From: Natanael <natanael.l@gmail•com>
To: Adam Back <adam@cypherspace•org>
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 19:15:47 +0100 [thread overview]
Message-ID: <CAAt2M18Jcfo8nFBM+PppkWhmWhF4bd3fpRL2--=jZw4We1-kPw@mail.gmail.com> (raw)
In-Reply-To: <20140308174101.GA21902@netbook.cypherspace.org>
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You can always use a secure multiparty computation algorithm to do it.
https://en.wikipedia.org/wiki/Secure_multi-party_computation
But those aren't the fastest algorithms in the world, and usually both
participants needs to be online at the same time. I guess most people would
prefer a two-step algorithm that can be performed asynchronously.
- Sent from my phone
Den 8 mar 2014 18:44 skrev "Adam Back" <adam@cypherspace•org>:
> 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.
>
>
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next prev parent reply other threads:[~2014-03-08 18:15 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-08 6:55 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
2014-03-08 18:15 ` Natanael [this message]
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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