News of the second Kmart credit card breach in three years at the retailer and the number of breaches at financial institutions doubling this year over the same period in 2016 should raise concerns. Security experts provided strategies to credit unions and businesses to protect credit card data.

Two weeks ago, Sears Holdings, the parent company of Kmart, confirmed it experienced another malware-based data breach of its card processing systems, which were infected with a form of malicious code. The company did not reveal how many of its 735 Kmart locations saw signs of a breach.

Meanwhile as of May 30, the total number of breaches in the U.S. captured in the 2017 ITRC Breach Report from the San Diego-based Identity Theft Resource Center now totals 698, an increase of 35.3% over last year's record pace (516) for the same time period.

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