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| author | Drak <drak@zikula.org> | 2013-11-05 22:15:27 +0000 |
|---|---|---|
| committer | bitcoindev <bitcoindev@gnusha.org> | 2013-11-05 22:45:02 +0000 |
| commit | 61f13d3f8f564fc6006dc953523e8af943bbc3ed (patch) | |
| tree | 88be6c8e2c03e107cee28db2fbd26489c766ede5 | |
| parent | c6914101dcb7d5188b90190467231032ab0419d1 (diff) | |
| download | pi-bitcoindev-61f13d3f8f564fc6006dc953523e8af943bbc3ed.tar.gz pi-bitcoindev-61f13d3f8f564fc6006dc953523e8af943bbc3ed.zip | |
Re: [Bitcoin-development] Possible Solution To SM Attack
| -rw-r--r-- | 15/7175129c2befd114002f82299f35919d76fe6a | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/15/7175129c2befd114002f82299f35919d76fe6a b/15/7175129c2befd114002f82299f35919d76fe6a new file mode 100644 index 000000000..94e3d3d37 --- /dev/null +++ b/15/7175129c2befd114002f82299f35919d76fe6a @@ -0,0 +1,122 @@ +Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] + helo=mx.sourceforge.net) + by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) + (envelope-from <drak@zikula.org>) id 1VdpMs-0008KX-LB + for bitcoin-development@lists.sourceforge.net; + Tue, 05 Nov 2013 22:45:02 +0000 +Received-SPF: pass (sog-mx-1.v43.ch3.sourceforge.com: domain of zikula.org + designates 209.85.212.179 as permitted sender) + client-ip=209.85.212.179; envelope-from=drak@zikula.org; + helo=mail-wi0-f179.google.com; +Received: from mail-wi0-f179.google.com ([209.85.212.179]) + by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) + (Exim 4.76) id 1VdpMp-0004fJ-Km + for bitcoin-development@lists.sourceforge.net; + Tue, 05 Nov 2013 22:45:01 +0000 +Received: by mail-wi0-f179.google.com with SMTP id hm4so2854002wib.0 + for <bitcoin-development@lists.sourceforge.net>; + Tue, 05 Nov 2013 14:44:53 -0800 (PST) +X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; + d=1e100.net; s=20130820; + h=x-gm-message-state:mime-version:in-reply-to:references:from:date + :message-id:subject:to:content-type; + bh=UfGk+tJoht8DhzVzdiqFzch3lUlO6fNnPNoKtQpowso=; + b=nD84evRaTdQ14RarCM3mI2guyZnVB/blZ775h5UElzSfzZOYeAdNyAu9XfPZlPTFrB + 5XCah9qfVzZM7S/gzSDvYGFKhyIHl4ra39XvcvnHMzzmvwBLaDC58YBvmSp5QOyczw6j + 1KU2Y/0sJs+W2QKJ6pXB8V06+rBRawfRHBv/nXw1LdoygjbqsHivdbqk0RXzfI4k7O5e + Jtgt3BDqmpKFAYbyr4NnCetgIkglHKxNqM3FX3bpu+BzIXZhrW/JhZwdhP9qIG7oZE3F + ene+st9EVahaaNpfJWjh0xdb8BDF8Ra3ypG55aQsYDXqXen6Xm3pCP9uTYybhCnor18l + sW+A== +X-Gm-Message-State: ALoCoQnbYXy030X5pDz0ZVtjgoV5y0AyNfBLFc9nU1AyQP5INXlo6FrHRGcDEqodaEr+NLoKwVBP +X-Received: by 10.180.198.5 with SMTP id iy5mr18567115wic.45.1383689747409; + Tue, 05 Nov 2013 14:15:47 -0800 (PST) +MIME-Version: 1.0 +Received: by 10.194.93.105 with HTTP; Tue, 5 Nov 2013 14:15:27 -0800 (PST) +In-Reply-To: <N1-9eAtMHauq2@Safe-mail.net> +References: <N1-9eAtMHauq2@Safe-mail.net> +From: Drak <drak@zikula.org> +Date: Tue, 5 Nov 2013 22:15:27 +0000 +Message-ID: <CANAnSg2sUfRH0mYEir_XKUz-iOYRpdzNgM-AJ7t-H=SOa4wBig@mail.gmail.com> +To: bitcoin-development@lists.sourceforge.net +Content-Type: multipart/alternative; boundary=047d7b624e2adfc61004ea755fe5 +X-Spam-Score: -0.5 (/) +X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. + See http://spamassassin.org/tag/ for more details. + -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for + sender-domain + -0.0 SPF_PASS SPF: sender matches SPF record + 0.0 URIBL_BLOCKED ADMINISTRATOR NOTICE: The query