From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WTost-00018G-S0 for bitcoin-development@lists.sourceforge.net; Sat, 29 Mar 2014 08:44:59 +0000 X-ACL-Warn: Received: from wp059.webpack.hosteurope.de ([80.237.132.66]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1WToss-0005um-2W for bitcoin-development@lists.sourceforge.net; Sat, 29 Mar 2014 08:44:59 +0000 Received: from [37.143.74.116] (helo=[192.168.2.2]); authenticated by wp059.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.0:RSA_AES_128_CBC_SHA1:16) id 1WTosl-0007Xo-HP; Sat, 29 Mar 2014 09:44:51 +0100 Content-Type: multipart/signed; boundary="Apple-Mail=_AB116093-5D86-4F66-B61F-95FFFC22EE13"; protocol="application/pgp-signature"; micalg=pgp-sha1 Mime-Version: 1.0 (Mac OS X Mail 6.6 \(1510\)) From: Tamas Blummer In-Reply-To: <1878927.J1e3zZmtIP@crushinator> Date: Sat, 29 Mar 2014 09:44:53 +0100 Message-Id: References: <1878927.J1e3zZmtIP@crushinator> To: Matt Whitlock X-Mailer: Apple Mail (2.1510) X-bounce-key: webpack.hosteurope.de; tamas@bitsofproof.com; 1396082698; 775f07b9; X-Spam-Score: 1.0 (+) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 1.0 HTML_MESSAGE BODY: HTML included in message X-Headers-End: 1WToss-0005um-2W Cc: bitcoin-development@lists.sourceforge.net 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 08:45:00 -0000 --Apple-Mail=_AB116093-5D86-4F66-B61F-95FFFC22EE13 Content-Type: multipart/alternative; boundary="Apple-Mail=_C3EB1A17-A56F-4642-A57C-406685F45A10" --Apple-Mail=_C3EB1A17-A56F-4642-A57C-406685F45A10 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi Matt, I used Shamir's Secret Sharing to decompose a seed for a BIP32 master = key, that is I think more future relevant than a single key. Therefore suggest to adapt the BIP for a length used there typically 16 = or 32 bytes and have a magic code to indicate its use as key vs. seed. Regards, Tamas Blummer http://bitsofproof.com On 29.03.2014, at 09:05, Matt Whitlock wrote: > Abstract: A method is described for dividing a Bitcoin private key = into shares in a manner such that the key can be reconstituted from any = sufficiently large subset of the shares but such that individually the = shares do not reveal any information about the key. This method is = commonly known as Shamir's Secret Sharing Scheme. Additionally, an = encoding methodology is proposed to standardize transmission and storage = of shares. >=20 > Complete BIP: = https://github.com/whitslack/btctool/blob/bip/bip-xxxx.mediawiki >=20 > I am looking to have this BIP assigned a number and added to the = bitcoin/bips repository. I invite any comments, questions, or = suggestions. >=20 > = --------------------------------------------------------------------------= ---- > _______________________________________________ > Bitcoin-development mailing list > Bitcoin-development@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bitcoin-development >=20 --Apple-Mail=_C3EB1A17-A56F-4642-A57C-406685F45A10 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Hi = Matt,

I used Shamir's Secret Sharing to = decompose a seed for a BIP32 master key, that is I think more future = relevant than a single key.
Therefore suggest to adapt the BIP for a = length used there typically 16 or 32 bytes and have a magic code to = indicate its use as key vs. seed.


Tamas Blummer
http://bitsofproof.com

On 29.03.2014, at 09:05, Matt Whitlock <bip@mattwhitlock.name> = wrote:

Abstract: A method is described for dividing a Bitcoin = private key into shares in a manner such that the key can be = reconstituted from any sufficiently large subset of the shares but such = that individually the shares do not reveal any information about the = key. This method is commonly known as Shamir's Secret Sharing Scheme. = Additionally, an encoding methodology is proposed to standardize = transmission and storage of shares.

Complete BIP: = https://github.com/whitslack/btctool/blob/bip/bip-xxxx.mediawiki
I am looking to have this BIP assigned a number and added to the = bitcoin/bips repository. I invite any comments, questions, or = suggestions.

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Bitcoin-developm= ent@lists.sourceforge.net
https://lists.sourceforge.net/lists/listi= nfo/bitcoin-development


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