Recently, many customers have got mails and messages from their banks to change the ATM PIN of their debit cards. We now know the reason, with reports suggesting 3.2 million accounts in five leading banks -State Bank of India, Axis Bank, ICICI Bank, HDFC Bank and YES Bank -- are compromised. Bankers and cyber experts advise that ideally an ATM PIN should be changed every three to six months. Are they being overly cautious? Perhaps not. Several banks have already asked their customers to change their card security details and to stick to own ATM networks. According to Reshmi Khurana, country head-operations for Kroll Advisory Solutions, there are reports of customers reporting transactions on their debit cards in China, which is how banks came to know of the breach of data security. A certain foreign payment services company, whose system is believed to have been compromised, is going for a forensic audit. āWhile it is not confirmed, the breach of data seems to be on account of a ...