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What is the use of smart cards? In terms of functionality, the use of smart cards can be grouped into the following four points: 1. Identification - using embedded microcomputer system data to make mathematical calculations confirm its uniqueness. 2. Payment instrument - built-in counter (counter) as an alternative currency, bonus points, and so on, the number of font data. 3. Encryption / decryption - the case of the rapid development of Internet, e-commerce usage has substantial growth, some manufacturers said that the most important is the network consumption authenticity, data integrity, non-repudiation and legality of the transaction, by password mechanism such as DES, RSA, MD5, etc., in addition to increase card security, but also off-line operation, in order to reduce the communication cost network. 4. Information - Due to the popularity of GSM mobile phones, SIM cards increased demand, accelerate the development of smart card technology, making the mobile phone from the original simple telephone functions, extending to today's Internet connection and other functions. Its information storage function, it has a wide range of commercial applications such as: personal financial records of bank competition is becoming fierce, to improve customer loyalty and attract new customers to join, the banks plan to launch a variety of bonus offers, and improve customer service system, and by using smart cards, not only to achieve a 24-hour free transfer functions, and can reduce the bank staff and written operating procedures time customers. Currently on the market there are many banks to issue smart cards, while MasterCard and VISA credit card group is also about the renewal of the two smart cards. Once the medical records of the health insurance IC card, personal medical records can be stored in the chip, regardless to that hospital for treatment, can learn personal medical condition, the physician can record that patients seek medical attention immediately, the patient may also be exempt from the report filled time and reduce hospital medical records maintenance costs. In addition, national ID card can be an IC, and all personal identification information such as fingerprints, birthdays, personal files stored in the chip, but also as a passport using, Singapore and Malaysia, the government has started. Access control access control for businesses and schools, very important, smart cards can be used in addition to general access control, can also store small amounts, co-consumption and the general store to improve the functionality of the card, such as a British manufacturer of access control systems will Originally used in the access control smart cards will also be used in ATM, it combines access control and electronic purse functions.