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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
    Mar 29 at 18:06
  • 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 Bot
    Mar 29 at 22:24
  • @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. Apr 1 at 21:15
  • You could use a Lockable Teensy for that, if your adversary isn't willing to spend several hundred thousand dollars breaking your device.
    – ThoriumBR
    Apr 1 at 21:58
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    thank you @ThoriumBR yesterday

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