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From: Cameron Garnham <da2ce7@gmail.com>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP 151
Date: Wed, 29 Jun 2016 00:40:23 +0300	[thread overview]
Message-ID: <B1AF0E38-522E-4EC7-8595-92972D658430@gmail.com> (raw)
In-Reply-To: <CAAS2fgRGbnH-NtPRdLe0yhFSoqJ7b6O25LfyGv_ULHhy8bBSpg@mail.gmail.com>

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Unauthenticated link level encryption is wonderful! MITM attacks are overrated; as they require an active attacker.

Stopping passive attacks is the low hanging fruit. This should be taken first.

Automated and secure peer authentication in a mesh network is a huge topic. One of the unsolved problems in computer science.

A simple 'who is that' by asking for the fingerprint of your peers from your other peers is a very simple way to get 'some' authentication.  Semi-trusted index nodes also is a low hanging fruit for authentication.

However, let's first get unauthenticated encryption. Force the attackers to use active attacks. (That are thousands times more costly to couduct).

Sent from my iPhone

> On 29 Jun 2016, at 00:36, Gregory Maxwell via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
> 
> On Tue, Jun 28, 2016 at 9:22 PM, Eric Voskuil via bitcoin-dev
> <bitcoin-dev@lists.linuxfoundation.org> wrote:
>> An "out of band key check" is not part of BIP151.
> 
> It has a session ID for this purpose.
> 
>> It requires a secure channel and is authentication. So BIP151 doesn't provide the tools to detect an attack, that requires authentication. A general requirement for authentication is the issue I have raised.
> 
> One might wonder how you ever use a Bitcoin address, or even why we
> might guess these emails from "you" aren't actually coming from the
> NSA.
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev

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  reply	other threads:[~2016-06-28 21:40 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-28  2:31 [bitcoin-dev] BIP 151 use of HMAC_SHA512 Rusty Russell
2016-06-28  7:17 ` [bitcoin-dev] BIP 151 Eric Voskuil
2016-06-28  8:26   ` Jonas Schnelli
2016-06-28 16:45     ` Eric Voskuil
2016-06-28 18:22       ` Peter Todd
2016-06-28 18:35         ` Eric Voskuil
2016-06-28 20:14           ` Peter Todd
2016-06-28 20:29             ` Eric Voskuil
2016-06-28 20:36               ` Peter Todd
2016-06-28 21:22                 ` Eric Voskuil
2016-06-28 21:36                   ` Gregory Maxwell
2016-06-28 21:40                     ` Cameron Garnham [this message]
2016-06-28 22:07                       ` Eric Voskuil
2016-06-28 22:33                         ` Cameron Garnham
2016-06-28 23:29                           ` Eric Voskuil
2016-06-29  0:06                             ` Nick ODell
2016-06-28 21:59                     ` Eric Voskuil
     [not found]                       ` <CAAS2fgQ0Ocs8hF+pf+fWfkKKhQwxNKpY=JHpb_bwua7neVO8tg@mail.gmail.com>
2016-06-28 23:34                         ` Eric Voskuil
2016-06-28 20:06       ` Jonas Schnelli
2016-06-28 23:31         ` Eric Voskuil
2016-06-29 11:17       ` Alfie John
2016-06-30 11:56         ` Eric Voskuil
2016-06-30 12:20           ` Jonas Schnelli
2016-06-30 12:27             ` Eric Voskuil
2016-06-30 12:43               ` Jonas Schnelli
2016-06-30 15:22                 ` Eric Voskuil
2016-06-30 16:52                   ` Peter Todd
2016-06-30 18:25                     ` Eric Voskuil
2016-06-30 19:06                       ` Peter Todd
2016-06-30 20:26                         ` Eric Voskuil
2016-06-28 19:55     ` Gregory Maxwell
2016-06-28 23:33       ` Eric Voskuil
2016-06-29  1:01         ` Gregory Maxwell
2016-06-30  9:57           ` Eric Voskuil
2016-06-30 13:03             ` Pieter Wuille
2016-06-30 15:10               ` Eric Voskuil
2016-08-31 14:29                 ` Pieter Wuille
2016-06-30 13:36             ` Erik Aronesty
2016-06-30 14:47               ` Alfie John
2016-07-02  9:44               ` Chris Priest
2016-06-28 12:13   ` Jonas Schnelli
2016-06-28 17:39     ` Eric Voskuil
2016-06-28  7:19 ` [bitcoin-dev] BIP 151 use of HMAC_SHA512 Jonas Schnelli
2016-06-28  8:31   ` Arthur Chen
2016-06-29 18:34     ` Jonas Schnelli
2016-06-29 20:13       ` Peter Todd
2016-06-29 20:31         ` Jonas Schnelli
2016-06-29  1:00   ` Rusty Russell
2016-06-29  1:38     ` Arthur Chen
2016-06-29  1:56     ` Ethan Heilman
2016-06-29  6:58       ` Pieter Wuille
2016-06-29 14:38         ` Ethan Heilman
2016-06-29 18:46           ` Jonas Schnelli
2016-07-01  3:25       ` Rusty Russell
2016-07-01 22:42         ` Zooko Wilcox
2016-07-04  1:23           ` Arthur Chen
2016-07-04  1:44             ` Arthur Chen
2016-07-04  6:47               ` Jonas Schnelli
2016-07-04  6:37           ` Jonas Schnelli

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