Smart cards currently exist for a vast of applications. However, the expected growth in the industry will not be due merely to growth in these segments, but also to the addition of the Internet and electronics commerce with their myriad of uses. A smart card, as mentioned above, is a portable computational device with data storage ability. As such, they can be a very reliable form of personal identification and a tamper-proof, secure information repository. The main features of the smart cards are the following: