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It all comes down to your threat model, right? Just because an implementation is done in hardware does not mean that power and fault attacks must be considered. If I host the hardware in my secure facility with armed guards at the door, but the hardware is connected to a machine which is connected to the internet, I might feel that it is okay to not be ...


I'll answer the related questions in order: No, because a ciphertext (generated from a key stream generated by a stream cipher) should be indistinguishable from random data, and a MAC should be as well. No, because #1 depends on the secret, and the secret was derived using a Diffie-Hellman key agreement algorithm, using the given curve. To know ...

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