ATM skimmers, the miniature devices that stealthily help fraudsters capture your credit and debit card data, are getting smaller and harder to detect. Skimmers have always been designed to blend in with any ATM theyre attached to, but for years a discerning eye or tug of the card reader were often enough to uncover them. Krebs on Security has been researching a number of devices recovered in Europe this year, and several of them were small enough to fit inside the ATM card slot itself. This translucent card skimmer sits right inside the card slot of an ATM machine.