Use RFID UID as Authentication Key For sectors and blocks

Using Arduino Project Guidance
1

Hi

I am working on a project using RFID and it is based on Writing Data to Sectors and blocks and later read them which shows the details of card owner which is simple.

For now i am using My own Key for Encrypting it but would like it more secure and

would like to use the the first 6 Bytes of the UID as Authentication Key from sector 0 Which is Encrypted by my own key so please help me on this whenever i try to read the block 0 and get the string they are just random characters

so please help me get this project working as soon as possible

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Controller, code and wiring please. My chrystal ball is out of service.

3

Railroader:
Controller, code and wiring please. My chrystal ball is out of service.

I am using a Uno and a MFRC522 RFID Reader and i wrote this simple code i tried yesterday but i guess i may fail cause i got Authentication failed error

  byte buffer6[18];

  block = 0;
  len = 18;

  //------------------------------------------- GET FIRST NAME
  status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, block, &key, &(mfrc522.uid)); //line 834 of MFRC522.cpp file
  if (status != MFRC522::STATUS_OK) {
        unknown();

    Serial.print(F("Authentication failed: "));
    Serial.println(mfrc522.GetStatusCodeName(status));
    return;
  }

  status = mfrc522.MIFARE_Read(block, buffer6, &len);
  if (status != MFRC522::STATUS_OK) {
    Serial.print(F("Reading failed: "));
    Serial.println(mfrc522.GetStatusCodeName(status));
    return;
  }

String Key = "";
  //PRINT FIRST NAME
  for (byte i = 0; i < 18; i++) 
  {
     Key.concat(String(buffer6[i] < 0x18 ? " 0" : " "));
     Key.concat(String(buffer6[i], HEX));
  }
        Key.remove(18);
        Key.toUpperCase();
        Key.replace(" ", ", 0x");
        Key.remove(0, 2);
   Serial.print("Key: ");
         Serial.print(Key); 

  Serial.println();
  
  if (Key.length() > 0) {
  byte inArray[6];
  char * tokens;
  char key_array[Key.length()];
  Key.toCharArray(key_array, Key.length());
    int i = 0;    
    tokens = strtok(key_array, ", ");
    while (tokens != NULL) {
        inArray[i] = atoi(tokens);
        tokens = strtok(NULL, ", ");
        i++;
    }
    inArray[0] = key.keyByte[0];
    inArray[1] = key.keyByte[1];
    inArray[2] = key.keyByte[2];
    inArray[3] = key.keyByte[3];
    inArray[4] = key.keyByte[4];
    inArray[5] = key.keyByte[5];

  }
4

That does not look like the entire code.
Where is the mrfc522.begin() ?

5

Railroader:
That does not look like the entire code.
Where is the mrfc522.begin() ?

I know but after a night less sleep i figured it out and i wanted to keep this project as private as possible as it is for a commerical product and and the code i presented before was which gives out the unique key for each card

So thanks for responding for it

Thank You So much

6

Okey, You're up and running. Note that all helpers do this without getting paid, without commercial interests, and the intention of Forum is to help new members getting ahead…...

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