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Much of the media coverage around the dangers of using a credit card on the Internet centres around the interception of data being passed from the customer to the Web store. In reality, the greatest risk arises from the theft of data from the Web store's server after it has been transmitted, either by a hacker or a dishonest employee.
If you are storing sensitive information on a server that is connected to the Internet, then ensure it is protected with a firewall. As an added precaution, whether you are building your own SSL-protected forms to capture credit card information or you are using a commercial e-commerce product, always make sure that credit card numbers and other sensitive information is encrypted if it is stored in your local system. That way, if your systems are compromised, the encrypted information - and your customers - will be protected.
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