Savi’s Custom Lightsabers and Dok’s Holocrons all work with kyber crystals via low frequency (LF) RFID. The kyber’s themselves have EM4305 RFID chips, which work via Passive RFID. Unlike Active RFID, they have low range and do not have any power themselves, but they’ll “power up” when near an RFID reader and start sending their data. I had done a basic Arduino tutorial or two in the past with some of the high frequency (HF) RFID tags, but this was my first time really having some serious hands-on with set goals:
To learn what data is on the crystals, what is being sent to the sabers/holocrons, and can we change the data?
We’ve always had an interest in seriously learning more about RFID, so this was a great excuse. The only RFID readers we had on hand were really basic HF Arduino sensors, so we ordered a very basic Proxmark model to really get started.
Using the Proxmark, I was able to read all the data on the kyber and also confirm the RFID chip model.