Hello, i have built a prototype and have written an application firmware.
Device will send data logs on server database.
How can i protect the authentication of the data logs (produced by original firmware and not modified)
Adding some code in bootloader , looking for verification value in firmware in order to update (so I can only update) ?
Adding verification value between device and server (on run-time verificatoin)?
Use end-to-end encryption and make it completely impossible for an unauthorized person to access the sending device.
device will be given to people, i just would like to know if its possible to make someone's life hard to hack/cheat
There is always a tradeoff between the expense of making something hard to crack, and the value of the information that can be gained by doing so. Consider consulting a security professional.
hm well you can always remove sensor (mpu9250)which produce the data for logging hack it( to produce different data) and you dont need to hack the encrypted firmware 