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ml at mail.tsaitgaist.info ml at mail.tsaitgaist.infoAFAIR the wireshark dissector only knows about the SIM RUN GSM ALGORITHM APDU format (with Kc), but not the USIM AUTHENTICATE APDU format (with CK and IK). https://github.com/wireshark/wireshark/blob/master/epan/dissectors/packet-gsm_sim.c#L1618 This is why it should always return a malformed packet (due to the dissector decoder). Did you check if the raw bytes actually match the USIM APDU and include CK+IK, or are bytes also missing there? On Tue, Dec 13, 2016 at 09:22:13PM +0800, joranglequeen at sina.com wrote: > Dear Sir or Madam: I've bought two simtrace development boards two months ago in order to research the communication between the SIM-card and the mobile phone. However, recently when I need to analyse the packet which contains CK and IK, I sadly found that the packet was not captured every time. Mostly it returns as a malformed packet in the wireshark, which blocks my future studying. I read the user manual and it says that for some high speed cards the firmware can lose bytes, and to solve that we can reduce the size of the buffer. So I'm writing to ask the specific steps to reduce the buffer and recompile the firmware, and I've tried by myself but I couldn't find a proper toolchain which includes a GCC but not an EABI. I'm looking forward to your reply. Best wishes! Yours, sincerely Luna-Qi