From: Tier Nolan <tier.nolan@gmail•com>
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] Long-term mining incentives
Date: Wed, 13 May 2015 14:28:44 +0100 [thread overview]
Message-ID: <CAE-z3OWBVjUog7m9C4P4BHeZe6dy7Dt9f3+kSa6f3v3=oNQJmQ@mail.gmail.com> (raw)
In-Reply-To: <CAE28kUR-0ozFg6D4Es7RCm1pA5xaW-E1R_YSTRRTj3z4XXiWxw@mail.gmail.com>
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On Wed, May 13, 2015 at 1:26 PM, Alex Mizrahi <alex.mizrahi@gmail•com>
wrote:
> He tries to investigate, and after some time discovers that his router (or
> his ISP's router) was hijacked. His Bitcoin node couldn't connect to any of
> the legitimate nodes, and thus got a complete fake chain from the attacker.
> Bitcoins he received were totally fake.
>
> Bitcoin Core did a shitty job and confirmed some fake transactions.
>
I don't really see how you can protect against total isolation of a node
(POS or POW). You would need to find an alternative route for the
information.
Even encrypted connections are pointless without authentication of who you
are communicating with.
Again, it is part of the security model that you can connect to at least
one honest node.
Someone tweated all the bitcoin headers at one point. The problem is that
if everyone uses the same check, then that source can be compromised.
> WIthout checkpoints an attacker could prepare a fork for $10.
> With checkpoints, it would cost him at least $1000, but more likely
upwards of $100000.
> That's quite a difference, no?
Headers first mean that you can't knock a synced node off the main chain
without winning the POW race.
Checkpoints can be replaced with a minimum amount of POW for initial sync.
This prevents spam of low POW blocks. Once a node is on a chain with at
least that much POW, it considers it the main chain.,
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next prev parent reply other threads:[~2015-05-13 13:28 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-11 16:28 Thomas Voegtlin
2015-05-11 16:52 ` insecurity
2015-05-11 17:29 ` Gavin Andresen
2015-05-12 12:35 ` Thomas Voegtlin
[not found] ` <CABsx9T1h7p3hDr7ty43uxsYs-oNRpndzg=dowST2tXtogxRm2g@mail.gmail.com>
[not found] ` <555210AF.3090705@electrum.org>
2015-05-12 16:10 ` Gavin Andresen
2015-05-12 16:21 ` Dave Hudson
2015-05-12 21:24 ` Pedro Worcel
2015-05-12 23:48 ` Adam Back
2015-05-13 15:41 ` Gavin Andresen
2015-05-13 20:05 ` Pedro Worcel
2015-05-13 9:49 ` Thomas Voegtlin
2015-05-13 10:14 ` Tier Nolan
2015-05-13 10:31 ` Alex Mizrahi
2015-05-13 11:29 ` Tier Nolan
2015-05-13 12:26 ` Alex Mizrahi
2015-05-13 13:24 ` Gavin
2015-05-13 13:28 ` Tier Nolan [this message]
2015-05-13 14:26 ` Alex Mizrahi
2015-05-13 23:46 ` Jorge Timón
2015-05-14 0:11 ` Jorge Timón
2015-05-14 0:48 ` Aaron Voisine
2015-05-14 0:58 ` Pieter Wuille
2015-05-14 1:13 ` Aaron Voisine
2015-05-14 1:19 ` Pieter Wuille
2015-05-14 1:31 ` Aaron Voisine
2015-05-14 2:34 ` Aaron Voisine
2015-05-16 20:35 ` Owen Gunden
2015-05-16 22:18 ` Tom Harding
2015-05-17 1:08 ` Aaron Voisine
2015-05-14 0:44 ` Melvin Carvalho
2015-05-25 18:31 ` Mike Hearn
2015-05-26 18:47 ` Thomas Voegtlin
2015-05-27 21:59 ` Mike Hearn
2015-05-27 22:22 ` Gregory Maxwell
2015-05-28 10:30 ` Mike Hearn
2015-05-13 17:49 Damian Gomez
2015-05-18 2:29 Michael Jensen
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