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Protect pyboard from reading the code
Posted: Sun Sep 11, 2016 10:27 pm
by kamikaze
Is it possible to protect python code from being read via USB or any other way?
Re: Protect pyboard from reading the code
Posted: Sun Sep 11, 2016 10:40 pm
by markxr
If you ship the python modules already compiled, then people won' t be able to access the source.
A Micropython decompiler is probably feasible.
In general, you should not waste time trying to prevent reverse engineering, although it depends what the exact application is (and hence motivation).
Re: Protect pyboard from reading the code
Posted: Mon Sep 12, 2016 4:07 am
by dhylands
In order to do this you should read up on "read protection" in the datasheet.
If the device is not read-protected, then its trivial to read the entire contents of flash using DFU. With read-protection enabled, you can't.
Disabling read-protection does a complete erase of flash.
Re: Protect pyboard from reading the code
Posted: Mon Sep 12, 2016 3:19 pm
by kamikaze
dhylands wrote:In order to do this you should read up on "read protection" in the datasheet.
If the device is not read-protected, then its trivial to read the entire contents of flash using DFU. With read-protection enabled, you can't.
Disabling read-protection does a complete erase of flash.
Thanks, that's what I'm looking for )
Re: Protect pyboard from reading the code
Posted: Mon Oct 10, 2016 5:23 pm
by kamikaze
in case of someone is interested in such protection:
https://github.com/xyb/upy-stm-flash/blob/master/rdp.py
The only question I have - if I will set Level 2 - will micropython and my code work on such system?
Re: Protect pyboard from reading the code
Posted: Mon Oct 10, 2016 6:38 pm
by dhylands
If you choose to use level 2 then DFU and JTAG are both disabled, which means that your code will need to provide a mechanism to reflash should you ever wish to change the onboard firmware for any reason.