1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
Return-Path: <pete@petertodd.org>
Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org
[172.17.192.35])
by mail.linuxfoundation.org (Postfix) with ESMTPS id DF321D58
for <bitcoin-dev@lists.linuxfoundation.org>;
Mon, 11 Jan 2016 06:58:01 +0000 (UTC)
X-Greylist: from auto-whitelisted by SQLgrey-1.7.6
Received: from outmail148113.authsmtp.com (outmail148113.authsmtp.com
[62.13.148.113])
by smtp1.linuxfoundation.org (Postfix) with ESMTP id 493EAA1
for <bitcoin-dev@lists.linuxfoundation.org>;
Mon, 11 Jan 2016 06:58:00 +0000 (UTC)
Received: from mail-c247.authsmtp.com (mail-c247.authsmtp.com [62.13.128.247])
by punt22.authsmtp.com (8.14.2/8.14.2/) with ESMTP id u0B6vsCl032480;
Mon, 11 Jan 2016 06:57:54 GMT
Received: from petertodd.org (ec2-52-5-185-120.compute-1.amazonaws.com
[52.5.185.120]) (authenticated bits=0)
by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id u0B6vqrA004769
(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
Mon, 11 Jan 2016 06:57:53 GMT
Received: from [127.0.0.1] (localhost [127.0.0.1])
by petertodd.org (Postfix) with ESMTPSA id A44E541EDB;
Mon, 11 Jan 2016 06:54:59 +0000 (UTC)
In-Reply-To: <87fuy4hip0.fsf@rustcorp.com.au>
References: <CABsx9T3aTme2EQATamGGzeqNqJkUcPGa=0LVidJSRYNznM-myQ@mail.gmail.com>
<CAPg+sBhH0MODjjp8Avx+Fy_UGqzMjUq_jn3vT3oH=u3711tsSA@mail.gmail.com>
<8760z4rbng.fsf@rustcorp.com.au>
<C4B5B9F1-9C53-45BC-9B30-F572C78096E3@mattcorallo.com>
<8737u8qnye.fsf@rustcorp.com.au>
<CABsx9T1gmz=sr_sEEuy8BQU6SXdmi58O30rzRWNW=0Ej98fi4A@mail.gmail.com>
<20160108153329.GA15731@sapphire.erisian.com.au>
<CABsx9T3MfndREm9icE-TUF58zsRZ5YsBMvUAMy4E-MmYWxWV=A@mail.gmail.com>
<87fuy4hip0.fsf@rustcorp.com.au>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain;
charset=UTF-8
From: Peter Todd <pete@petertodd.org>
Date: Mon, 11 Jan 2016 06:57:42 +0000
To: Rusty Russell <rusty@rustcorp.com.au>,
Rusty Russell via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>,
Gavin Andresen <gavinandresen@gmail.com>, Anthony Towns <aj@erisian.com.au>
Message-ID: <60A90647-86FC-49F5-9FB0-0CAA6A040A4B@petertodd.org>
X-Server-Quench: a310004b-b830-11e5-bcde-0015176ca198
X-AuthReport-Spam: If SPAM / abuse - report it at:
http://www.authsmtp.com/abuse
X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR
bgdMdwMUElQaAgsB AmAbW1JeVVp7XGA7 bghPaBtcak9QXgdq
T0pMXVMcUQUaB1pA RG8eUh11cQwIcX9x YwgzXXFbXER+J1sv
Sk1UCGwHMGJ9OjNL BV1YdwJRcQRMLU5E Y1gxNiYHcQ5VPz4z
GA41ejw8IwAXFCVQ T0kRKhoNRlwRD3Y1 TRcfAX1/RQgPRjl7
JBsiLl8HHUEXekwu LVIqWkl5NAVzDApC SCkA
X-Authentic-SMTP: 61633532353630.1038:706
X-AuthFastPath: 0 (Was 255)
X-AuthSMTP-Origin: 52.5.185.120/25
X-AuthVirus-Status: No virus detected - but ensure you scan with your own
anti-virus system.
X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,LOTS_OF_MONEY,
RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
smtp1.linux-foundation.org
Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Time to worry about 80-bit collision
attacks or not?
X-BeenThere: bitcoin-dev@lists.linuxfoundation.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Bitcoin Development Discussion <bitcoin-dev.lists.linuxfoundation.org>
List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/bitcoin-dev>,
<mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=unsubscribe>
List-Archive: <http://lists.linuxfoundation.org/pipermail/bitcoin-dev/>
List-Post: <mailto:bitcoin-dev@lists.linuxfoundation.org>
List-Help: <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=help>
List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev>,
<mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=subscribe>
X-List-Received-Date: Mon, 11 Jan 2016 06:58:02 -0000
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
On 10 January 2016 22:57:15 GMT-05:00, Rusty
>Cheers,
>Rusty.
>[1] Weirdly, the bitcoin network is doing this much work every 57
> days, for about $92M. If that's all the attack costs, it's under
> 1M in 10 years.
Don't get too caught up in Moore's law here - more likely the attack will become feasible because SHA2 is partially weakened, as happened with SHA1. Having industry standard safety margins would make such a weakening be an academic problem rather than an emergency.
-----BEGIN PGP SIGNATURE-----
iQE9BAEBCgAnIBxQZXRlciBUb2RkIDxwZXRlQHBldGVydG9kZC5vcmc+BQJWk1Jc
AAoJEMCF8hzn9Lncz4MH/RYReh4+oPkt8D4uW2FhiB/BlzY5Q1FP94nyi/jQAAh9
er3cUA47RhSLLd2ukC2XDgbw8CZzhnzECs7vBVsXacc3dGpzV59n8L/pnX47IRJh
i1BPWHzEl/UeE/uBYUVgmy+kCVkJ80gnL2GGgZ3IXL5P+CHYY9dvhBrr53Q3HSpi
aEXVivBvBnX0GeATMVY5TAiailUfsUbUmPdEHu0x5hqqTh0sUpi+R+wXWJfPESB2
hzMVZd8ALz1SJhDqbkmBNHy2CX0fhGlnMSapm6EkQksfshkcwJ7tj8s2CEOYD68T
4mR7Xh+FsOA2bbZP8M/lMd3rrXbwFzXi0rWPa70mxqI=
=2W58
-----END PGP SIGNATURE-----
|
