In what is being described as possibly the ‘biggest' case of data leak in India, personal details of more than 815 million Indians, sourced allegedly from the Indian Council of Medial Research (ICMR), have been leaked online, reported Hindustan Times on Tuesday.

The leak was initially noticed by Resecurity, an American cyber security and intelligence agency. According to the cyber firm, a ‘threat actor’ with the alias ‘pwn001’ posted a thread on Breach Forums – which describes itself as a ‘premier Databreach discussion and leaks forum’ – enabling access to records of 815 million (81.5 crore) Indians.

For a perspective, this is around 10 times the total population of countries like Iran, Turkey and Germany, the world's 17th, 18th, and 19th most populous nations, respectively. India, on the other hand, is the world's most populous country, with 1.43 billion people.

Threat actor 'pwn001' with a handle on X (formerly Twitter) advertised Aadhaar and passport information along with names, phone numbers, and addresses; these, the hacker claimed, were extracted from the Covid-19 test details of citizens registered with ICMR.

As a proof, ‘pwn001’ posted spreadsheets with four large leak samples with fragments of Aadhaar data. Upon analysis, these were identified as valid Aadhaar card IDs.

While there is no official response from ICMR or government, the report states that the Central Bureau of Investigation (CBI) is likely to probe the matter once it receives a complaint from ICMR.

In addition to this, all the top officials from various agencies, as well as ministries, have been roped in. Also, to control the damage, the required Standard Operating Procedure (SOP) has been deployed.