This is the most common design, but we still test some applications that encrypt the card number on the mobile device.

FORBES: Is Your Mobile App Safe?

Interestingly enough, it appears that one of the reasons why Anonymous was able to attack the website was because Stratfor neglected to encrypt the credit card and other personal information about its subscribers.

FORBES: Stratfor Hacked; Anonymous Claims Responsibility

Too much credit card theft was finally hurting them and they now require anyone who handles credit card information to encrypt that data.

FORBES: Why Rockefeller-Snowe's Regulations Won't Prepare The U.S. For Cyberwar

Licensed broadcasters encrypt satellite signals, with subscribers needing a decoder card to access them.

BBC: Premier League games can be shown on foreign decoders

The carriers say they want to encrypt and store the credentials in the phone's SIM card, the small chips placed in the back of phones to activate access to mobile networks.

WSJ: RIM, Carriers Fight Over Digital Wallet