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#1 2019-09-11 05:21:06

Charlie
Contributor
Registered: 2017-01-27
Posts: 91

Lf search returns two different formats

Hello,

I was wondering if anyone has seen this before?? Lf search comes back as two different formats C15001 and Sie36

proxmark3> lf sea u
NOTE: some demods output possible binary
  if it finds something that looks like a tag
False Positives ARE possible


Checking for known tags:

HID Prox TAG ID: 3f09ea09b4
--------------------------------------------------
       Format: C15001 (HID KeySpan 36-bit)
Facility Code: 245
  Card Number: 1242
     OEM Code: 900
       Parity: Valid
--------------------------------------------------
       Format: Sie36 (HID 36-bit Siemens)
Facility Code: 230645
  Card Number: 1242
       Parity: Valid
--------------------------------------------------

Valid HID Prox ID Found!

Valid T55xx Chip Found
Try lf t55xx ... commands

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#2 2019-09-11 09:19:11

mwalker
Contributor
Registered: 2019-05-11
Posts: 147

Re: Lf search returns two different formats

I expect this will be that the encoded data could be one of those 2. 
Is either correct?

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#3 2019-09-11 12:56:04

marshmellow
Moderator
From: US
Registered: 2013-06-10
Posts: 2,296

Re: Lf search returns two different formats

A lot of HIDs prox formats overlap eachother, making it impossible to tell the exact format just from the binary.

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#4 2019-09-12 13:06:34

grauerfuchs
Contributor
Registered: 2018-08-28
Posts: 45

Re: Lf search returns two different formats

Marshmellow is correct. Since there's a lot of overlap in the vast number of formats out there, the parser attempts any formats it knows to see if it decodes properly and it returns those that do. If there are markings on the card, it might help to identify which format was intended.

Regardless of whether or not one of the two displayed formats was the intended decode, the HID Prox TAG ID line is correct. That is, ultimately, the data that was read from the card.

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