Quote:
Originally Posted by signupdamnit
Many people have no idea that masking the first four or six digits of the card does little to help security since it's often still easily derived. The same for the people masking two digits towards the end. They don't realize that there are checksums which might help someone to narrow it down.
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I didn't notice you beat me to it.
Plus you can guess based on the card type and how old it is.
i.e. Visa: 4432 6465 xxxx xxxx
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