Hacker claims to have critical security data, SIM card details of BSNL customers

Bharat Sanchar Nigam Ltd (BSNL) has suffered a data breach, and according to a report by digital risk management firm Athenian Tech (seen by the Economic Times), the hacker has claimed to have accessed sensitive information, including international mobile subscriber identity (IMSI) numbers, SIM card details, home location register data and critical security keys from the breach.