My office building uses HID ProxCard II badges (at least that’s what’s printed on them) for access, and from what I’ve been reading I should be able to use the DT xEM Transponder with this, but I want to take small steps before getting an implant – particularly after reading how the xEM Cloner can garble the password on the chip.
I’ve done a fair bit of research, but I still have quite a few questions I’m hoping people here can answer.
Are there any wearables I could try out before getting an implant that would work for HID? I’m thinking ring or bracelet. Most of what I’ve found seems to be HF stuff (like the NTAG213), and from what I understand ProxCard is LF - 125kHz. TrossenRobotics has an LF RFID ring (http://www.trossenrobotics.com/rfid_ring) but almost no specs on it. It also indicates it is read-only, which seems odd.
It sounds like HID and EM41xx are different modes for transponders. Are these different data formats, or different communication protocols? Would an EM4102 device not work with an HID ProxCard II reader? What do I need to look for to guarantee a transponder would work with my building security system?
Assuming the xEM Cloner is a no go, what other options are there for cloning the data from my HID card? Should I hack together my own reader/writer? How much data would I need to copy for an HID ProxCard? Just a multi-byte ID? I read somewhere that the ProxCards have 137 billion unique codes; that sounds like a 37 bit number. I’ve also read about a 26-bit format. Are these both actually a fixed-length format (e.g. 64 bit) with some extra flags / reserved bits? I can’t find any documentation on what’s stored on the ProxCard. Anyone know where to find out more?
Thanks in advance for any guidance!