"We expect result of the technical enquiry in the next 8-10 days. This will give us exact picture of the entire incidence. It will give us lead as to where hacking or compromise took place," Finance Ministry sources said.
Earlier this week, Finance Minister Arun Jaitley had said the government asked RBI and banks to provide details of the data breach and also banks' preparedness to deal with cyber crimes.
Several banks, including state-owned SBI, have recalled a number of cards while many others blocked the ones suspected to have been compromised and asked their customers to change PIN (personal identification number) before use.
Fraudulent withdrawals have been reported from 19 banks so far while complaints have been received from a few banks that their customers' cards were used fraudulently abroad, mainly in China and the US while the customers were in India.
The government asked regulator Reserve Bank of India (RBI) as well as banks to provide details of the data breach and also preparedness to deal with cyber crimes.
There are around 60 crore debit cards operational in India, of which 19 crore are indigenously developed by RuPay while the rest are Visa- and Master Card-enabled.
Of the debit cards affected, about 26.5 lakh are on Visa and MasterCard platforms while 6,00,000 are on RuPay. The breach reportedly involved some 90 ATMs.
The Hitachi ATMs deployed by many white label ATM players and Yes Bank were impacted by the malware while usage at other ATMs were completely secured.
While Visa and MasterCard, in separate statements, have stated that their own networks had not been compromised, Hitachi subsidiary Hitachi Payment Services, which manages some of the ATM network processing, was investigating the matter, including whether there was a malware problem.
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