Proxmark3 community

dontlook

Contributor

Registered: 2017-01-28

Posts: 57

Troubleshoot card that can't be read on new proxmark

I went to grab some of my old hotel keys and test them with a standalone mode.  I noticed  the card doesn't show up when I run HF search either.   I am using the latest version of the RRG repo and the Proxmark 3 RDV4. 

I tested the card on my Android phone and it still works. 

Using the old Proxmark repository and my Proxmark 3 RDV2  I can read the card:
UID : bd 26 e3 85           
ATQA : 00 04         
SAK : 08 [2]         
TYPE : NXP MIFARE CLASSIC 1k | Plus 2k SL1         
proprietary non iso14443-4 card found, RATS not supported         
No chinese magic backdoor command detected         
Prng detection: HARDENED (hardnested)         

Anyone have any suggestions as to how best to narrow this problem down ?   I'll probably have to submit an issue on github, but I'd like to bring as much information as possible.

iceman

Administrator

Registered: 2013-04-25

Posts: 9,538

Website

Re: Troubleshoot card that can't be read on new proxmark

try some distance between tag and antenna?

dontlook

Contributor

Registered: 2017-01-28

Posts: 57

Re: Troubleshoot card that can't be read on new proxmark

I missed the notification on this reply.  No dice. 
I have another card from the same venue (this one is new) and it is giving the same results.

Tried from a couple different heights and still no luck.  Is there a particular revision of the RRG repo that I could check out on the RDV4 which might be good to try?

dontlook

Contributor

Registered: 2017-01-28

Posts: 57

Re: Troubleshoot card that can't be read on new proxmark

With the card on the Proxmark:
[usb] pm3 --> hw tun
         
[=] Measuring antenna characteristics, please wait...
         
[=] You can cancel this operation by pressing the pm3 button         
..
         
[+] LF antenna: 72.23 V - 125.00 kHz         
[+] LF antenna: 33.42 V - 134.83 kHz         
[+] LF optimal: 72.23 V - 125.00 kHz         
[+] LF antenna is OK 
         
[+] HF antenna:  8.22 V - 13.56 MHz         
[+] HF antenna is OK           
         
[+] Displaying LF tuning graph. Divisor 88 is 134.83 kHz, 95 is 125.00 kHz.

Without the card on the Proxmark:
[usb] pm3 --> hw tun
         
[=] Measuring antenna characteristics, please wait...
         
[=] You can cancel this operation by pressing the pm3 button         
..
         
[+] LF antenna: 72.51 V - 125.00 kHz         
[+] LF antenna: 33.42 V - 134.83 kHz         
[+] LF optimal: 72.51 V - 125.00 kHz         
[+] LF antenna is OK 
         
[+] HF antenna:  7.89 V - 13.56 MHz         
[+] HF antenna is OK           
         
[+] Displaying LF tuning graph. Divisor 88 is 134.83 kHz, 95 is 125.00 kHz.

Last edited by dontlook (2020-01-31 05:59:06)

iceman

Administrator

Registered: 2013-04-25

Posts: 9,538

Website

Re: Troubleshoot card that can't be read on new proxmark

Are you using the dual antenna on your RDV4?  Your HF antenna shows a significant low voltage.  Not normal.
Have you removed the antenna?  be sure you have screwed it nicely on again.

dontlook

Contributor

Registered: 2017-01-28

Posts: 57

Re: Troubleshoot card that can't be read on new proxmark

Ahhh yes.  Thank you and sorry about that .  I reseated the antenna and that fixed it.  I should have known to try that.