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
|
Return-Path: <jose.femenias@gmail.com>
Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org
[172.17.192.35])
by mail.linuxfoundation.org (Postfix) with ESMTPS id 1FF23F4D
for <bitcoin-dev@lists.linuxfoundation.org>;
Sun, 11 Mar 2018 12:44:52 +0000 (UTC)
X-Greylist: whitelisted by SQLgrey-1.7.6
Received: from mail-wr0-f181.google.com (mail-wr0-f181.google.com
[209.85.128.181])
by smtp1.linuxfoundation.org (Postfix) with ESMTPS id E4C31360
for <bitcoin-dev@lists.linuxfoundation.org>;
Sun, 11 Mar 2018 12:44:50 +0000 (UTC)
Received: by mail-wr0-f181.google.com with SMTP id d10so569455wrf.3
for <bitcoin-dev@lists.linuxfoundation.org>;
Sun, 11 Mar 2018 05:44:50 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025;
h=from:content-transfer-encoding:mime-version:subject:message-id:date
:to; bh=kfiHsPIZP1QIUHROPcKtR6ev4xVMBdioM0vcbZK+OlM=;
b=Atz6D94Orn5xaTzb1hEOVbxxKhLNY7Rvg3PBqa3tm7j4pN/zPRdX3ZGzcczJWXIbJN
YVHkWNEdu7f5wpGFCUD9QEOi+/DUAkIxbw+r+L478e4zDfal01zDSNrZfbejR18PJwM6
xvRWbHVam2UXyHSGMmQ2mRooKkIyjCnzJR67Vwm8l/IM1pdf5K0//6S43aan0YDAATMY
82OEHlDCjI+Y+nn+DDpDppFM7qglhBlB3a80CoR9d5T1H3RLPJFfDQYr8lmhP4UtOqW/
XXC5wvlnFBNo9Bgq7QhvP1qa10lwPsOt4OAB6PgGfpXWo8H35TYHPXqhLfWmWFAJmDMX
zIFQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20161025;
h=x-gm-message-state:from:content-transfer-encoding:mime-version
:subject:message-id:date:to;
bh=kfiHsPIZP1QIUHROPcKtR6ev4xVMBdioM0vcbZK+OlM=;
b=R03sssZTInIRLqs5iItylUUweYSqGzAm2iMY+pqFfy+QD2DraZFJDtFi1zrEPAdLrF
ynoxSci1fVKuG4TSq3/DNvypJHgdPzZXfWF7vKh1wNCMMZpI92qGBNkSWHPcUROSTuIh
aRu6tBiEiJkHpBrlWMC1jgRG1xyxVUvJHlhWchBvINLWT2Q+C+UlgxDsAmyYlioKUTsW
YDZyzkIwLMBbKKfsUWmDsAdsQtObRw45BhBt7nHRX1FZjhadL8YuO9TOLgk1UfXkbk5X
InlDD7OTAIqEYxWB9nIgEs7T/wjVtgvGKIbQbEsZ9wOK6m/HL9vUyn9q8LKnMJAh2wu9
gsuQ==
X-Gm-Message-State: AElRT7Ho5iGodZXHhAC8wSKAGCnYWMhrojbjt09VJMIruuy4yVl3s1Ac
NA1t4Z4TlywBYorCNqmNCa8JvQxx
X-Google-Smtp-Source: AG47ELtOBEBgA3mV5UEMcb4EuuoKqkwUxB+fDkwWLbUbADzFacmF45IQmmb/gcCmXnE9yoWoE84f4w==
X-Received: by 10.223.175.230 with SMTP id y38mr3667662wrd.26.1520772289245;
Sun, 11 Mar 2018 05:44:49 -0700 (PDT)
Received: from [192.168.1.32] ([178.60.38.49])
by smtp.gmail.com with ESMTPSA id k18sm3815775wmd.4.2018.03.11.05.44.48
for <bitcoin-dev@lists.linuxfoundation.org>
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Sun, 11 Mar 2018 05:44:48 -0700 (PDT)
From: =?utf-8?Q?JOSE_FEMENIAS_CA=C3=91UELO?= <jose.femenias@gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Mime-Version: 1.0 (Mac OS X Mail 10.2 \(3259\))
Message-Id: <90096274-9576-4A08-A86A-E1C4F3E3B5DE@gmail.com>
Date: Sun, 11 Mar 2018 13:44:47 +0100
To: bitcoin-dev@lists.linuxfoundation.org
X-Mailer: Apple Mail (2.3259)
X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,
DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM,
RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
smtp1.linux-foundation.org
X-Mailman-Approved-At: Sun, 11 Mar 2018 13:58:08 +0000
Subject: [bitcoin-dev] Bulletproof CT as basis for election voting?
X-BeenThere: bitcoin-dev@lists.linuxfoundation.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Bitcoin Protocol 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: Sun, 11 Mar 2018 12:44:52 -0000
If I understand Bulletproof Confidential Transactions properly, their =
main virtue is being able to hide not the senders/receivers of a coin =
but the amount transferred.
That sounds to me like a perfect use case for an election.
For instance, in my country, every citizen is issued a National ID Card =
with a digital certificate.=20
So, a naive implementation could simply be that the Voting Authority, =
sends a coin (1 coin =3D 1 vote) to each citizen above 18. This would be =
an open transaction, so it is easily auditable.
Later on, each voter sends her coin to her preferred party, as part of a =
Bulletproof CT, along with 0 coins to other parties to disguise her =
vote.
In the end, each party will accrue as may votes as coins received.
Is there any gotcha I=E2=80=99m missing here? Are there any missing =
features required in Bulletproof to support this use case?=
|