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grahamb's avatar
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grahamb
answered 2020-02-01 14:09:02 +0000

If the device is using a DH key exchange then perfect forward secrecy will prevent decryption even with the private key.

You might be able to perform a MITM either by forcing an algorithm down-grade or by getting the root certificate of the MITM device accepted by the IoT device as a trusted root as is done by many "TSL inspecting" security appliances.