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#1 2017-02-12 15:53:54

ltq1990
Contributor
Registered: 2017-01-12
Posts: 25

Reading different results from an Indala tag

Hi guys, today I try to read a Indala tag but got different results.

here are the results:

proxmark3> hw tune
Measuring antenna characteristics, please wait......#db# DownloadFPGA(len: 42096)                 
.         
# LF antenna: 30.66 V @   125.00 kHz         
# LF antenna: 31.49 V @   134.00 kHz         
# LF optimal: 37.26 V @   129.03 kHz         
# HF antenna: 29.10 V @    13.56 MHz         
Displaying LF tuning graph. Divisor 89 is 134khz, 95 is 125khz.

proxmark3> lf search
Reading 30000 bytes from device memory
Data fetched         
Samples @ 8 bits/smpl, decimation 1:1           
NOTE: some demods output possible binary
  if it finds something that looks like a tag         
False Positives ARE possible
Checking for known tags:
BitLen: 224         
Indala UID=00000000000000000000000000000111100010010100100001011110010011101110100010110111011101001110011100010001010101100100101110101110011001001000011110101000101111100001110101110100010000000111000110010101110100010000111010101001 (789485e4ee8b774e711564bae6487a8be1d74407195d10ea9)         
Valid Indala ID Found!   


proxmark3> lf search
Reading 30000 bytes from device memory
Data fetched         
Samples @ 8 bits/smpl, decimation 1:1           
NOTE: some demods output possible binary
  if it finds something that looks like a tag         
False Positives ARE possible
Checking for known tags:
BitLen: 224         
Indala UID=00000000000000000000000000000111100010010100100001011110010011101110100010110111011101001110011100010001010101100100101110101110011001001000011110101000101111100001110101110100010000000111000110010100001011101111000101010110 (789485e4ee8b774e711564bae6487a8be1d744071942ef156)         
Valid Indala ID Found!         

I tried cloned different IDs into T5557 cards, it turned out the second one is the real ID. I don't understand how did it happen, does it have something to do with its irregular shape of the tag ?

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#2 2017-02-12 16:00:25

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: Reading different results from an Indala tag

You're signal must be weak, it missed one phase shift on the first demod.  With tagdata that long you need good strong signal.

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#3 2017-02-13 08:11:50

ltq1990
Contributor
Registered: 2017-01-12
Posts: 25

Re: Reading different results from an Indala tag

marshmellow wrote:

You're signal must be weak, it missed one phase shift on the first demod.  With tagdata that long you need good strong signal.

I think my atena works without any problems. Another thing is when I use pm3 to read the cloned tag, it can correctly reads the ID without any fails, however pm3 still fails to read the id sometimes or get different results

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#4 2017-02-13 14:35:11

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: Reading different results from an Indala tag

Is the original tag a keyfob or smaller tag?

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#5 2017-02-14 05:51:34

ltq1990
Contributor
Registered: 2017-01-12
Posts: 25

Re: Reading different results from an Indala tag

the original tag is in a bullet-alike form and the chip is a small piece attached to the end of bullet, so yea the original tag is smaller

marshmellow wrote:

Is the original tag a keyfob or smaller tag?

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#6 2017-02-14 07:21:23

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: Reading different results from an Indala tag

That is probably why you are getting the results you are.  Smaller tags tend to work better with small focused antennas not the general all around antennas that typically ship with the pm3 kits.

The tag it always works for is a larger tag?

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#7 2017-02-15 01:45:43

ltq1990
Contributor
Registered: 2017-01-12
Posts: 25

Re: Reading different results from an Indala tag

marshmellow wrote:

That is probably why you are getting the results you are.  Smaller tags tend to work better with small focused antennas not the general all around antennas that typically ship with the pm3 kits.

The tag it always works for is a larger tag?

I think the other result I was getting is false positive maybe.

However most of the times the false positive I got previously from that atena is like loads of zeros with an ID of few zeros

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#8 2017-03-30 08:45:25

Dot.Com
Contributor
From: Hong Kong
Registered: 2016-10-05
Posts: 180
Website

Re: Reading different results from an Indala tag

The tag isn't a 224 bits that why. Use the build envt to demod the tag. you will get a fix result. smile

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#9 2017-03-30 13:10:57

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: Reading different results from an Indala tag

@dot.com,. Not sure what you are trying to say...  his tag WAS 224 bits long. it was a long format indala tag.

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