What Is the Luhn Algorithm? The Math Behind Credit Card Transactions
(scientificamerican.com)
4 points by speckx 4 hours ago
Fun Luhn fact: you can transpose any two odd or even indexed digits except the final check digit in a credit card number, and still get a card number that passes a Luhn checksum. You can use this to give cybercriminal scammers card numbers that probably aren't connected to any actual account.
by bediger4000 4 hours ago
... Did the author post his actual credit card number in that article?
by cratermoon 4 hours ago