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From: Jonas Nick <jonasdnick@gmail.com>
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To: Tom Trevethan <tom@commerceblock.com>,
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Subject: Re: [bitcoin-dev] Blinded 2-party Musig2
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No, proof of knowledge of the r values used to generate each R does not prevent
Wagner's attack. I wrote
> Using Wagner's algorithm, choose R2[0], ..., R2[K-1] such that
> c[0] + ... + c[K-1] = c[K].
You can think of this as actually choosing scalars r2[0], ..., r2[K-1] and
define R2[i] = r2[i]*G. The attacker chooses r2[i]. The attack wouldn't make
sense if he didn't.
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