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#1 2015-10-23 14:59:47

meter
Contributor
Registered: 2015-07-13
Posts: 78

Help for decode a test with "hf snoop"

As tell here my friend are ported the enio's patch (HF Snoop) to latest version on github, I'm testing for him, he not has PM3.
This is the first snoop between a reader SCL3711 and a real Mifare 1K UID (ff  b6  8a  64) with a nfc-list in loop.
Something is wrong I can't understand very well the data. Someone can help me? The snoop is good for you?

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#2 2015-10-23 15:26:57

meter
Contributor
Registered: 2015-07-13
Posts: 78

Re: Help for decode a test with "hf snoop"

I forgot to write, if someone want test hf snoop can download the patch from here

Thank you

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#3 2015-10-23 17:22:59

Pummarola
Contributor
Registered: 2015-10-19
Posts: 36

Re: Help for decode a test with "hf snoop"

i will compile tonight and report back after installing the patch.

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#4 2015-10-23 19:26:36

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

Re: Help for decode a test with "hf snoop"

the trace you posted looks like a possible valid REQA transmission.  though i'm not yet familiar enough to fully decode it.

so far though it looks pretty good.

quick search found AN90121_10.pdf which has a similar looking REQA example.  (terrible image quality though...)

Last edited by marshmellow (2015-10-23 19:27:36)

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#5 2015-10-24 10:15:24

meter
Contributor
Registered: 2015-07-13
Posts: 78

Re: Help for decode a test with "hf snoop"

for execute the snoop I have used these commands:

hf snoop 10000 1
data samples 40000
data plot

there is a bug, after hf snoop we can't exit without a snoop or watchdog reset PM3

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#6 2015-10-24 15:14:14

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

Re: Help for decode a test with "hf snoop"

It would be helpful to allow similar compression options as holiman made for lf config.  And possibly skip some of the long low periods to squeeze more important samples into the small trace buffer.  But this is a good start.  smile

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#7 2015-10-28 21:28:44

iceman
Administrator
Registered: 2013-04-25
Posts: 9,497
Website

Re: Help for decode a test with "hf snoop"

Yes, the compression options Holiman did would be nice,  and can someone help me understand how to decode a trace?!?!

Reference thread:: http://www.proxmark.org/forum/viewtopic.php?id=1945

Last edited by iceman (2015-10-28 22:41:48)

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#8 2015-10-28 22:32:37

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

Re: Help for decode a test with "hf snoop"

iceman wrote:

Yes, the compression options Holiman did would be nice,  and can someone help me understand how to decode a trace?!?!

Reference thread:: http://www.proxmark.org/forum/viewforum.php?id=1945

bad link?

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#9 2015-10-28 22:42:03

iceman
Administrator
Registered: 2013-04-25
Posts: 9,497
Website

Re: Help for decode a test with "hf snoop"

now its working!

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