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#1 2019-05-22 17:11:17

tristanik
Contributor
Registered: 2014-11-25
Posts: 96

Pcf7931 bruteforce

Hello my friends
I am in possession of a password-protected pcf. I know the first 5 bytes (FBA9EF4DC4) and I would like to try a bruteforce. I wrote the command:
- lf pcf7931 bruteforce FBA9EF4DC40000 2
but Proxmark easy responds
-proxmark3> lf pcf7931 bruteforce FBA9EF4DC40000 2
-Bruteforcing from password: fb 00 a9 00 ef 00 4d         
-Trying each password 2 times
something I don't understand, the last 4 bytes should change, but not the first..

this is my configuration with official 32

Output will be flushed after every print.
Prox/RFID mark3 RFID instrument         
bootrom: master/v3.1.0-88-g9ebbfd8-suspect 2019-04-23 09:35:14
os: master/v3.1.0-88-g9ebbfd8-suspect 2019-04-23 09:35:16
fpga_lf.bit built for 2s30vq100 on 2015/03/06 at 07:38:04
fpga_hf.bit built for 2s30vq100 on 2019/03/20 at 08:08:07
SmartCard Slot: not available
         
uC: AT91SAM7S256 Rev C         
Embedded Processor: ARM7TDMI         
Nonvolatile Program Memory Size: 256K bytes. Used: 206188 bytes (79%). Free: 55956 bytes (21%).         
Second Nonvolatile Program Memory Size: None         
Internal SRAM Size: 64K bytes         
Architecture Identifier: AT91SAM7Sxx Series         
Nonvolatile Program Memory Type: Embedded Flash Memory

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#2 2019-05-22 18:01:23

piwi
Contributor
Registered: 2013-06-04
Posts: 704

Re: Pcf7931 bruteforce

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#3 2019-05-30 14:29:15

piwi
Contributor
Registered: 2013-06-04
Posts: 704

Re: Pcf7931 bruteforce

Did you succeed? Fix is now available in master branch.

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