Yes you can; see post #3Which uC do you want to use?
The uC use fuse to protecting the code, when you download the code into the uC and burn the fuse then from outside can't read the code.
What I said is the general method can't do it, and I knew if you willing to pay then such thing is easy.Yes you can; see post #3
He decided to leave the original page alone, but there is a link to more processors that he has investigated.What I said is the general method can't do it, and I knew if you willing to pay then such thing is easy.
The linking page is old, so I can't find any related with arduino.
I will look more carefully about what you linked, thanks.
In fairness I should point out that this protection only protects you from a hobbyist with a device programmer. It does not protect you from a determined villain with unlimited time and resources who will slice open the package, exposing the die to examination with high tech tools. He might have to ruin a handful of devices, but the code will be extracted. Have a look at Sergei's web page.
https://www.cl.cam.ac.uk/~sps32/mcu_lock.html
EDIT: Sorry I forgot the link
I think that EEPROM and Flash are basically the same technology. If they can dissolve the plastic package, they can probe the die. A Ceramic package is much harder to disassemble. They are made to be hardened agains physical attack, and some of them will eat carbide tools.Is that possible with chips that use EEPROM?
I find this one interesting.
Eavesdropping techniques monitor, with high time resolution, the analog characteristics of all supply and interface connections and any other electromagnetic radiation by the processor during normal operation
I remember back in the day of the old monochrome monitor someone demonstrating a device that could eavesdrop on a monitor remotely.
But isn't an EEPROM basically just an electrical charge on a floating-gate? That can be sen with a microscope?I think that EEPROM and Flash are basically the same technology. If they can dissolve the plastic package, they can probe the die. A Ceramic package is much harder to disassemble. They are made to be hardened agains physical attack, and some of them will eat carbide tools.
Who said microscope? @spinnaker, what do you mean by probe? I assumed probing bypassed the chips control circuitry and addressed the memory cells directly.But isn't an EEPROM basically just an electrical charge on a floating-gate? That can be sen with a microscope?
Who said microscope? @spinnaker, what do you mean by probe? I assumed probing bypassed the chips control circuitry and addressed the memory cells directly.
If I remember right, the French used that to spy on US embassy or some conference.I remember back in the day of the old monochrome monitor someone demonstrating a device that could eavesdrop on a monitor remotely.
by Jake Hertz
by Jake Hertz
by Jake Hertz