1. Introduction to RF card 

Radio frequency cardRFCard, also called contactlessICCard is a kind of integrated circuit card which transmits data by wireless way. It has the unique advantages of data processing and security authentication,It successfully integrates RFID technology withICThe combination of card technology solves the problem of passive and contactless, which is electronic deviceA breakthrough in the field of components. Due to the presence of magnetic card and contact typeICThe incomparable advantages of cards make one of them immediately attract wide attention and be popularized and applied at an amazing speed.

2. structure

RF card8KpositionEEPROMDivided into16Sectors, each sector consists of four blocks, each block consists ofSixteenByte. Three of the four blocks in each sector(Fourth pieces)包With this sectorKEYA(Sixbyte)、access control(Fouraccess control)andKEYB(Sixbyte)，The remaining three block data blocks. stayZeroBlock to 63block，0The block is a solidified block, in which there are special contents such as manufacturer code. It is widely used in identity authentication, credit authentication, automatic control, security and other fields. Its security, confidentiality and practicability are incomparable to all kinds of general defense circuits at present。

3. Principle of RF card

Information. Its basic working principle is not complicated. After the tag enters the magnetic field, it receives the RF signal sent by the reader and sends the energy obtained by the induced current to the chipThe product information in, or the signal of a certain frequency sent by the tag, is read by the reader and decoded, and then sent to the central information system for data processing.