipulate a victim into approving an action or exploit weaknesses in an account’s recovery process.
Regulatory improvements can support security, but informed user behaviour and strong authentication controls remain essential.
TRAI has already taken broader steps to address messaging abuse. In August 2024, it directed telecom service providers to implement measures including whitelisting specified URLs and other resources in messages and improving message traceability. These measures address parts of the messaging ecosystem; they should not be confused with a finalised uniform OTP format.
5. Historical Context and Regulatory Timeline
20 August 2024 — Messaging safeguards: TRAI announced measures to curb misuse of messaging services, including URL and APK-link whitelisting and message traceability requirements.
2024 onwards — Greater focus on traceability and spam controls: Regulatory and telecom-provider measures have sought to make suspicious communications harder to distribute and easier to investigate.
20 October 2026 — Reported OTP-format discussions: Mint reported that TRAI was considering a more uniform OTP SMS format, potentially including clearer information about the sender, purpose and validity of the code.
As of 25 October 2026 — Status: The uniform OTP format remains a reported proposal under consideration. Users should not assume that a new format or notification-preview restriction has already been implemented nationwide.
Sources
- TRAI, measures to curb messaging misuse (20 August 2024): https://www.pib.gov.in/PressReleasePage.aspx?PRID=2046872
- Mint, “Trai plans uniform OTP format to curb scams” (20 October 2026): https://www.livemint.com/news/trai-otp-sms-financial-scams-11792401514938.html
6. Who Is Behind OTP Fraud?
OTP fraud is a technique, not a single malware family or threat-actor identity.
It can be used by individual scammers, organised fraud groups and criminals who impersonate legitimate institutions. The delivery method may involve phone calls, SMS, messaging applications, fake websites or combinations of these channels.
Attribution requires evidence. A convincing phone call, an unexpected OTP or a suspicious transaction is not sufficient to identify a particular criminal group.
Investigators may need call records, message headers, transaction records, account-access logs, device information and other evidence before drawing conclusions.
For public awareness, it is more useful to understand the attacker’s method than to attach an unsupported threat-actor name to every incident.
7. How Can You Protect Yourself?
For individuals and families
1. Never disclose an OTP to a caller. A person claiming to be a bank employee, police officer or support agent does not become trustworthy because they know your name or account details.
2. Read the complete message. Check which service generated the code and what action it refers to.
3. Ask yourself whether you initiated the action. If you did not request a login, payment, password reset or registration, do not proceed.
4. Do not approve unexpected authentication prompts. An unsolicited request should be investigated rather than accepted.
5. Hide sensitive lock-screen notifications. Configure your phone to conceal message contents while locked, where supported.
6. Verify independently. Contact the institution using its official application, website or a verified phone number—not a number supplied by an unexpected caller.
7. Secure the underlying account. Use strong, unique passwords, enable available multifactor authentication and activate transaction alerts.
8. Act immediately if fraud is suspected. Contact your bank or payment provider to block or dispute unauthorised activity and report the incident through official channels.
In India, suspected cyber financial fraud can be reported through the National Cyber Crime Reporting Portal at https://cybercrime.gov.in or by calling 1930. Prompt reporting may help the authorities and financial institutions respond more quickly.
For organisations and service providers
- Make authentication messages understandable and explicit about the action being verified.
- Avoid exposing sensitive codes unnecessarily in notification previews.
- Apply risk-based authentication and transaction monitoring.
- Rate-limit authentication and account-recovery attempts.
- Alert users to unusual logins, device registrations and high-risk transactions.
- Provide a clear process to revoke sessions and recover compromised accounts.
- Educate customers that legitimate support personnel should never ask them to disclose an OTP over a call.
8. The Bigger Lesson: Authentication Is a Shared Responsibility
The reported TRAI initiative is a useful reminder that security is influenced by more than passwords and software.
Message design, telecom controls, application security, authentication workflows and user awareness all contribute to reducing fraud.
A standard OTP format may improve clarity, but it cannot make a user immune to manipulation. Criminals adapt their stories to the security controls in place.
The safest habit is simple: an OTP is not merely a number to read—it is permission for a specific action. Understand that action before you proceed.
Pause when a request is unexpected. Verify through an independent channel. Never let urgency replace judgment.
Cybersecurity begins with technology, but it also depends on the decisions we make every day.
Research and awareness by CyberRakshakLabs
For more cybersecurity research and practical awareness guidance, visit:
https://cyberrakshaklabs.in/research/
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Research and awareness by CyberRakshakLabs. For more cybersecurity research, visit CyberRakshakLabs Research Library.