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From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] PSA: Taproot loss of quantum protections
Date: Tue, 16 Mar 2021 08:01:47 +0900	[thread overview]
Message-ID: <CALJw2w4hBk1pZrV7E6FNDPDCWH=T_S6qAHGKvRC6JsT9iZevfg@mail.gmail.com> (raw)
In-Reply-To: <a4b9df55-b95b-9c95-62ea-7bf6eeec113d@mattcorallo.com>

On Tue, 16 Mar 2021 at 07:48, Matt Corallo via bitcoin-dev
<bitcoin-dev@lists.linuxfoundation.org> wrote:
>
> Overall, the tradeoffs here seem ludicrous, given that any QC issues in Bitcoin need to be solved in another way, and
> can't practically be solved by just relying on the existing hash indirection.

The important distinction here is that, with hashes, an attacker has
to race against the spending transaction confirming, whereas with
naked pubkeys, the attacker doesn't have to wait for a spend to occur,
drastically increasing the available time to attack.

It may initially take months to break a single key. In such a
scenario, anyone with a hashed pubkey would be completely safe* (even
at spend time), until that speeds up significantly, while Super Secure
Exchange X with an ultra-cold 38-of-38 multisig setup using Taproot
would have a timer ticking, since the attacker need only find a single
privkey like with any old P2PK output.

(* assuming no address reuse)


  reply	other threads:[~2021-03-15 23:11 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-15 21:48 [bitcoin-dev] PSA: Taproot loss of quantum protections Luke Dashjr
2021-03-15 22:05 ` Matt Corallo
2021-03-15 22:30   ` Robert Spigler
2021-03-15 22:40   ` Jeremy
2021-03-15 22:48     ` Matt Corallo
2021-03-15 23:01       ` Karl-Johan Alm [this message]
2021-03-15 23:19         ` Matt Corallo
2021-03-15 23:46         ` Lloyd Fournier
2021-03-16  0:50         ` Anthony Towns
2021-03-16  2:38           ` ZmnSCPxj
2021-03-16  3:44   ` Luke Dashjr
2021-03-16 13:28     ` Andrew Poelstra
2021-03-16 17:25     ` Matt Corallo
2021-03-17  1:23       ` Ryan Grant
2021-03-17 11:56         ` Eoin McQuinn
2021-03-15 23:12 ` Andrew Poelstra
2021-03-16 14:10   ` Andrea
2021-03-16 15:15     ` [bitcoin-dev] Provisions (was: PSA: Taproot loss of quantum protections) Andrew Poelstra
2021-03-17  4:24       ` ZmnSCPxj
2021-03-17  8:29         ` Andrea
2021-03-20 16:31           ` Andrea Barontini
2021-03-16  0:24 ` [bitcoin-dev] PSA: Taproot loss of quantum protections David A. Harding
2021-04-05  0:27   ` Lloyd Fournier
2021-04-16  3:47     ` ZmnSCPxj
2021-04-16  5:00       ` Lloyd Fournier
2021-03-22 14:24 ` Erik Aronesty
2021-03-23  9:36   ` Martin Schwarz
2021-03-23 10:50   ` Tim Ruffing
2021-08-12 22:08   ` Erik Aronesty

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