Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1XAVQD-00074d-0D for bitcoin-development@lists.sourceforge.net; Fri, 25 Jul 2014 02:39:49 +0000 Received-SPF: pass (sog-mx-1.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.217.182 as permitted sender) client-ip=209.85.217.182; envelope-from=gmaxwell@gmail.com; helo=mail-lb0-f182.google.com; Received: from mail-lb0-f182.google.com ([209.85.217.182]) by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1XAVQC-0004ci-6K for bitcoin-development@lists.sourceforge.net; Fri, 25 Jul 2014 02:39:48 +0000 Received: by mail-lb0-f182.google.com with SMTP id z11so2858591lbi.41 for ; Thu, 24 Jul 2014 19:39:41 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.152.36.74 with SMTP id o10mr13576738laj.52.1406255981562; Thu, 24 Jul 2014 19:39:41 -0700 (PDT) Received: by 10.112.35.138 with HTTP; Thu, 24 Jul 2014 19:39:41 -0700 (PDT) In-Reply-To: References: <53D1AF6C.7010802@gmail.com> Date: Thu, 24 Jul 2014 19:39:41 -0700 Message-ID: From: Gregory Maxwell To: Aaron Voisine Content-Type: text/plain; charset=UTF-8 X-Spam-Score: -1.6 (-) 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 (gmaxwell[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 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 X-Headers-End: 1XAVQC-0004ci-6K Cc: "bitcoin-development@lists.sourceforge.net" , Ron OHara Subject: Re: [Bitcoin-development] Time 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: Fri, 25 Jul 2014 02:39:49 -0000 On Thu, Jul 24, 2014 at 7:35 PM, Aaron Voisine wrote: > The upcoming release of breadwallet uses the height of the blockchain to > enforce timed pin code lockouts for preventing an attacker from quickly > making multiple pin guesses. This prevents them changing the devices system > time to get around the lockout period. Is breadwallet tamper resistant & zero on tamper hardware? otherwise this sounds like security theater.... I attach a debugger to the process (or modify the program) and ignore the block sourced time.