If you want to build a reliable mobile wallet service, you should probably avoid being hacked before you launch. CurrentC, a retailer-backed payment system billed as one of the chief competitors to Apple Pay, has notified_customers that hackers may have acquired their email addresses, as first reported by Business Insider. Parent company MCX asserted that only emails were obtained during the breach, but it did warn customers to avoid opening any suspicious emails or attachments. Even so, the hacking does raise questions about the security of CurrentC’s system, which stores financial data in the cloud and uses QR codes and...

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