This is going to be a weird one so not sure anyone will be able to help but hopefully someone can make sense of it,
I have a clock system that uses125khz HID fobs, I am able to clone these to a T5577 without issue using lf hid clone -r 95156014605 for example will create a fob with the number 15601460 and this will work fine.
I am trying to create additional fobs and i am having some issues, the cards atr is ATR: 3B051415601460 using a omikey5427 with pacsprobe which would mean it should be a H10320 (C&D) format fob but proxmark gives me this when i read it,
its these clock machines that are used in work for clocking in/out
they will read pretty much any hid fob and a few others when configured to.
the issue I had was the software that collects the data can only handle the 8 digit card numbers so I needed to either find a supplier who could supply pre-coded fobs or find a way to program them myself, one supplier wanted £8 per fob and wouldn’t even send a sample to make sure it worked…
so began my trip down the rfid rabbit hole, once I knew I could clone the fobs I knew there would be a way to write any fob number I wanted, I was originally brute forcing my way through programming every combination to a fob then find the fob that worked repeat until I had enough fobs.
I think I’m getting a better grasp of how it all works now, I hadn’t figured that it would be being done on a binary level…
so lucky guess or not, its very much appreciated, I just tested a completely different number combination and it worked first time