The size of my wallet tends to grow fat every once and a while, I usually don’t carry a lot of cash so I blame all the receipts I tend to keep. Since I try to avoid carrying cash I pay almost everything with my credit card. Out of curiosity I wanted to see if I could get my credit card number by combining all the different receipts.
The card has sixteen numbers in four groups, not counting the secret three on the back of the card, and an expiration date.
Practically every receipt had the expiration date printed on them, from the rest there was a big variation. Given that my card number would be:
1234 5678 9012 3456
Some would mask all but one group:
**** **** **** 3456
Others would just mask one group:
1234 5678 **** 3456
After going through them all it seemed like group three was always masked, I have a feeling that this would be different if I had more receipts then again I can’t be sure. I’ll be checking this in the future. I’ve read about a law in the US (Federal Fair Credit Reporting Act) that would require that only the last 5 numbers are shown. In Sweden I don’t know if we have such a law.
The last receipt I found in my wallet was the one from the taxi home on Friday when I had had a night out. This taxi company actually printed out my full credit card number on the receipt along with the expiration date.
I can’t imagine how the company can be that stupid, I’ve sent them an email and now I’m eagerly awaiting their response.
I don’t know how many dumpster divers we have in my area, but it would be nice to not have to shred everything you through away, I mean it is a bit hot to use the fireplace during the summer. 🙂
[tags]security, credit cards, stupidity[/tags]