Is it possible to calculate a public key from the message hash and signature?

It is possible to create a public key from the signature. It will be equivalent to the key used to generate the signature but not necessarily identical.

You can find an example implementation here.

David Schwartz

Posted 2017-09-21T20:01:19.600

Reputation: 46 931

I think you not right – D L – 2017-09-21T22:59:48.600

I guess that's possible. Do you have some reason to think that I'm not right? Or maybe this link will convince you. Or perhaps section 4.1.6 of this link.

– David Schwartz – 2017-09-21T23:14:14.183

proove it please – D L – 2017-09-22T00:32:47.147

1Read David's links. – Pieter Wuille – 2017-09-22T00:36:42.190

so the answer is ... yes or not? – D L – 2017-09-22T00:39:57.927

1Read David's answer. – Pieter Wuille – 2017-09-22T01:37:36.657

Is it possible to calculate a public key from the message hash and signature?

Answers