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Implement anti-klepto protocol to protect against covert nonces #47

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paulmillr opened this issue May 18, 2023 · 1 comment

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paulmillr commented May 18, 2023 •

edited

Not sure if the low-level library is the best place for such API, but at least some primitives need to be implemented for the anti-klepto protocol.

hot->cold: sha(k_hot)
cold->hot: kP_cold = hash(tx, privkey, sha(k_hot)) * G
hot->cold: k_hot
cold->hot: signed_tx
hot:       verify tx.R == kP_cold + k_hot*G

https://shiftcrypto.ch/blog/anti-klepto-explained-protection-against-leaking-private-keys/, bitcoin-core/secp256k1#637

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paulmillr added the enhancement label

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paulmillr commented May 20, 2023

Disadvantage: user may erroneously sign 2 txs, producing different non-deterministic nonces, and push those txs, which will leak their private key.

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