Basic knowledge about dual-interface cards

The dual-interface card is a smart card based on a single chip that integrates contact and Non-Contact Interfaces. It has two operation interfaces for Chip access, you can access the chip either by means of contact or by means of RF. There is only one chip on the card, and two interfaces can perform the same operation through both the contact interface and the non-contact interface.

There are three types of Dual-interface cards:

1. The contact smart card system and the non-contact smart card system are physically combined into a card. The two EEPROM systems are independent of each other.
2. The contact smart card system and the non-contact smart card system operate independently of each other, but some storage space in the shared card.
3. The contact smart card system is fully integrated with the non-contact smart card system. The contact type and non-contact operation status are the same and share one CPU management.

Among the three dual-interface IC cards, only the last dual-interface IC card is the real non-contact dual-interface CPU card.

Advantages of Dual-interface cards

1. High Security
Chip security: internal tapeRandom Data GeneratorChip to prevent physical and logical attacks.ProgramCodeCos, once written, cannot be reproduced; each chip has a unique Factory Code. Operating System Security: supportedSingledes and tripledesAlgorithm: The singledes or tripledes algorithm can be automatically selected based on the key length. SupportedLine EncryptionAnd protection functions to prevent illegal theft or tampering of communication data. Multiple key types support different key usage methods. Transmission Security: Non-contact data transmission follows the relevant transmission protocol. After encryption and processing of cards and machines, data will not be leaked even if it is intercepted.

2. Fast transaction
The chip contains the des computing accelerator, which can quickly complete algorithms such as singledes and tripledes. A single tripledes operation takes 130 microseconds. In non-contact communication, the communication transmission rate is106 KBPS; the communication rate of the contact part can be adjusted, and the communication rate can reach bps.

3. One-card multi-use and one-card use
CARDS support multiple applications: A card can be integrated with multiple different applications, multiple industries, and multiple applications for simultaneous card issuance. Flexible and convenient applications. Use of contact or non-contact transaction methods To reduce operating costs; applicable to trial environments with large transaction volume, short transaction time, and no waiting for the transaction process; Fully Closed equipment, applicable to harsh working environments and self-consumption sites, strong anti-destruction and anti-interference capabilities; suitable for systems with high security requirements and can be used as financial electronic wallet applications; card anti-conflict mechanism, allowing multiple cards to enter the trading zone at the same time; fully compatible with traditional contact devices, it can be used directly.


4. Good compatibility
Meets the requirements of China Financial integrated circuit (IC) card Specification; complies with Type A in the standard, and later based on Siemens chip dual interface card supports type A or type B. Currently, the application supports Mifare-I card reading and writing. You only need to upgrade the software to easily read and write the Mifare-Pro type timecos/di that supports type.

5. Dual interface CPU card encapsulation process description
As a new technology, dual-interface CPU card has special requirements for card encapsulation. Currently, two packaging processes are used: Laminated and Injection Molding . Compared with common contact cards, the dual-Interface Card adds a set of antennas and increases the difficulty of card encapsulation. Currently, the dual-Interface Card encapsulation process has some problems: an antenna is a medium for Energy Transfer and communication between a chip and a read/write machine in a non-contact mode. Generally, in encapsulation, the contact between the antenna and the chip is connected by conductive rubber, due to the process and Conductive Rubber problems, the connections between some card antennas and contacts are unstable, and the dual interface is often stuck after encapsulation is complete or used for a period of time, the non-contact interface does not work normally. In application testingEncapsulation Problems The proportion of non-contact card interfaces that cannot work normally accounts for the majority of card failure rates. The company adopts a unique encapsulation technology in the encapsulation of Dual-interface cards to solve the problem of dual-interface cards. Connection between antennas and Contacts Makes the connection between the antenna and the contact more solid and reliable. Due to the application of this technology, the encapsulation yield rate of the dual interface card and the failure of the non-contact interface in use have been greatly reduced.