From: Jeff Garzik <jgarzik@bitpay•com>
To: Chris Beams <chris@beams•io>
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] Presenting a BIP for Shamir's Secret Sharing of Bitcoin private keys
Date: Sat, 29 Mar 2014 09:27:36 -0400 [thread overview]
Message-ID: <CAJHLa0N0YCHfBeDq+QLqK3ZVWD-rAx85MXvX4OBqSoQqgCXm2w@mail.gmail.com> (raw)
In-Reply-To: <CA0DE0F6-C5B9-4BC4-9F79-D98C89A159F4@beams.io>
The comparison with multisig fails to mention that multi-signature
transactions explicitly define security at the transaction level.
This permits fine-grained specificity of what a key holder may
approve.
Shamir is much more coarse-grained. You reconstitute a private key,
which may then be used to control anything that key controls. Thus,
in addition to Shamir itself, you need policies such as "no key
reuse."
My first impression of Shamir many moons ago was "cool!" but that's
since been tempered by thinking through the use cases. Shamir has a
higher D.I.Y. factor, with a correspondingly larger surface of
things-that-could-go-wrong, IMO.
(None of this implies making an informational BIP lacks value; I'm all
for an informational BIP)
On Sat, Mar 29, 2014 at 7:54 AM, Chris Beams <chris@beams•io> wrote:
> Enlightening; thanks, Matt. And apologies to the list for my earlier inadvertent double-post.
>
> On Mar 29, 2014, at 12:16 PM, Matt Whitlock <bip@mattwhitlock•name> wrote:
>
>> On Saturday, 29 March 2014, at 10:08 am, Chris Beams wrote:
>>> Matt, could you expand on use cases for which you see Shamir's Secret Sharing Scheme as the best tool for the job? In particular, when do you see that it would be superior to simply going with multisig in the first place? Perhaps you see these as complimentary approaches, toward defense-in-depth? In any case, the Motivation and Rationale sections of the BIP in its current form are silent on these questions.
>>
>> I have added two new sections to address your questions.
>>
>> https://github.com/whitslack/btctool/blob/bip/bip-xxxx.mediawiki
>
>
> ------------------------------------------------------------------------------
>
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>
--
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc. https://bitpay.com/
next prev parent reply other threads:[~2014-03-29 13:28 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-29 8:05 Matt Whitlock
2014-03-29 8:34 ` Tamas Blummer
2014-03-29 8:44 ` Tamas Blummer
2014-03-29 8:51 ` Matt Whitlock
2014-03-29 8:54 ` Matt Whitlock
2014-03-29 16:54 ` Matt Whitlock
2014-03-29 17:37 ` Tamas Blummer
2014-03-29 9:08 ` Chris Beams
2014-03-29 9:31 ` Matt Whitlock
2014-03-29 11:16 ` Matt Whitlock
2014-03-29 11:54 ` Chris Beams
2014-03-29 13:27 ` Jeff Garzik [this message]
2014-03-29 13:36 ` Mike Hearn
2014-03-29 13:38 ` Tamas Blummer
2014-03-29 14:10 ` Matt Whitlock
2014-03-29 14:19 ` Jeff Garzik
2014-03-29 14:55 ` Matt Whitlock
2014-03-29 15:04 ` Mike Hearn
2014-03-29 14:28 ` Watson Ladd
2014-03-29 14:36 ` Gregory Maxwell
2014-03-29 15:01 ` Matt Whitlock
2014-03-29 9:21 ` Chris Beams
[not found] <CACsn0ckScTWG4YxNCscxvtdsmcUkxtR2Gi-rdBs2HCkirPz5rA@mail.gmail.com>
2014-03-29 15:44 ` Matt Whitlock
2014-03-29 16:59 ` Alan Reiner
2014-03-29 17:19 ` Matt Whitlock
2014-03-29 17:52 ` Alan Reiner
2014-03-29 18:00 ` Matt Whitlock
2014-03-29 18:08 ` Alan Reiner
2014-03-29 18:10 ` Matt Whitlock
[not found] ` <CAAt2M18j7bGDsKouVw+e4j+FMiJ4vK6-sx+nrkwHyiKLqiH7Jg@mail.gmail.com>
2014-03-29 19:34 ` Natanael
2014-04-04 2:38 ` Jeff Garzik
2014-03-29 18:16 ` Tamas Blummer
2014-03-29 18:41 ` Alan Reiner
2014-03-29 17:28 ` Roy Badami
2014-03-29 17:42 ` Matt Whitlock
2014-03-29 17:51 ` Roy Badami
2014-03-29 17:28 ` devrandom
[not found] ` <1396113933.8809.91.camel@mimiz>
2014-03-29 17:38 ` Matt Whitlock
2014-03-29 17:46 ` Gregory Maxwell
2014-03-29 19:49 ` Tamas Blummer
2014-03-29 17:48 ` devrandom
2014-03-29 17:51 ` Matt Whitlock
2014-03-29 17:56 ` devrandom
2014-04-03 12:41 Nikita Schmidt
2014-04-03 21:42 ` Matt Whitlock
2014-04-04 13:51 ` Nikita Schmidt
2014-04-04 14:14 ` Gregory Maxwell
2014-04-04 16:05 ` Matt Whitlock
2014-04-04 16:25 ` Gregory Maxwell
2014-04-04 16:36 ` Matt Whitlock
2014-04-04 17:08 ` Gregory Maxwell
2014-04-04 17:16 ` Matt Whitlock
2014-04-04 17:51 ` Gregory Maxwell
2014-04-04 18:53 ` Matt Whitlock
2014-04-04 16:03 ` Matt Whitlock
2014-04-08 0:33 ` Nikita Schmidt
2014-04-08 0:38 ` Gregory Maxwell
2014-04-08 1:46 ` Matt Whitlock
2014-04-08 2:07 ` Gregory Maxwell
2014-04-08 11:52 ` Matt Whitlock
2014-04-10 22:31 ` Nikita Schmidt
2014-04-22 8:06 ` Jan Møller
2014-04-22 8:11 ` Matt Whitlock
2014-04-22 8:27 ` Jan Møller
2014-04-22 8:29 ` Matt Whitlock
2014-04-22 8:39 ` Jan Møller
2014-04-22 8:43 ` Matt Whitlock
2014-04-22 8:51 ` Jan Møller
2014-04-22 9:13 ` Matt Whitlock
2014-04-22 11:50 ` Justin A
2014-04-22 8:35 ` Matt Whitlock
2014-04-22 8:39 ` Tamas Blummer
2014-04-22 8:40 ` Matt Whitlock
2014-04-22 8:43 ` Tamas Blummer
2014-04-22 8:47 ` Matt Whitlock
2014-04-22 8:50 ` Tamas Blummer
2014-04-22 15:32 ` Mark Friedenbach
2014-04-22 15:49 ` Tamas Blummer
2014-04-22 17:03 ` Mark Friedenbach
2014-04-22 17:07 ` Jan Møller
2014-04-22 18:29 ` Tamas Blummer
2014-04-22 18:46 ` Gregory Maxwell
2014-04-23 5:33 ` Tamas Blummer
2014-04-23 6:16 ` Gregory Maxwell
2014-05-05 19:36 ` Nikita Schmidt
2014-05-12 12:09 ` Jan Møller
2014-08-14 19:23 ` Nikita Schmidt
2014-04-22 13:37 ` Nikita Schmidt
2014-04-22 8:15 ` Gregory Maxwell
2014-04-22 8:49 ` Jan Møller
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