Smart card equipped with a CPU and RAM, can handle a large number of their own data to the host CPU does not interfere with the work. Smart cards can also filter the wrong data, in order to reduce the burden on the host CPU. Number of ports adapted to demand more and faster communication speed of the occasion. 
 Smart cards are IC cards (IC cards) one, according to the different types of embedded chips, IC card can be divided into three categories: 1. Memory cards: card IC are available consumption erased programmable read-only memory EEPROM, it is only a data storage function, no data processing capabilities; memory card itself has no hardware encryption, file encryption only, it is easy to crack. 
 2. Logical encryption card: The card includes encryption logic integrated circuits and programmable read only memory EEPROM, encryption logic circuits can be protected to some extent, the data card and the card security, but only low-level protection can not prevent malicious attacks . 
 3. Smart card (CPU card): IC card including the central processor CPU, programmable read only memory EEPROM, random access memory RAM and ROM is fixed in read-only memory card in the operating system COS (Chip Operating System). Card reads the data into external and internal processing part, to ensure that the card data safe and secure.