Introduction to MIFARE smart card technology
Q: What is MIFARE?
A: MIFARE is a 13.56MHz non-contact identification technology owned by Philips Electronics. Philips does not manufacture cards or card readers, but sells related technologies and chips in an open market. Manufacturers of card and card readers use their technology to create unique products for the average user. MIFARE is often considered a smart card technology because it can read and write on a card. In fact, MIFARE only has a memory function, and must be matched with a processor card to achieve read and write functions. MIFARE's contactless reading and writing capabilities are designed to handle the paid transactional part of the mass transit system. What sets it apart is the ability to perform ascending and descending sorting functions to simplify the process of reading data. Although contact smart cards can perform the same actions, non-contact smart cards are faster and easier to operate, and the card reader requires almost no maintenance and the cards are more durable.
Q: In general, how many card reading distances can a MIFARE contactless smart card reader have?
A: Card Reader for Smart Cards The standard reader distance for card readers for MIFARE contactless smart cards is 1.0å‹ to 3.9å‹ (ie 2.5 to 10 cm). In North America, due to FCC (electricity) restrictions, the card reading distance is about 2.5 cm.
Q: How many blocks and uses does a MIFARE card have?
A: A MIFARE card has 16 separate blocks that can be designed to be stored in an electronic wallet or other material. The first block is usually used as a directory for the rest of the card, and the remaining fifteen blocks are available for data storage or e-wallet. Therefore, MIFARE can provide at least 15 different applications, and since each block has a separate key (password), these 15 applications can be separated; the only condition is the supplier of various uses. Must be able to cooperate with the MAD (MIFARE Application Directory) of this technology. MAD refers to a table of contents stored in each card. Philips assigns a unique application ID code to each vendor and integrator. The card reader then scans the MAD to search for a specific application ID code and then goes directly to the corresponding block to read the data; this way is better than looking for the entire card. It is much faster to read the required information.
Q: Can MIFARE data be encrypted?
A: MIFARE data cannot be encrypted. In general, to encrypt data requires a card such as a cryptographic processor; in other words, the user needs to use a module of the contact smart chip instead of the MIFARE non-contact technology. However, MIFARE's technology does allow for mutual identification between the card and the card reader: first, a random number is generated, and then the message is transmitted from the card to the card reader according to the key, and the card reader then repeats the same procedure to the card, so Going back and forth three times to identify the card that was handed out is valid.
Q: How does MIFARE work on the door?
A: Although MIFARE's card reading distance is short and it is not suitable for access control applications, it is often used in the access control market due to its multi-card use characteristics, and there is an increasing trend. In large venues, MIFARE can be used as an access card, a self-service restaurant's stored value card, an ID card, a punch card for work, a parking fee card, a library or equipment rental card, or a vending machine's stored value card; The personal biometric feature values ​​can be stored for verification by the biometric card reader. Perhaps someone will want to buy a card reader and a card reader that is disabled because of MIFARE's future development, but these people must purchase a programming/setting card and card reader. MIFARE is very popular in Europe and Asia and is designated in the United States as an administrative and naval access control device.
Q: If the consumer already has a MIFARE card for the access control system or other applications, is there a feasible solution for integrating the two types?
A: Many customers are currently using proximity cards as access control, and others hope to use MIFARE technology for e-commerce. Since the customer wants to bring only one card to the body, it is natural and reasonable to combine the above two techniques on one card. The current trend is to use MIFARE on an induction access control system. For example, HID customers must have HID card readers and then use HID MIFARE card programmer to program the HID access control data into the unused card blocks. All or part of the 32-bit Card-Select Number (CSN) is converted to the Wiegand version for access control (although most access control systems cannot handle more than 4 billion random numbers). A dual-frequency card product has been available on the market that includes 125 kHz and 13.56 MHz MIFARE chips and antennas. When used with a 125 kHz reader, it provides a long, readable range and is complemented by an additional flexible design with MIFARE 13.56 MHz.
Q: If using the MIFARE non-contact smart card reader to the existing access control system, is there any technical focus that needs special attention?
A: The MIFARE non-contact smart card reader can be used on existing access control systems. Here are some technical points to note: The standard MIFARE card is a unique 32-bit serial number programmed by Philips Electronics. Random numbers without the password of the facility. If the user's current access control system uses another bit type and also wants to use the MIFARE 32bit non-contact card or card reader, then the user should determine that the access control system can accept multiple bits at the same time. Type and facility password. Alternatively, the user can order a MIFARE card in particular, and it has the same bit pattern and pre-programmed available blocks as the existing system. In this way, the existing access control system can simultaneously read the proximity card and the MIFARE card. Another point to note is that you must install the card reader with the bit pattern so that the card reader can read the data normally. According to which ISO specification? Q: Which ISO specification is the MIFARE card based on? A: MIFARE is a 13.56MHz non-contact technology, part of ISO
14443 Type A. This card is designed to be embedded into a template of an optional contact smart chip; once completed, it is compatible with ISO 7816. In addition, the card has a magnetic strip design that makes it compatible with ISO 7811.
Q: Since both MIFARE and proximity cards come from non-contact technology, what are the similarities and differences between them?
A: The same place is as follows:*
All are automatic cards (no battery required)*
Composed of a chip and a coiled antenna*
Can be obtained from ISO deck, fobs, disk*
RF energy can be used to activate the chip and send and receive data.
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