What is the principle of access card elevator card? Can you copy it?

There is a microstrip antenna coil in the interlayer of the card. When approaching the access control host, the antenna senses the signal of the access control host and generates an induced current, which is provided to the chip in the card as a power supply. The chip in the card starts to work after receiving the power supply, and wirelessly communicates with the access control host through the antenna for authentication. If the authentication passes, the door or gateway will be opened, and if the authentication fails, it will remain locked.

According to the different chips inside, there are ID cards and IC cards. The ID card only records a simple ID, and the main data is stored in the access control host. As long as the ID is correct, the authentication will pass. If IC card is used, communication will be encrypted, and the signal coding data of each communication interaction is different, which can prevent unauthorized cloning of the card.

Extended data:

Access card classification

1, according to the shape

According to the shape, it is divided into standard cards and special cards. The standard card is an international uniform size card, with the size of 85.5 mm× 54 mm× 0.76 mm Nowadays, due to the personalized demand, printing is not limited by size, which leads to many kinds of "weird" cards in various countries around the world, which we call special-shaped cards.

2. By card type

Magnetic card (ID card): The advantage is lower cost; One card per person, generally safe, can be connected to a microcomputer, and has a record of opening the door. The disadvantage is that the card and equipment are worn and the service life is short; Cards are easy to copy; Both directions are difficult to control. Card information is easily lost due to external magnetic field, which makes the card invalid.

Radio frequency card (IC card): the advantage is that the card has no contact with the equipment, and it is convenient and safe to open the door; Long service life and theoretical data of at least ten years; High security, can be connected to a microcomputer, and has a door opening record; Can realize bidirectional control; Cards are difficult to copy. The disadvantage is that the cost is higher.

3, according to the card reading distance

Access to the access card, the access card must be in contact with the access card reader to complete the task.

Induction access card, access card can complete the task of swiping the card within the induction range of the access control system.

References:

Baidu encyclopedia-access card