I have a bunch of readers here, and most of them read my EM implants’ UIDs correctly in hex or decimal. But 3 of them report another, totally different UID for the same transponders.
I dumped both implants with my Proxmark3, just to make sure those readers didn’t report some alternate data or data format. But no: those UIDs don’t correspond to anything known, be it in hex or decimal. Yet all 3 readers report the same value.
I have no idea where they get this value from. Any idea?
I might have a hunch…
If you can replicate it with a T5577 card in the same mode as your implant, would you mind sharing the two different UIDs? Obviously and understandably, I’m sure you don’t want to share your implant’s UID.
Don’t let it define you, I’m sure you are still capable of a great many things
Actually, nevermind: I just found out what it was: it’s the DEZ 14/IK2 in hex. Really strange…
This is what the PM3 reports:
EM TAG ID : 2018070085
Possible de-scramble patterns
Unique TAG ID : 0418E000A1
HoneyWell IdentKey {
DEZ 8 : 00458885
DEZ 10 : 0403112069
DEZ 5.5 : 06151.00133
DEZ 3.5A : 032.00133
DEZ 3.5B : 024.00133
DEZ 3.5C : 007.00133
DEZ 14/IK2 : 00137842065541
DEZ 15/IK3 : 000017597202593
DEZ 20/ZK : 00040108140000001001
}
Other : 00133_007_00458885
Pattern Paxton : 538656389 [0x201B3E85]
Pattern 1 : 721425 [0xB0211]
Pattern Sebury : 133 7 458885 [0x85 0x7 0x70085]
This is the mystery UID reported by the 3 readers:
2018070085 (hex)
Sure enough, 0x201807085 = 137842065541. I missed it somehow.
EDIT: No actually I am completely dumb: it IS the base UID. I totally missed the first line of the PM3’s report. Oh wow… I’m really going downhill here…
And I just figured out the UID my other readers report: They say 0403112069 for that transponder, and that’s 18070085 hex - meaning they use DEZ 10 and chop off the most significant byte 
So it was my other readers that reported bull.
Huh, odd.
Glad you figured it out though 