ATM maker NCR Corp. says it is seeing a rapid rise in reports of what it calls “deep insert skimmers,” wafer-thin fraud devices made to be hidden inside of the card acceptance slot on a cash machine. NCR says these deep insert skimming devices, usually made of metal or PCB plastic, are unlikely to be affected by most active anti-skimming jamming solutions, and they are unlikely to be detected by most fraudulent device detection solutions.