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From: Tamas Blummer <tamas@bitsofproof.com>
In-Reply-To: <1878927.J1e3zZmtIP@crushinator>
Date: Sat, 29 Mar 2014 09:34:25 +0100
Message-Id: <44EBAC86-71C4-4380-8131-EE604A0E6D74@bitsofproof.com>
References: <1878927.J1e3zZmtIP@crushinator>
To: Matt Whitlock <bip@mattwhitlock.name>
Cc: bitcoin-development@lists.sourceforge.net
Subject: Re: [Bitcoin-development] Presenting a BIP for Shamir's Secret
	Sharing of Bitcoin private keys
Precedence: list


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Great stuff Matt!

I have an implementation of Shamir's Secret Sharing here: =
https://github.com/bitsofproof/bop-bitcoin-client-misc/blob/master/src/mai=
n/java/com/bitsofproof/supernode/misc/ShamirsSecretSharing.java

What was missing was nice serialization. Thanks a lot for defining and =
starting the process.

 I will shortly adapt my code and check your test vectors.

Regards,

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.
>=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


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Great =
stuff Matt!<div><br><div apple-content-edited=3D"true">I have an =
implementation of Shamir's Secret Sharing here:&nbsp;<a =
href=3D"https://github.com/bitsofproof/bop-bitcoin-client-misc/blob/master=
/src/main/java/com/bitsofproof/supernode/misc/ShamirsSecretSharing.java">h=
ttps://github.com/bitsofproof/bop-bitcoin-client-misc/blob/master/src/main=
/java/com/bitsofproof/supernode/misc/ShamirsSecretSharing.java</a></div><d=
iv apple-content-edited=3D"true"><br></div><div =
apple-content-edited=3D"true">What was missing was nice =
serialization.&nbsp;Thanks a lot for defining and starting the =
process.</div><div apple-content-edited=3D"true"><br></div><div =
apple-content-edited=3D"true">&nbsp;I will shortly adapt my code and =
check your test vectors.<br><br style=3D"color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: medium; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
"><span style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
medium; font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: 2; text-align: =
-webkit-auto; text-indent: 0px; text-transform: none; white-space: =
normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px; display: inline !important; float: none; =
">Regards,</span><br style=3D"color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: medium; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: =
none; white-space: normal; widows: 2; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><br =
style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: 2; text-align: =
-webkit-auto; text-indent: 0px; text-transform: none; white-space: =
normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px; "><span style=3D"color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: medium; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
display: inline !important; float: none; ">Tamas Blummer</span><br =
style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: 2; text-align: =
-webkit-auto; text-indent: 0px; text-transform: none; white-space: =
normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px; "><span style=3D"color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: medium; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
display: inline !important; float: none; "><a =
href=3D"http://bitsofproof.com">http://bitsofproof.com</a></span>
</div>
<br><div><div>On 29.03.2014, at 09:05, Matt Whitlock &lt;<a =
href=3D"mailto:bip@mattwhitlock.name">bip@mattwhitlock.name</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite">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.<br><br>Complete BIP: <a =
href=3D"https://github.com/whitslack/btctool/blob/bip/bip-xxxx.mediawiki">=
https://github.com/whitslack/btctool/blob/bip/bip-xxxx.mediawiki</a><br><b=
r>I am looking to have this BIP assigned a number and added to the =
bitcoin/bips repository. I invite any comments, questions, or =
suggestions.<br><br>------------------------------------------------------=
------------------------<br>______________________________________________=
_<br>Bitcoin-development mailing list<br><a =
href=3D"mailto:Bitcoin-development@lists.sourceforge.net">Bitcoin-developm=
ent@lists.sourceforge.net</a><br>https://lists.sourceforge.net/lists/listi=
nfo/bitcoin-development<br><br></blockquote></div><br></div></body></html>=

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