"Only about 0.5 per cent of total debit card details were compromised while remaining 99.5 cards are completely safe and bank customers should not panic," Department of Financial Services Additional Secretary G C Murmu told PTI.
There are around 60 crore debit cards operational in India, of which 19 crore are indigenously developed RuPay cards while the rest are Visa and Master Card enabled.
A Canara Bank message to a customer said: "In view of security reasons...Please change the ATM pin immediately. In case not adhered to, we will be blocking the existing card on 21-OCT-2016."
Murmu said data of the users who have transacted from ATM machines of Hitachi have been compromised during the month of May, June and July.
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As far as financial loss is concerned, there is minimum impact as reports on losses due to this is being collated.
The genesis of problem was receipt of complaints from few banks that their customer's cards were used fraudulently mainly in China and USA while customers were in India, NPCI said in a statement.
Apprehending that this could be a case of card data compromise, all the ATMs / PoS terminals in India and three card networks - RuPay, Visa and MasterCard worked in a collaborative manner in the month of September 2016.
The complaints of fraudulent withdrawals are limited to
cards of 19 banks and 641 customers, NPCI statement said, adding that the total amount involved is Rs 1.3 crore as reported by various affected banks.
Cards of all these complainants are related to other card schemes and there is no RuPay cardholder who had lodged any complaint for such fraudulent usage, it said.
"It was suspected that a compromise was at switch level which is PCI-DSS certified. Hence, subsequently PCI Council (the international body which sets standards on for PCI-DSS) was persuaded to conduct a forensic audit of the switch of one bank which is likely to be the point of compromise. The forensic study is in progress and NPCI is in touch with relevant stakeholders," he said.
According to Yes Bank statement, it has proactively undertaken a comprehensive review of its ATMs, and there is no evidence of a breach or compromise on the bank's ATMs.
"We would like to inform that the possible breach of information of debit cards has taken place in the ATM network of another bank. As a precautionary measure, the PINs of debit cards used at the ATMs of that bank have been changed. This has been done in order to protect our customers from any potential fraudulent transaction," ICICI Bank said.
"We immediately notified customers who we knew had used a non-HDFC Bank ATM in the recent past to change (their) ATM PIN. We take this opportunity to stress that all our customers use HDFC Bank ATMs only and also change ATM PINs from time to time to prevent misuse," the bank said in a statement.