Research, development and trades concerning the powerful Proxmark3 device.
Remember; sharing is caring. Bring something back to the community.
"Learn the tools of the trade the hard way." +Fravia
You are not logged in.
Time changes and with it the technology
Proxmark3 @ discord
Users of this forum, please be aware that information stored on this site is not private.
Below is my capture when sending Request B commands. The Answer To Request messages are shown. Why can't I see the Request commands to the card.
With type A I can see messages in both directions when I do a hi14asnoop and then hi14alist.
The Proxmark reference manual says that when the hi14snoop command is issued the yellow LED turns on, however I don't see it turning on. If I do a hi14asnoop (ie. for type A) I do see the yellow LED turn on.
We have developed our own reader in house, and I tried turning up the Type B modulation index to see if it would help but it didn't. Our modulation index is currently about 12% which is close to the maximum allowable by ISO.
Another question - why all the 44s in the listing below:
> buffclear
#db# Buffer cleared
> hi14snoop
#db# cancelled
> hi14list
recorded activity:
time :rssi: who bytes
---------+----+----+-----------
+ 0: 146: TAG 50 03 ff e1 79 03 18 00 00 00 71 91 f3 e7
+ 132586: 164: TAG 50 03 ff e1 79 03 18 00 00 00 71 91 f3 e7
+ 132586: 212: TAG 50 03 ff e1 79 03 18 00 00 00 71 91 f3 e7
+ 132514: 212: TAG 50 03 ff e1 79 03 18 00 00 00 71 91 f3 e7
+ 132586: 217: TAG 50 03 ff e1 79 03 18 00 00 00 71 91 f3 e7
+ 132892: 186: TAG 50 03 ff e1 79 03 18 00 00 00 71 91 f3 e7
+1142416394: : 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 **FAIL CRC**
+ 0: : 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 **FAIL CRC**
+ 0: : 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 **FAIL CRC**
+ 0: : 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 **FAIL CRC**
+ 0: : 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 **FAIL CRC**
+ 0: : 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 **FAIL CRC**
+ 0: : 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 **FAIL CRC**
Offline
Hi,
Before playing with your in-house reader, are you able to sniff a communication between another reader and a card? If yes, there might be a problem with your in-house reader... If you can't even sniff that communication, I would check with the antenna position, it might not be properly placed.
Also, you see the 44 because the trace buffer is filled with that character when it is initialized. From the SnoopIso14443 function:
// Initialize the trace buffer
memset(trace, 0x44, 1024);Offline
I got the same problem when trying to sniff a 14443 B communication of a commercial reader and a card. I have the TAG response but no reader data at all.
My antenna registers 12V on HF and 9V after I place the card on it. I taped the antenna to the card and approached the reader :
---------Tag---------
---CD case plastic---
-------Antenna-------
--------Reader-------I'll try again tomorrow and if I get the same result I will try to improve the antenna. Any advice is apreciated.
Offline