@Eyzi, take a look at conversation about Security: not much to do... and worse, if there is easy way to access by wire connection...
There are two things:
Unfortunately, latter is more difficult than the first one.
Take a look at Microchip - Security ICs.
Espruino firmware would need a change to route all console input - input that does system control - through such a protective filter.
As Microchip has MCs w/ embedded security (SW or HW or both), so does ST have embedded security (SW). Licensing may be an issue, but I'm sure Espruino could be modified in order to enable / include it... Experience though says that code and execution memory are a factor and both are already tight... Porting a security considerate version of Espruino on a STM32 chip with built-in HW security features could be the next step...
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