SET

The standard for ensuring privacy and protection for conducting credit card transactions over the Internet. SET utilizes digital signatures so that the transaction can be completed securely and confidentially by the customer, the merchant, and the bank. The customer does not have to send a credit card number over the Net because that information is already verified through the digital signature. Even though it's been endorsed by Visa, Mastercard, Microsoft, and Netscape, SET requires complex software built into browsers and has therefore not been widely adopted in the online marketplace.