Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1TR829-0004MG-U1 for bitcoin-development@lists.sourceforge.net; Wed, 24 Oct 2012 20:58:37 +0000 Received-SPF: pass (sog-mx-4.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.212.175 as permitted sender) client-ip=209.85.212.175; envelope-from=mh.in.england@gmail.com; helo=mail-wi0-f175.google.com; Received: from mail-wi0-f175.google.com ([209.85.212.175]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1TR829-0001R7-0R for bitcoin-development@lists.sourceforge.net; Wed, 24 Oct 2012 20:58:37 +0000 Received: by mail-wi0-f175.google.com with SMTP id hq4so4105226wib.10 for ; Wed, 24 Oct 2012 13:58:31 -0700 (PDT) MIME-Version: 1.0 Received: by 10.216.201.156 with SMTP id b28mr10509573weo.4.1351112310921; Wed, 24 Oct 2012 13:58:30 -0700 (PDT) Sender: mh.in.england@gmail.com Received: by 10.216.236.30 with HTTP; Wed, 24 Oct 2012 13:58:30 -0700 (PDT) In-Reply-To: References: <20121024162255.GA30290@vps7135.xlshosting.net> <20121024171104.GA31766@vps7135.xlshosting.net> Date: Wed, 24 Oct 2012 22:58:30 +0200 X-Google-Sender-Auth: -FvMBwGYYzRtz-_huKwi1_0nrRA Message-ID: From: Mike Hearn To: Gavin Andresen Content-Type: text/plain; charset=UTF-8 X-Spam-Score: -1.5 (-) 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 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (mh.in.england[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.0 AWL AWL: From: address is in the auto white-list X-Headers-End: 1TR829-0001R7-0R Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Draft BIP for Bloom filtering X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Oct 2012 20:58:38 -0000 > What is the worst-case for an attacker interested in trying to get you > to saturate your upstream bandwidth or use lots of memory? Set a > bloom filter that matches everything, and then start requesting old > blocks in the chain? It would be slightly worse than shipping a full block but not seriously so. If you just want to saturate bandwidth or disk IOPS you could probably just request random blocks over and over again.