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Embedded and Microcontrollers
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Embedded and Microcontrollers
Embedded Forum Potting a circuit, how reasonable can this action protect IP?
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  • protecting_ip
  • embedded
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Potting a circuit, how reasonable can this action protect IP?

Catwell
Catwell over 15 years ago
It's a cold, cut throat world out there. Designs are stolen left and right. But, how can one protect a circuit design from IP theft and reverse engineering?
I recently developed a system for a company, and they were concerned that the circuit design could easily be stolen. It was true. Just by looking at the PCB you could easily see the layout, the chips used, and component placement. Unfortunately, patenting was not an option due to several factors.
My solution: Pot the electronics. I figure, might as well make it as hard to reverse engineer as possible.
 
 
Has anyone ever de-potted any electronics, and how did it go? From my experience, it is exceedingly difficult and destroys the circuits. But perhaps I am not learned in the art of corporate espionage.
 
 
Is there another way to make it impossible to see, get at, a circuit?
 
 
Cabe
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  • Former Member
    0 Former Member over 15 years ago

    It is reasonable, however:

     

    1) We just x-ray stuff. Its cheap, easy, and very obvious where all the tracks are.

    2) Depolymerization agent. The potting compound, if not designed to prevent this sort of attack (i.e. just an off the shelf one) will fall apart under this attack.

    3) Heat. Most epoxy resins curl up thier toes after a few jhours of baking. Follow that with a microscope and a set of dental probes....

    4) Microtome. Yup, just cool her down and slice her up.

     

    So that is the bad news.

     

    The good news is you can:

     

    1) Get potting componds with metalic salts (barium, strontium come to mind) that are radio-opaque

    2) Get componds that resist chemical and heat attack (again, they are designed for this)

    3) You can, and it works well as a cheap foil, run a few wires from vias into a birds nest over the board. That defeats all but the most patient x-ray, and

    makes microtoming tedious in the extreme.

    4) Re-etch the componets on the board, or at least grind off all identification.

     

    P.S., a microcontroller is not much of a defense - you have to get to the encrypted ones to be any good against more than a mosest attack.

     

    In reality, is it worth anyone's time to reverse enginbeer your product? Make them good, make them affordable and get brand loyalty. Concentrate on moving forward, and jsut stay one step ahead....

     

    :-)

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  • enrico.migchels
    0 enrico.migchels over 15 years ago in reply to Former Member

    Hi Justin,

     

    You sound as a reverse engineer :-)

     

    Thanks for the enjoying reading material. It is helpful.

     

    Best regards,

     

    Enrico Migchels

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  • enrico.migchels
    0 enrico.migchels over 15 years ago in reply to Former Member

    Hi Justin,

     

    You sound as a reverse engineer :-)

     

    Thanks for the enjoying reading material. It is helpful.

     

    Best regards,

     

    Enrico Migchels

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