This is about to go out to CPAN, but since it seems there is some question as to how to do this, I'll send it out a little early. Attached is a module for safely encrypting and storing credit cards using the Business::OnlinePayment interface.
Public key encryption is the best that can be done here, but even so, if a cracker compromises your machine, he can just add a "warn $cc_number" in your code before you encrypt it. Your old cards will be safe though.
- Perrin
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