From: Adam Back <adam@cypherspace.org>
To: Joel Kaartinen <joel.kaartinen@gmail.com>
Cc: bitcoin-development@lists.sourceforge.net
Subject: Re: [Bitcoin-development] Is this a safe thing to be doing with ECC addition? (Oracle protocol)
Date: Sat, 8 Mar 2014 09:41:01 -0800 [thread overview]
Message-ID: <20140308174101.GA21902@netbook.cypherspace.org> (raw)
In-Reply-To: <531AF2EA.50904@gmail.com>
Also the other limitation for ECDSA is that there is no known protocol to
create a signture with a+b (where keys P=aG, Q=bG, R=P+Q=(a+b)G). without
either a sending its private key to b or viceversa (or both to a third
party).
With Schnorr sigs you can do it, but the k^-1 term in ECDSA makes a (secure)
direct multiparty signature quite difficult.
ps probably only 1 party needs to hash their key
P=aG
H(P) ->
<- Q=bG
P ->
Adam
On Sat, Mar 08, 2014 at 12:37:30PM +0200, Joel Kaartinen wrote:
> If both parties insist on seeing a hash of the other party's public key
> before they'll show their own public key, they can be sure that the
> public key is not chosen based on the public key they themselves
> presented.
next prev parent reply other threads:[~2014-03-08 17:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-08 6:55 [Bitcoin-development] Is this a safe thing to be doing with ECC addition? (Oracle protocol) Edmund Edgar
2014-03-08 8:10 ` Alan Reiner
2014-03-08 8:51 ` Edmund Edgar
2014-03-08 10:37 ` Joel Kaartinen
2014-03-08 17:41 ` Adam Back [this message]
2014-03-08 18:15 ` Natanael
2014-03-08 23:13 ` Alan Reiner
2014-03-08 20:30 ` Alan Reiner
-- strict thread matches above, loose matches on Subject: below --
2014-03-04 2:59 Edmund Edgar
2014-03-04 5:07 ` Odinn Cyberguerrilla
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