Re: Using Snort to find creditcard data?

To answer your question: yes, you could write a rule using a regular
expression. However, I would suspect it would result in a high false
positive rate due to the formatting (hyphens, space, etc). Also, a
string of numbers does not make a credit card.

So to do it right, you would have to write a plugin that takes the
numbers and determines if they are a credit card or not. The luhn
algorithm is very simple.

On 26 Sep 2007 19:35:42 -0000, [email protected] <[email protected]> wrote:
> Would it be possible to write a Snort rule that triggers on possible creditcard numbers and how would it look like?
>
> PCI standars says that all creditcard data should be encrypted, It woild be nice to verify that no card data shows up where it shouldn't...
>
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