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MilkThief

Contributor

Registered: 2014-04-11

Posts: 104

help request in identificating my HF card

Hi all,
I own a (working) tag used as rechargeable debit card in a laundry service.
Its format is the ID-01 of the ISO/IEC 7810 standard (like a credit card).
I'd like to identify what kind of RFID standard it implements but I can't figure out.
First of all I used the "hw tune" and seen a voltage drop on the HF frequencies.
Then I tried the "hf 14a reader" but "can't select card" came out.
Then I tried every "hf" standard with the combination of "reader" and no results.
(with my PM3 I can interact with different HF tags with no problems)
I watched at it trough a powerful light and saw the tipical HF antenna, so I suppose it is really an HF tag.
I'd like to ask to you what can I do in order to understand something more about that tag.
Thank you all! 

MilkThief

Contributor

Registered: 2014-04-11

Posts: 104

Re: help request in identificating my HF card

Nobody has an idea?

marshmellow

Contributor

From: US

Registered: 2013-06-10

Posts: 2,302

Re: help request in identificating my HF card

not enough information. 
how much does the voltage drop? 

the only references to ID01 on the web point to a standard LF EM41xx chip.

HF antenna and LF antenna can be very similar, especially in Credit Card sized tags, as can be the chip carriers. (UHF is very different...)

Picture?  HW Tune output?  reader model?

Last edited by marshmellow (2014-11-12 18:39:35)

MilkThief

Contributor

Registered: 2014-04-11

Posts: 104

Re: help request in identificating my HF card

Hi Marshmellow, thank you very much for your reply!

Here you have my "hw version"

proxmark3> hw version
#db# Prox/RFID mark3 RFID instrument                 
#db# bootrom: /-suspect 2014-10-14 14:41:16                 
#db# os: /-suspect 2014-10-14 14:41:18                 
#db# HF FPGA image built on 2014/ 6/19 at 21:26: 2                 
uC: AT91SAM7S256 Rev B          
Embedded Processor: ARM7TDMI          
Nonvolatile Program Memory Size: 256K bytes          
Second Nonvolatile Program Memory Size: None          
Internal SRAM Size: 64K bytes          
Architecture Identifier: AT91SAM7Sxx Series          
Nonvolatile Program Memory Type: Embedded Flash Memory          
proxmark3> 

Here you have my "hw tune" WITHOUT tags on my dual band antenna

proxmark3> hw tune
#db# Measuring antenna characteristics, please wait...                 
#db# Measuring complete, sending report back to host                 
          
# LF antenna: 14,50 V @   125.00 kHz          
# LF antenna: 14,77 V @   134.00 kHz          
# LF optimal: 19,07 V @   129,03 kHz        
# HF antenna: 10,57 V @    13.56 MHz          
proxmark3> 

Here you have my "hw tune" WITH the tag placed on top

proxmark3> hw tune
#db# Measuring antenna characteristics, please wait...                 
#db# Measuring complete, sending report back to host

# LF antenna: 14,50 V @   125.00 kHz          
# LF antenna: 14,90 V @   134.00 kHz          
# LF optimal: 19,07 V @   129,03 kHz          
# HF antenna:  2,77 V @    13.56 MHz
# Your HF antenna is unusable.
proxmark3> 

The voltage drop is similar to the one of a mifare or similar HF tag. On my single band PCB antenna I obtain the same results. The picture I could attach would be the same of a ISO/IED 7810 format 1 tag (credit card size).
I prefer to not post the tag with the specific logo of the laundry, but I could send it to you in pvt.
Let me know if I can provide to you more informations (I don't know what).
This is really a mistery for me...
Thank you!

MilkThief

Contributor

Registered: 2014-04-11

Posts: 104

Re: help request in identificating my HF card

With ID-01, I mean this.

It is definitely not an UHF antenna: its antenna is a inductor made for act in an inductive coupling, very different to the UHF antenna which has a dipole for electromagnetic coupling...

Its antenna is made with a winding squared that runs along the perimeter, usually used for HF. I always saw a winding round for LF ...

MilkThief

Contributor

Registered: 2014-04-11

Posts: 104

Re: help request in identificating my HF card

The continuation of this story is here...

Last edited by MilkThief (2014-11-21 22:56:52)