IC cards are capable of guarding against magnetism and static electricity, combating vandalism, providing long term durability, beating card fraud and securing the stored data (encryption is also possible). The data storage capacity is big. The cost of application equipment and network system environment is low. There is a complete set of varieties of models. Technologies and characteristics are matured. People begin to treat its extremely high security seriously. IC cards have already replaced both the magnetic stripe cards and other data storage cards in a widespread of areas. 　　Contactless IC cards are also called radio frequency (RF) cards. This new technology was developed in recent years around the world. When you place the card near the reading area of the card reader, the read and write operation can be applied on the data stored in the card. It successfully combines both the RF recognition technologies and IC card techniques together. It is a break through to solve both of the problems in the electronic device domain by supporting powerless (no power source in the card) and contactless. Compared with the contact IC cards, contactless IC cards have the following merits.