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StringBuilder hex = new StringBuilder(8)
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_receivedData += _serialPort.ReadExisting() īyte data = (receivedData) Private void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e) If (_serialPort != null & _serialPort.IsOpen)īyte data = StringToByteArray(message) _serialPort.DataReceived += SerialPort_DataReceived Public MifareCardReader(string comPort, int baudRate) I implement this protocol in C# as follows: private SerialPort _serialPort = new SerialPort() Where 46 ff a6 b8 is the card serial number in the above response. We have supplied lots of information about RFID cards as part of this open source project.With the card reader I'm using, the protocol to retrieve the serial number of a MIFARE card is as follows: I have implemented an Arduino (Particle) card reader/writer with a PN532 based RFID board. I haven't used the AI2 NFC component, but if you can read and write blocks on a Mifare Classic 1 K card, then you can read the manufacturer card UID in the same manner. Writing your own UID data to some other block in any other sector and changing the encryption keys and access controls for that sector are the only way to ensure the authenticity of a card that you issue to users. The terminal uses the UID to select the card that it wants to communicate with (in the event that multiple cards are activated in the near field of the terminal). They are intended only for use in the anti-collision step of reading/writing a card. Therefore, UIDs are not secure, and are not guaranteed to be unique. Note that some Chinese manufacturers sell cards where block 0 sector 0 is overwritable, so it is possible for people to use such a card to emulate other cards. The default encryption key of 0xFFFFFFFFFFFF s used to authenticate this block for reading. However, most manufacturers make this block read-only and you can't overwrite the UID like you can overwrite data in any other block. There is no difference between reading this block and any other block of the card. Ultralights use the same block and use a 7 bit UID,Ī block holds 16 bytes of data and the remaining bytes of block 0 sector 0 are reserved for manufacturer specific information. The UID is either 7 bytes long (for newer cards) or 4 bytes long (for older cards). To the best of my knowledge, Mifare Classic 1K cards use block 0 of sector 0 to hold the card UID.
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