NFC cards are mainly divided into two categories, ID cards and IC cards. ID cards are mainly being read data by NFC reading devices; IC cards have chips that specifically process card data.
ID card: only record the card number, the card number can be read without limitation and it is easy to be imitated. The ID card cannot write data, and its record content (card number) can only be written once by the chip manufacturer, and the developer can only read the card number for use, and cannot formulate a new number management rule according to the actual needs.
IC card: The reading and writing of the data recorded in the ID requires corresponding password authentication, and even each area in the card has different password protection to fully protect data security.The permission of reaing and writing can be set with different password , which provides a good hierarchical management method to ensure system security. The IC card can not only read a large amount of data by authorized users, but also write a large amount of data (such as new card number, user authority, user information, etc.) by authorized users.
What are the different types of IC cards?
M1 card: ordinary IC card, sector 0 cannot be modified, other sectors can be erased and rewritten repeatedly; usually the access control cards and elevator cards that we use are M1 cards. The M1 card is an IC card developed by NXP, the full name of which is NXP Mifare1 series. At present, the NFC chips used by most mobile phone manufacturers are NXP.
UID card: ordinary copy card, can repeatedly erase and write all sectors, the access control is invalid if there is a firewall.
CUID: Upgrade the copy card, which can erase and write all sectors repeatedly, and can penetrate most firewalls.
FUID: Advanced copy card, 0 sector can only be written once, and it becomes a M1 card after writing.
UFUID: Super advanced copy card, 0 sector can only be written once, after the card is sealed, it will be a M1 card, and if the card is not sealed, it becomes a UID card.
IC cards follow the concept of early chip contact cards, and are currently divided into contact IC cards and non-contact IC cards. Contactless IC cards belong to the category of RFID, and currently refer to high-frequency IC cards. The most commonly used is the M1 card and its compatible cards.
The difference between Mifare series cards
1) Mifare series cards are divided into Mifare UltraLight, also known as MF0, according to the different chips used in the card;
2) Mifare S50 and S70, also known as MF1;
Mifare Pro, also known as MF2, Mifare Desfire, also known as MF3. Mifare 1 has a password, Mifare UltraLight has no password. M1/ML/UtralLight/Mifare Pro comply with 14443A protocol, AT88RF020 comply with 14443B protocol
Differences between Mifare S50 and Mifare S70:
1) The reader/writer sends different request commands to the card;
2) The card type (ATQA) bytes returned by the response are different. The card type (ATQA) of Mifare S50 is 0004H, and the card type (ATQA) of Mifare S70 is 0002H;
3) The capacity and memory structure are different, the capacity of S50 is 1K bytes, and the capacity of S70 is 4K bytes.
At present, NFC cards are mainly used in access control identification, bus cards, pesonal information Identification, anti-counterfeiting, etc. Handheld-wireless handheld pda can support NFC card reading and writing, Shenzhen Handheld-wireless Technology Co., Ltd. provides various RFID reader writer, NFC handhelds, barcode scanners, biometric handhelds, electronic labels and customized application software, etc.