I am trying to find the locations on the embedded devices with micros that don't support HSM/SHE. What are the ideas/suggestions for storing the symmetric keys? I found solutions that suggest using public/private keys to encrypt this symmetric key but the micros are not capable of doing this.
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An Arduino is capable of public key encryption. Even a small Attiny85 have enough memory to do so.ThoriumBR– ThoriumBR2024-03-29 18:06:41 +00:00Commented Mar 29, 2024 at 18:06
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Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.Community– Community Bot2024-03-29 22:24:48 +00:00Commented Mar 29, 2024 at 22:24
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@ThoriumBR Performing the encryption and decryption based on the public key is fine but looking to store the secret symmetric key with read/write protection.user3814614– user38146142024-04-01 21:15:27 +00:00Commented Apr 1, 2024 at 21:15
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You could use a Lockable Teensy for that, if your adversary isn't willing to spend several hundred thousand dollars breaking your device.ThoriumBR– ThoriumBR2024-04-01 21:58:23 +00:00Commented Apr 1, 2024 at 21:58
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Thank you @ThoriumBR. What is the possible way for automotive ECUs? This hardware is not possible to integrate into automotive ECUs.user3814614– user38146142024-04-10 15:14:19 +00:00Commented Apr 10, 2024 at 15:14
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