Always use a secure Internet connection when making a purchase.

Reputable sites use technologies such as SSL (Secure Socket Layer) or SET (Secure Electronic Transmission) that encrypt data during transmission.

You can tell if this technology is in use when the lock icon at the bottom of your web browser window is closed. (In no case should you send your credit card number by e-mail.) Another way is to check the address of the site you are accessing; it should begin with "https".