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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.<\/p>\n
The card has sixteen numbers in four groups, not counting the secret three on the back of the card, and an expiration date.<\/p>\n
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:<\/p>\n
1234 5678 9012 3456<\/p>\n
Some would mask all but one group:<\/p>\n
**** **** **** 3456<\/p>\n
Others would just mask one group:<\/p>\n
1234 5678 **** 3456<\/p>\n
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.<\/p>\n
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.<\/p>\n