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Contactless IC cards have no mechanical contact with the reader, avoiding various malfunctions caused by contact reading and writing. For example, malfunctions can result from rough card insertion, the insertion of foreign objects, or poor contact due to dust or oil. Furthermore, contactless cards have no exposed chips, eliminating concerns about chip detachment, electrostatic discharge, or bending damage. This simplifies card printing and improves card reliability.
Because of contactless communication, the reader can operate on the card within a 10cm range, so there is no need to insert or remove the card, which is very convenient for users. Contactless cards are not directional when used; the card can be swept across the reader surface in any direction to complete the operation, which greatly improves the speed of each use.
Contactless cards have a fast anti-collision mechanism that prevents data interference between cards. Therefore, the reader can process multiple contactless IC cards "simultaneously". This improves the parallelism of the application and thus increases the system's operating speed.
The serial number of a contactless IC card is unique. The manufacturer has fixed this serial number before the product leaves the factory, and it cannot be changed.
The contactless card and the reader adopt a two-way verification mechanism, that is, the reader verifies the legitimacy of the IC card, and the IC card also verifies the legitimacy of the reader.
Before processing, contactless cards undergo three mutual authentications with the reader, and all data is encrypted during communication. In addition, each sector of the card has its own operation password and access conditions.
The memory structure of contact cards allows them to be used in multiple ways, applicable to different systems, and users can set different passwords and access conditions according to different applications.
