[curves] Zero knowledge proof on ECDSA signatures.
Jan Moritz Lindemann
panda at panda.cat
Wed Feb 17 15:21:46 PST 2016
FYI I've found that this is a "Non-transferable proof of signature
knowledge" and not a "Zero knowledge proof".
2016-02-17 17:27 GMT-05:00 Watson Ladd <watsonbladd at gmail.com>:
> On Wed, Feb 17, 2016 at 12:03 PM, Jan Moritz Lindemann <panda at panda.cat>
> > Thanks! A proof of security is exactly what I am looking for, how could I
> > elaborate one?
> You can't easily: you have to show that given m, r, and sR no one can
> compute a valid ECDSA signature on m unless they compute the original
> private key. If you somehow show that, you can then try to show your
> construction is a zero-knowledge protocol once sR is revealed, but
> this is hard because it isn't the Fiat-Shamir transform of a sigma
> protocol. It's easy enough to fix that up by making m' the hash of the
> commitments. Then you can go try to prove this is an honest-verifier
> zero-knowledge sound protocol, and thus secure in the ROM.
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> "Man is born free, but everywhere he is in chains".
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