From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WTvQa-0001M0-Sz for bitcoin-development@lists.sourceforge.net; Sat, 29 Mar 2014 15:44:12 +0000 X-ACL-Warn: Received: from qmta07.westchester.pa.mail.comcast.net ([76.96.62.64]) by sog-mx-2.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1WTvQZ-000314-Gm for bitcoin-development@lists.sourceforge.net; Sat, 29 Mar 2014 15:44:12 +0000 Received: from omta01.westchester.pa.mail.comcast.net ([76.96.62.11]) by qmta07.westchester.pa.mail.comcast.net with comcast id jScG1n0040EZKEL57Tk6eW; Sat, 29 Mar 2014 15:44:06 +0000 Received: from crushinator.localnet ([IPv6:2601:6:4800:47f:219:d1ff:fe75:dc2f]) by omta01.westchester.pa.mail.comcast.net with comcast id jTk51n00U4VnV2P3MTk6oN; Sat, 29 Mar 2014 15:44:06 +0000 From: Matt Whitlock To: Watson Ladd Date: Sat, 29 Mar 2014 11:44:05 -0400 Message-ID: <4906130.DUyjhm1C93@crushinator> User-Agent: KMail/4.12.3 (Linux/3.12.13-gentoo; KDE/4.12.3; x86_64; ; ) In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Spam-Score: 0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [76.96.62.64 listed in list.dnswl.org] 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: 1WTvQZ-000314-Gm Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Presenting a BIP for Shamir's Secret Sharing of Bitcoin private keys 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: Sat, 29 Mar 2014 15:44:13 -0000 On Saturday, 29 March 2014, at 11:08 am, Watson Ladd wrote: > https://freedom-to-tinker.com/blog/stevenag/new-research-better-wallet-security-for-bitcoin/ Thanks. This is great, although it makes some critical references to an ACM paper for which no URL is provided, and thus I cannot implement it. A distributed ECDSA notwithstanding, we still need a way to decompose a BIP32 master seed into shares. I am envisioning a scenario in which I might meet my sudden and untimely demise, and I wish to allow my beneficiaries to reconstruct my wallet's master seed after my death. I would like to distribute seed shares to each of my beneficiaries and some close friends, such that some subset of the shares must be joined together to reconstitute my master seed. Shamir's Secret Sharing Scheme is perfect for this use case. I am presently working on extending my draft BIP so that it also applies to BIP32 master seeds of various sizes.