Submitted via IRC for Fnord666
SkimReaper, subject of a USENIX Security paper, detects most common card skimmers.
[...] At the USENIX Security Symposium here today, University of Florida researcher Nolen Scaife presented the results of a research project he undertook with Christian Peeters and Patrick Traynor to effectively detect some types of "skimmers"—maliciously placed devices designed to surreptitiously capture the magnetic stripe data and PIN codes of debit and credit cards as they are inserted into automated teller machines and point-of-sale systems. The researchers developed SkimReaper, a device that can sense when multiple read heads are present—a telltale sign of the presence of a skimmer.
(Score: 4, Interesting) by kazzie on Friday August 17 2018, @12:06PM
Having worked in retail in the UK for a few years (until 5 years ago) I can tell you that I have used the magstrip on customers' cards when their chip is non-functioning, but rarely. More common was swiping a magstrip-only card from overseas. Even more common was phoning card payments through manually with the bank due to IT failures. (Our company hadn't kept any card franking machines for offline payments.)
There are also some individuals who are issued a magstrip card by their bank for some disability/accessibility reason, I didn't see more that one or two of them.