Detecting Restaurant Credit Card Fraud with Checksums
Clever technique to put a checksum into the bill total when you add a tip at a restaurant.
I don’t know how common tip fraud is. This thread implies that it’s pretty common, but I use my credit card in restaurants all the time all over the world and I’ve never been the victim of this sort of fraud. On the other hand, I’m not a lousy tipper. And maybe I don’t frequent the right sort of restaurants.
Food Eater • October 21, 2007 2:50 PM
Neat technique. Much easier than keeping track of credit card receipts.
Dugg for all to see and use.
http://digg.com/security/Detecting_Restaurant_Credit_Card_Fraud_with_Checksums