using m2crypto to encrypt credit card numbers

[Mark McEahern]

[gyromagnetic]
> Managing keys is a fundamental problem with encryption. I would highly
> recommend that you not store the credit card numbers at all. Instead,
> store a (SHA, MD5) hash of the number, and then validate against the
> hash.

I'm not using the credit card number to validate--that's what the password
is for.  (I don't store the password, but a hash of it.)  I'm using the
credit card number to collect payment.

If I don't store the credit card number, how do I send it to the payment
processor to collect payment?

// mark

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