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#1 2017-03-28 21:27:47
- acmusabe
- Contributor
- Registered: 2017-03-28
- Posts: 3
Unidentifiable Doorking Keyfob
Hello all,
I am a security hobbyist and using the Proxmark 3 to duplicate my apartment's keyfob into an ATA5577C chip if that is possible. For this I am first trying to find out the data format and encoding/modulation scheme used in the card. I have tried to do "lf search" command on this keyfob, but the PM3 does not return anything ("no known tags"). Then I used the "data plot" command to see how the trace looks like and I got this following trace.
From this trace, I feel like it uses PSK modulation, but since I am a beginner, I have no idea on how I can approach this trace to extract the correct data format (first [X] bits are facility code, then [Y] bits are unique ID, etc). Has anyone worked with this type of Doorking keyfobs before and knows the correct data format? I have attached a picture of my keyfob (which has both a clicker and a keyfob in the same package) and our apartment's reader (Doorking 1815-330) below in case it might be helpful. Thank you for your help and have a nice day,
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#2 2017-03-30 01:12:21
- marshmellow
- Contributor
- From: US
- Registered: 2013-06-10
- Posts: 2,302
Re: Unidentifiable Doorking Keyfob
lf search u
Searches for unknown tags and would be an option.
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#3 2017-03-30 08:24:26
- iceman
- Administrator
- Registered: 2013-04-25
- Posts: 9,538
- Website
Re: Unidentifiable Doorking Keyfob
...and @OP's links is missing...
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#4 2017-04-01 00:37:45
- marshmellow
- Contributor
- From: US
- Registered: 2013-06-10
- Posts: 2,302
Re: Unidentifiable Doorking Keyfob
his images:
http://imgur.com/a/hmWDW
evidently imgur doesn't allow direct image linking.
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#5 2017-04-01 00:54:37
- marshmellow
- Contributor
- From: US
- Registered: 2013-06-10
- Posts: 2,302
Re: Unidentifiable Doorking Keyfob
it appears to be psk, so lf search u or
lf read
data samples
data rawd p1 ( or p2 )to attempt to demod to binary
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#6 2017-04-01 21:34:47
- lonewolf
- Contributor
- Registered: 2016-09-03
- Posts: 37
Re: Unidentifiable Doorking Keyfob
Doorking 1815-330
Uses 1508 tags, see http://www.proxmark.org/forum/viewtopic.php?id=2950 for more info.
http://www.doorking.com/sites/default/files/downloads/card_readers-Rev-2-15.pdf also relevant ("MicroPlus® and MicroClik® ProxMitters™ (Card + Transmitter) are available")
The linked trace has a terrible DC offset / is a bad read, which is why demod is failing. Try running a "data norm" or "data hpf" first.
Last edited by lonewolf (2017-04-01 21:39:19)
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