Card skimming is when cybercriminals add their own spying equipment to an automated teller machine (ATM) or point-of-sale system (PoS) to copy the information they process from credit or debit cards. Offline carders organize in closed networks Known as "real/offline carding," this technique is ancient and has been giving headaches to both banks and the customers that got their cards copied. Closed communities of professional skimmers have evolved into networks that provide both logistics and information for running card skimming operations. Fast swiping with upgraded version Audio skimmers turn into a more potent kit when they are fitted with a camera that captures the card PIN number, becoming what is known as a video skimmer. "They use timing-calculating algorithms to “reed” the audio when the card is been scanned by the ATM, which allows them to decode a track in 1-2 seconds and immediately convert it into text format," Boguslaskiy explains. Dedicated shops Sellers of card skimming 'ware' have dedicated websites where they offer all the kits necessary for slurping data on the card when clients put their plastic in an ATM.