Data transmission between smart card and user, uses separate visual or audio data to allow user to transmit PIN without risk of interception of data

摘要

The data transmission between smart card (4) and user is through a computer (1), and is performed under the universal serial bus (USB) protocol, through first and second contact pads on the smart card chip. A third contact pad is used to communicate data with a specific visual or audio communication device (6). The visual or audio link is used to communicate private data such as a user's PIN.