Collecting Credit Card Information - not to collect payment

Question

I am working in PHP on a Linux server with MySQL.

I have a requirement (that I have attempted to talk them out of) to collect credit card information from users so tha

Answer 1

If you send the file via email, be sure to use secured connexions (HTTPS / IMAP or POP3 over SSL, SMTP over SSL) on both sending and receiving computers and have the file encrypted prior sending. You can encrypt your mail and attachment via OpenPGP, too. Also, ensure the security between the two mail servers (sending and receiving), or simply use the same domain for sending and receiving email addresses. Do not use the password-feature of a ZIP file or related comrpessing container, since they are usually cryptographically weak. If you send it on a filesystem (ie. USB pendrive), be sure to use a crypted one (ie. TrueCrypt).

Be sure to have a secured computer where the download and upload takes part (encrypted partition where the download/upload takes place, no spywares on the system, passworded system, firewalled).