Patent ID: 8517264

Claim:
A smart card comprising: a host integrated circuit (IC) disposed on a board, the host IC being configured to receive a signal by contacting a user terminal, and the host IC being further configured to execute a service in accordance with the received signal; and one or more secure authentication ICs disposed on the board, the one or more secure authentication ICs being configured to receive a signal from the user terminal only through the host IC, accommodate an application independent of the host IC, and configured to execute a function of the application, wherein, the host IC includes a plurality of main contact pads configured to receive signals from the user terminal and one or more sub-contact pads contacting the one or more secure authentication ICs, the plurality of main contact pads including: a first main contact pad configured to receive a power voltage; a second main contact pad configured to receive a reset signal; a third main contact pad configured to receive a clock signal, a fourth main contact pad configured to provide a ground for the host IC, and a fifth main contact pad configured to be an interface, and the one or more sub-contact pads including: a first sub-contact pad configured to output a host power voltage; a second sub-contact pad configured to output a host reset signal; a third sub-contact pad configured to output a host clock signal; and a fourth sub-contact pad configured to interface with the secure authentication IC; each of the one or more secure authentication ICs includes a plurality of contact pads contacting the host IC; and wherein first to fourth ones of the plurality of contact pads are connected to the first to fourth sub-contact pads, respectively, and a fifth of the plurality of contact pads is grounded.