to URIBL was blocked. + See + http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block + for more information. [URIs: safe-mail.net] + 1.0 HTML_MESSAGE BODY: HTML included in message +X-Headers-End: 1VdpMp-0004fJ-Km +Subject: Re: [Bitcoin-development] Possible Solution To SM Attack +X-BeenThere: bitcoin-development@lists.sourceforge.net +X-Mailman-Version: 2.1.9 +Precedence: list +List-Id: <bitcoin-development.lists.sourceforge.net> +List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, + <mailto:bitcoin-development-request@lists.sourceforge.net?subject=unsubscribe> +List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum_name=bitcoin-development> +List-Post: <mailto:bitcoin-development@lists.sourceforge.net> +List-Help: <mailto:bitcoin-development-request@lists.sourceforge.net?subject=help> +List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, + <mailto:bitcoin-development-request@lists.sourceforge.net?subject=subscribe> +X-List-Received-Date: Tue, 05 Nov 2013 22:45:02 -0000 + +--047d7b624e2adfc61004ea755fe5 +Content-Type: text/plain; charset=UTF-8 + +On 5 November 2013 20:51, <colj@safe-mail.net> wrote: + +> Possible Solution: +> If N amount of blocks built of the same previous block are received within +> a time frame of T mine on the block with the lowest hash. +> +> Logic: +> In order for Alice to pull of this attack she not only has to propagate +> her blocks first she must also ensure her blocks are of the smallest hash. +> +> Alice would now have to decrease her target to pull of this attack. Since +> she has a lower target it will take her longer to find a valid block +> negating her time advantage. + + +If I understand the issue properly, this seems like a pretty elegant +solution: if two blocks are broadcast within a certain period of eachother, +chose the lower target. That's a provable fair way of randomly choosing the +winning block and would seem like a pretty simply patch. + +Drak + +--047d7b624e2adfc61004ea755fe5 +Content-Type: text/html; charset=UTF-8 +Content-Transfer-Encoding: quoted-printable + +<div dir=3D"ltr">On 5 November 2013 20:51,=C2=A0<span dir=3D"ltr"><<a hr= +ef=3D"mailto:colj@safe-mail.net" target=3D"_blank">colj@safe-mail.net</a>&g= +t;</span>=C2=A0wrote:<br><div class=3D"gmail_extra"><div class=3D"gmail_quo= +te"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bor= +der-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:sol= +id;padding-left:1ex"> + +Possible Solution:<br>If N amount of blocks built of the same previous bloc= +k are received within a time frame of T mine on the block with the lowest h= +ash.<br><br>Logic:<br>In order for Alice to pull of this attack she not onl= +y has to propagate her blocks first she must also ensure her blocks are of = +the smallest hash.<br> + +<br>Alice would now have to decrease her target to pull of this attack. Sin= +ce she has a lower target it will take her longer to find a valid block neg= +ating her time advantage.</blockquote><div><br></div><div>If I understand t= +he issue properly, this seems like a pretty elegant solution: if two blocks= + are broadcast within a certain period of eachother, chose the lower target= +. That's a provable fair way of randomly choosing the winning block and= + would seem like a pretty simply patch.</div> + +<div><br></div><div>Drak</div></div></div></div> + +--047d7b624e2adfc61004ea755fe5-- + + |