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nfcapdu

NFC Enabled SIM APDU Response 6A 82

I am working on NFC enabled SIM, using ISO-7816-4. While I try to SELECT MF, DF or EF, response is always 6A 82( File not found). Following are the APDUs

00 A4 00 00 02 3F 00 -> To SELECT MF

00 A4 00 00 02 2F E2 -> To SELECT EF

00 A4 00 00 02 7F 20 -> To SELECT DF

Response is always the same, i.e., 6A 82. Am I missing something here? Kindly help.

Solution

  • The problem was not with APDUs, but with the value of SAK. SAK value was set to 0x28. Which means NFC enabled SIM supports both;

    1. CPU level APDUs (the one I was trying to communicate to) and
    2. Mifare 1k sector (the one I should have tried to communicate to in the first place).

    However CPU level APDUs had more priority than Mifare sector because of which my NFC reader/writer was unable to communicate to Mifare 1k sector. Once the value of SAK was changed to 0x08, it disabled CPU level APDUs and my NFC reader/writer was able to communicate with the Mifare 1k sector. Hope this helps.