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roconnor avatar roconnor commented on August 24, 2024

My issue was that if HW wallets internals are usually difficult to audit and if they use synthetic nonces then it won't even be possible to spot check that they are not engaging in covert communications to leak secret material.

However synthetic nonces seem reasonable for software wallets. I think I'm okay with keeping the synthetic nonce derivation inside as long as we recommend that hardware wallets use a different, anit-covert-channel method and refer them to an appropriate document.

I'm even willing to try to write up a document for anti-covert-channel HW signature. I'm just worried that because I don't personally make hardware wallets, no one will use it because I somehow misunderstand some aspect of their design constraints.

from bips.

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