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The 'time-travel' flaw that prompted India to block Telegram ahead of NEET-UG retest

A Telegram editing feature is a vulnerability that the NTA said scammers exploit to fabricate evidence of paper leaks.

Updated on: Jun 17, 2026, 11:24:28 IST
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The Ministry of Electronics and Information Technology (MeitY) on Tuesday blocked Telegram and ordered the company to disable its message-editing feature — two directions issued on the recommendation of the National Testing Agency (NTA) ahead of the NEET-UG re-examination on June 21.

Security persons checking aspirants before appearing in the NEET UG 2026 exam conducted by National Testing Agency (NTA) at an examination centre in Patna. (Santosh Kumar/HT)
Security persons checking aspirants before appearing in the NEET UG 2026 exam conducted by National Testing Agency (NTA) at an examination centre in Patna. (Santosh Kumar/HT)

The move targets organised fraud operations running on the app. The editing restriction addresses a design vulnerability that the NTA said channel administrators had exploited to fabricate evidence of paper leaks. It involved uploading a blank document before an examination and replacing it with the actual question paper afterwards, while Telegram’s architecture preserved the original, pre-exam timestamp, they said.

Critics and Telegram have argued that the blanket block penalises millions of ordinary users who have no connection to exam fraud.

Action against Telegram world over

Telegram has had multiple run-ins with governments across the world. Headquartered in Dubai, the platform operates through a network of companies across multiple jurisdictions, making cross-border data requests difficult to enforce.

Brazil and Russia: Both countries have previously banned Telegram for non-compliance with court orders, including demands for data on extremist groups and, in Russia's case, encryption keys for state intelligence services.

UK: Regulators are investigating Telegram under the Online Safety Act over its alleged failure to remove illegal content from the app.

Also read: How NEET exam was leaked: ‘2 sets of questions papers’, 3 masterminds and a 5-state network

NTA denied that NEET-UG re-test question papers have been leaked

What makes Telegram different?

Law enforcement agencies distinguish Telegram from messaging apps such as WhatsApp or Signal on the basis of features that function less like private messaging and more like unmoderated mass broadcasting. These include:

Mass reach: Telegram channels can have unlimited subscribers and ‘supergroups’ can host up to 200,000 members, enabling content to reach large audiences instantly.

Built-in search: Unlike closed messaging apps that require an invitation link or phone number to join a conversation, Telegram has a public search function. Anyone searching basic keywords can find public channels operating under names such as ‘PAPER LEAKED NEET’ or ‘Private Mafia’.

Static timestamp: When a message is edited, Telegram updates the content but retains the original timestamp from when the message was created. The app provides no visible edit history to readers.

Also read: Delhi court allows NEET leak accused take re-test: 'Right to education fundamental'

The 'time-travel' leak scam

Technical demonstrations — including one highlighted by IIT Madras director V. Kamakoti in a video released by the NTA on Tuesday — showed how scammers exploit the system.

1. Setting the trap

A channel administrator creates a public Telegram channel and attaches a discussion group — a message board where subscribers can comment. When the administrator posts a document in the main channel, Telegram’s backend automatically mirrors an identical copy into the linked discussion group.

2. Planting the seed

Days before an examination, the administrator uploads a blank or dummy PDF to the channel. The post registers a timestamp — say, June 18 at 10am — and the same post gets mirrored in the discussion group.

3. The silent file swap

After the exam, once the question paper is public, the administrator edits the original post, replacing the dummy PDF with the actual question paper.

In the main channel, Telegram adds the ‘edited’ label next to the original timestamp. The file gets updated in the discussion group too, but the platform does not carry forward the ‘edited’ tag there.

4. The execution

The scammers then lock group comments and direct users into the discussion group view.

To a student or parent, the document sits in the chat bearing a pre-exam timestamp, with no indication that it has been altered. This creates the illusion of a paper leak before the exam, allowing fraudsters to extract money from families and candidates under the guise of insider access.

 
ABOUT THE AUTHOR
Sanjay Maurya

Sanjay Maurya is a Principal Correspondent with Hindustan Times, where he covers education, with a focus on school and higher education, competitive examinations, education policy and governance. Working as part of the National Bureau, he is based in New Delhi and reports on the Ministry of Education and covers various statutory bodies like UGC, AICTE and NCTE and autonomous bodies like CBSE and NCERT. His reporting also tracks the implementation of key government reforms and policies from school education to higher education including in IITs, NITs, IIMs, central and state universities, and their impact on students and educational institutions. His reporting on the irregularities and rushed implementation of CBSE's On-Screen Marking (OSM) system for evaluation of Class 12 board exams 2026, triggered administrative action, leading to the transfer of the board's two senior-most officials and the constitution of a committee to probe alleged irregularities in procurement process of the system. He joined Hindustan Times in December 2024. Prior to that, he had a three-year stint at Careers360, where he reported on school and higher education, entrance examinations, admissions, rankings and various education policies involving universities and professional education bodies. Over the years, Maurya has reported extensively on major developments in India's education sector, including the implementation of the National Education Policy (NEP) 2020, reforms in the National Testing Agency (NTA) following the NEET-UG 2024 controversy, changes in school education, higher education regulation, and the evolution of entrance examinations such as NEET, JEE and CUET. He regularly produces data-driven and explanatory stories based on government documents, parliamentary proceedings, court records and official data. His focus remains on helping readers understand how education policies and institutional decisions affect millions of students, teachers and educational institutions across the country.

ABOUT THE AUTHOR
Sejal Sharma

I am a technology policy reporter with the National Political Bureau at Hindustan Times, based in New Delhi. I cover digital policy and the intersection of technology and society, focusing mainly on what's happening in India. My beat often involves tracking platform regulation, privacy, internet curbs, and the real-world impact of digital rules, among other things. Can usually be found reading government notifications so that you don't have to. I cover three key ministries: Ministry of Electronics and Information Technology (MeitY), Ministry of Communications, and the Ministry of Information and Broadcasting (I&B). I am originally from New Delhi and a graduate of the Asian College of Journalism, Chennai. Over the past nine years, I have worked across television, digital and print media with The Secretariat, CNN-News18, Tiranga TV, Interesting Engineering, and now Hindustan Times. Although I am not on X, I can be reached at sejal.sharma@hindustantimes.com for tips, a chat or book recommendations. I respond fast, usually within a couple of hours. Outside of work, I enjoy playing badminton and driving my car. I am a firm believer that every trip — work or leisure — deserves a fridge magnet.

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