An automated teller machine skimming scam exposed last week is shining a light on the never-ending "arms race" in security technology.

NCR Corp. has said it widened the gap a year ago with the introduction of its tamper-resistant SelfServ line, which is equipped with a fraudulent device inhibitor — a design feature meant to thwart skimming devices that fraudsters affix to ATMs' card slots to glean card data. Skimmers are often paired with cameras to steal customers' PINs.

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