Credit card transactions are encrypted using Secure Socket Layer (SSL) convenience, a protocol for the Internet. Secure Socket Layer convenience secretly encodes information that is being sent over the Internet. It ensures that the information remains confidential by preventing eavesdropping, tampering, or message forgery.
The use of SSL requires that you have an SSL compatible browser. Currently, Firefox, Internet Explorer, Opera, and Safari are all SSL-compatible. (Note that older versions of these browsers may not support SSL sessions). If you don't have a browser with SSL capabilities, you can download an SSL browser from either the links above for free.