LAS VEGAS—In a city filled with slot machines spilling jackpots, it was a "jackpotted" ATM machine that got the most attention Wednesday at the Black Hat security conference, when researcher ...

Consider: In the years that followed the roll-out of the modern ATM in the 1970s and 1980s, little was done to enhance the machines. ATMs got sturdier, more accessible and easier to use.

It's called "jackpotting." It works just like it sounds, an ATM machine is compromised to spit out cash to a fraudster at a furious rate of 40 bills every 23 seconds. "That’s where you get the ...