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If there are any obvious differences, don't use either one, and report the suspicious tampering to your bank.
For example, if one ATM has a flashing card entry to show where you should insert the ATM card and the other ATM has a plain reader slot, you know something is wrong.
Most of the time, the attackers will also place a hidden camera somewhere in the vicinity with a view of the number pad in order to record personal identification numbers, or PINs.
The camera may be in the card reader, mounted at the top of the ATM, or even just to the side inside a plastic case holding brochures.
Classic skimming attacks are here to stay, and will likely continue to be a problem even now that banks have made the shift to EMV chip cards, according to Stefan Tanase, a security researcher at Kaspersky Lab. rollout of EMV cards, some merchants still require customers to use the magstripe.
Even if the cards have a chip, the data will still be on the card's magnetic strip to be backwards compatible with systems that can't handle the chip, he told us. The typical ATM skimmer is a device smaller than a deck of cards that fits over the existing card reader.
The same is true for credit card readers at the checkout line.
It was when I learned that stealing a credit card number is as easy as plugging in a magnetic strip reader into a computer and opening a word processor.
When you slide your card in, the shimmer reads the data from the chip on your card, much the same way a skimmer reads the data on your card's magstripe. For one, the integrated security that comes with EMV means that attackers can only get the same information they would from a skimmer.
On his blog, security researcher Brian Krebs explains that "data collected by shimmers cannot be used to fabricate a chip-based card, but it could be used to clone a magnetic stripe card.
These are called skimmers, and if you're careful you can keep from being victimized by these insidious devices.
Skimmers are essentially malicious card readers attached to the real payment terminals so that they can harvest data from every person that swipes their cards.Below the slot where you insert your card are raised arrows embedded in the machine's plastic casing, to give users a hint about where their cards go.You can see how the grey arrows are very close to the yellow reader housing, almost overlapping.It's little more than an integrated circuit printed on plastic.