I’ve been playing with my new proxmark3. It works great for HID cards, but ioProx code is still in its infancy. I made some improvements to it based on analysis by marshmellow:
- Better accuracy: You no longer have to worry about centering your fob on the antenna or scan it repeatedly to get a “good” reading. Now you can just hold it in your fingers to scan. Before this update I was averaging 10 – 70% accuracy depending on how I held the fob. This version is pretty much 100% – I haven’t had a bad scan yet.
- Correct decoding of human readable XSF number: Previous version had a bug that displayed the wrong unique code and the wrong facility IDs.
Download the binary firmware (including source code patch if you want to build it yourself) .
There is still more work to be done. For example, there appears to be CRC or checksum near the end – it’s still a mystery.