IC card entrance guard system of wireless communication encryption technology (1)

As technology advances, access control system is gradually being guarded by the old guard, and the key to open the door to the present non-contact card access control management system.

Non-contact smart card entrance guard management system, than other access control products and a more advanced technology, stable and reliable, performance-cost ratio and other prominent advantages, can be widely used in various industries. In the IC card application increasingly widespread today, IC card entrance guard system to its access management of secure, reliable, efficient, flexible, convenient, has gradually replace other existing types of door locks, become the mainstream of the entrance guard system. 1 entrance guard system introduction

Access control, also called access-control system.

Is a kind of management personnel access digital management system with intelligent, the advent of the digital information society ", card" has been gradually into the aspects of life, there is a step by step to the card, but also gradually without the card, it is no exaggeration to say that mankind will move towards the "card" in the world. Card is the realization of intelligent management and automated management of an important means.

In case you need to control personnel access locations, such as periodic movement of laboratory staff, hotel rooms, there are special requirements for secrecy etc., if you use the card to open the door, replace the traditional pass and the keys that allows management of automation, intelligent.

Not only the users ' convenience, managers are also convenient, but productivity and security can be greatly improved. These environment-friendly IC card entrance guard system is a secure, reliable electronic door lock system. Using this system, you can easily manage and control the application site access, identify access officer's identity and access permissions.

2 wireless communication (induction) IC card entrance guard system working principle

Induction technology, or known as radio frequency identification (RFID) technology, is a card and card reader device without direct contact between the information on the card can be read.

Use the induction card reader, no longer will contact friction resulting from the card and card reader equipment wear, and no need to put the card into the hole or slot in the magnetic card, the card just in the reader's card range swaying.

In the induction technology application, the reader continues through its internal coil produces an electromagnetic field, the 125kHz magnetic field called "fire signal".

When an induction card in the card reader, card within range of the stimulation coil in the "signal" induction under a weak current, as a small ASIC in the card's power, but the card's integrated circuit manufacturing inventory have entered when the only digital valve s number (ID), the number from the card via a modem signal transmission 62.5kHz back to the reader, the signal is called a "reception". Reader will receive a wireless signal back to the controller, the controller is processing and checking and conversion into digital signals, controller and then put this digital valve identification number (ID) to the controller of the microprocessor, it made access decisions.

3 wireless communication IC card entrance guard encryption

RF IC card and reader of mechanical contact between right and wrong, RF IC card is especially suitable for high-traffic through the access control system.

RF IC card and card reader between radio communication technology to communicate, and radio waves in space is an open, easily be intercepted, therefore normal outside w/o CPU logic encryption RF IC card resistance not the simplest password attacks, communications can easily be theft, tampering, and counterfeit copy, its security, or even better than ordinary logic encrypted contact IC card.

3.1 DES algorithm encryption technology

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