Yours will obviously be different, but you get the idea. SCR35xx USB Smart Card Reader” so I’ll jott down Bus 2 device 10. The reader I want to use is the “SCM Microsystems, Inc. Here you can see I have a Smart Card reader on Bus 1 device 03 and another on Bus 2 device 10.

Ok, that’s all the prerequisites sorted, next we need to find the bus and device ID of our smart card reader, We’ve got to get some permissions setup, sudo adduser $USER wiresharkįollowed by a reboot to take effect, then we’ll run these two commands, which will need to be run each time we want to capture USB traffic: modprobe usbmon If you want to see what’s being sent between your phone and SIM card, the Osmocom SIMtrace is the device for you (And yes it also uses Wireshark for viewing this data!).

While we’re working with Smart Card readers and SIM cards, capturing and Decoding USB traffic to see what APDUs are actually being sent can be super useful, so in this post we’ll look at how we can use Wireshark to sniff the USB traffic to view APDUs being sent to smart cards from other software.įor the purposes of this post I’ll be reading the SIM cards with pySim, but in reality it’ll work with any proprietary SIM software, allowing you to see what’s actually being said to the card by your computer. I never cease to be amazed as to what I can do with Wireshark.

Sniff traffic