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  • This may be possible to bypass by using radiation which can cause certain types of RAM to freeze, and this would not trigger any chemical explosives but would completely disable any electronics. Commented Mar 12, 2018 at 12:27
  • that is dependent on how you design this logic. if you make it so that the circuit wans to destroy it self all the time except due to the "safety" mechanism that prevents it. Than you would need a very focused ionization beam to target the logic that does this and destroy it in a specific way. If the IC is using 3d-Logographics to make this logic and the "safety" logic is behind the "trip" logic the IC would probably still be destroyed first. This is by no means a guarantee but guarantees do not exist in this field, only probability. Commented Mar 13, 2018 at 15:10
  • IT is also possible to make a trigger that is sensitive to ionizing radiation. (e.a. to much radiation will also trigger the fail-safe) . Commented Mar 13, 2018 at 15:11
  • Well that's the thing. A burst of X-rays can freeze CMOS memory in place. You can't trust any logic when the entire system can zapped at the same time. You'd probably need to use radiation-hardened "rugged" processors. They tend to be pretty expensive though. Commented Mar 14, 2018 at 3:12
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    temper proof is only true in specific use cases and against specific threats. it is not universally temper proof. It is possible to make a piece of hardware that is tamper proof in the practical sense. (e.a. you need a specific set of conditions for it not to have its mechanism trigger when it should). the cost increase with each step you take. but if funds are not a factor you could design such a piece of hardware. This also hinges on your definition of temporing, e.a. your ionizing radiation blast could be considered destroying and not temporing. Commented Mar 15, 2018 at 9:36