From: Andrew Poelstra <apoelstra@wpsoftware•net>
To: Gregory Maxwell via bitcoin-dev <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] Taproot: Privacy preserving switchable scripting
Date: Wed, 24 Jan 2018 01:52:57 +0000 [thread overview]
Message-ID: <20180124015256.GR9082@boulet.lan> (raw)
In-Reply-To: <CAAS2fgTNcCB2mfvCBhC_AhgxX=g8feYguGHN_VPWW0EoOOxMyA@mail.gmail.com>
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On Tue, Jan 23, 2018 at 10:45:06PM +0000, Gregory Maxwell via bitcoin-dev wrote:
> On Tue, Jan 23, 2018 at 10:22 PM, Anthony Towns <aj@erisian•com.au> wrote:
> > Hmm, at least people can choose not to reuse addresses currently --
> > if everyone were using taproot and that didn't involve hashing the key,
>
> Can you show me a model of quantum computation that is conjectured to
> be able to solve the discrete log problem but which would take longer
> than fractions of a second to do so? Quantum computation has to occur
> within the coherence lifetime of the system.
>
> > way for individuals to hedge against quantum attacks in case they're ever feasible, at least that I can see (well, without moving their funds out of bitcoin anyway)?
>
> By using scriptpubkeys with actual security against quantum computers
> instead of snake-oil.
>
> > (It seems like using the point at infinity wouldn't work because
>
> Indeed, that doesn't work.
>
> > that when quantum attacks start approaching feasibility. If funds are
> > being held in reused addresses over the long term, that would be more
>
> They are. But I don't believe that is relevant; the attacker would
> simply steal the coins on spend.
Then the system would need to be hardforked to allow spending through a
quantum-resistant ZKP of knowledge of the hashed public key. I expect
that in a post-quantum world there will be demand for such a fork,
especially if we came into such a world through surprise evidence of
a discrete log break.
--
Andrew Poelstra
Mathematics Department, Blockstream
Email: apoelstra at wpsoftware.net
Web: https://www.wpsoftware.net/andrew
"A goose alone, I suppose, can know the loneliness of geese
who can never find their peace,
whether north or south or west or east"
--Joanna Newsom
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next prev parent reply other threads:[~2018-01-24 1:52 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-23 0:30 Gregory Maxwell
2018-01-23 1:55 ` Chris Belcher
2018-01-23 2:51 ` Matt Corallo
2018-01-23 14:39 ` Mark Friedenbach
2018-01-23 21:23 ` Matt Corallo
2018-01-23 21:38 ` Gregory Maxwell
2018-01-23 6:44 ` Anthony Towns
2018-01-23 13:15 ` Gregory Maxwell
2018-01-23 22:22 ` Anthony Towns
2018-01-23 22:45 ` Gregory Maxwell
2018-01-24 1:52 ` Andrew Poelstra [this message]
2018-01-24 9:28 ` Tim Ruffing
2018-01-24 12:51 ` Natanael
2018-01-24 15:38 ` Tim Ruffing
2018-01-24 18:51 ` Natanael
2018-01-24 23:22 ` Tim Ruffing
2018-01-25 0:09 ` Natanael
2018-01-26 13:14 ` [bitcoin-dev] Recovery of old UTXOs in a post-quantum world Tim Ruffing
2018-01-27 17:07 ` [bitcoin-dev] Taproot: Privacy preserving switchable scripting Russell O'Connor
2018-01-27 17:23 ` Matt Corallo
2018-01-23 15:43 ` Greg Sanders
2018-01-26 21:34 ` Gregory Maxwell
2018-07-13 1:51 ` [bitcoin-dev] Generalised taproot Anthony Towns
2018-10-24 2:22 ` Pieter Wuille
2018-02-05 9:27 ` [bitcoin-dev] Taproot: Privacy preserving switchable scripting ZmnSCPxj
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