Proxmark3 community

n0ne

Contributor

Registered: 2015-07-08

Posts: 19

Using client for data analysis without hardware? (solved!)

I was hoping to follow https://code.google.com/p/proxmark3/wiki/TagOps or rather https://github.com/Proxmark/proxmark3/wiki/lf%20tag%20operations and eventually use proxmark3.exe with data acquired with an oscilloscope. However, I find that  the version "pm3-bin-756  (cdc+lua)" from https://code.google.com/p/proxmark3/downloads/list does not accept a "load" command without a serial port specified (and, I assume, the hardware connected..).

Never mind:

https://github.com/Proxmark/proxmark3/wiki/commands seems to say that "load" is actually an argument to "data". Trying this:

P:\pm3-bin-756  (cdc+lua)\pm3-bin-756 - lua branch\win32 (client+GUI)>proxmark3 data load EM4102-1.pm3
ERROR: invalid serial port
proxmark3> data load EM4102-1.pm3
loaded 16000 samples
proxmark3> data plot
proxmark3> Plot Window Keystrokes:

 Key                      Action

 DOWN                     Zoom in
 G                        Toggle grid display
 H                        Show help
 L                        Toggle lock grid relative to samples
 LEFT                     Move left
 <CTL>LEFT                Move left 1 sample
 <SHIFT>LEFT              Page left
 LEFT-MOUSE-CLICK         Set yellow cursor
 Q                        Hide window
 RIGHT                    Move right
 <CTL>RIGHT               Move right 1 sample
 <SHIFT>RIGHT             Page right
 RIGHT-MOUSE-CLICK        Set purple cursor
 UP                       Zoom out

Use client window 'data help' for more plot commands

proxmark3> data autocorr 2000 g
performing 14000 correlations
proxmark3> data askdemod 1
proxmark3> data plot
proxmark3> data load EM4102-1.pm3
loaded 16000 samples
proxmark3> data askdemod 1
proxmark3> data mandemod 64
Warning: Manchester decode error for pulse width detection.
(too many of those messages mean either the stream is not Manchester encoded, or clock is wrong)
Unsynchronized, resync...
(too many of those messages mean the stream is not Manchester encoded)
Manchester decoded bitstream
0 0 1 0 1 1 1 1 0 1 0 1 1 1 1 0
1 1 1 1 1 1 0 0 0 1 1 1 0 0 1 1
1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 1 0 0 0 1 0 1 1 1 1
0 0 1 0 1 1 1 1 0 1 0 1 1 1 1 0
1 1 1 1 1 1 0 0 0 1 1 1 0 0 1 1
1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 1 0 0 0 1 0 1 1 1 1
0 0 1 0 1 1 1 1 0 1 0 1 1 1 1 0
1 1 1 1 1 1 0 0 0 1 1 1 0 0 1 1
1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 1 0 0 0 1 0 1 1 1 1
0 0 1 0 1 1 1 1 0 1 0 1 1 1 1 0
1 1 1 1 1 1 0 0 0 1 1 1 0 0 1 1
1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1
proxmark3>
P:\pm3-bin-756  (cdc+lua)\pm3-bin-756 - lua branch\win32 (client+GUI)>

Note that I disregarded the comment about the "g" parameter so I had to reload the data, as the autocorrelation replaced the data buffer. Also note that the Wiki instructions have notes for newer commands, which I did not test.

The data output stripped of whitespace and aligned matches the wiki data:

                                  001011110101111011111100011100
1111111110000000011000001000101111001011110101111011111100011100
1111111110000000011000001000101111001011110101111011111100011100
1111111110000000011000001000101111001011110101111011111100011100
111111111000000001

(doesn't this mean there should be 3 or 4 correlation peaks?)

Then I found these instructions (less explanation, but specifies how to load data) :
https://github.com/Proxmark/proxmark3/wiki/EM4102%201.pm3%20Walkthrough

Being able to provide incorrect serial port saves me from looking into the source in order to "hack" this argument out of the client. But it brings up another point: https://github.com/Proxmark/proxmark3/wiki/Windows does not actually specify how to build the client on Windows, if I am not mistaken..

The .pm3 file format is just an ANSI text file with a signed decimal integer sample value on each line, ended with Unix newline / line-end (lf aka '\n').
Here are the first lines from EM4102-1.pm3 (16000 samples -> 16001 lines)

85
85
78
68
59
54
56
51
44
35
35
37
33
25
-39
-96
-128
-128
-128
-128
-128
-128
-128
-128
-128
-128
-128
-128
-128
-128
-128
-128
-128
-128
-105
-112
-112
-101
-92
-94
-86
-76
-79
-73
-63
-67
13
127
127
...

To use my oscilloscopes data I will have to reduce the sampling rate to the 125 kHz somehow, ideally in sync ..

BTW: this version of proxmark3.exe' console even supports filename completion using TAB - but it crashes on "quit".. :-)

iceman

Administrator

Registered: 2013-04-25

Posts: 9,536

Website

Re: Using client for data analysis without hardware? (solved!)

how about you download the latest source from GitHub and compile it.   Run that client instead.
If you can't compile yourself, try downloading one of Aspers pre-compiled binary releases in the sticky thread http://www.proxmark.org/forum/viewtopic.php?id=1562

n0ne

Contributor

Registered: 2015-07-08

Posts: 19

Re: Using client for data analysis without hardware? (solved!)

Thanks, I might give it a try once I have converted my oscilloscope capture to a compatible .pm3 trace.