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Date: Fri, 14 Mar 2014 12:49:19 -0500
Message-ID: <CANg-TZB3snv+ny5NdwMic_NtSbMCvt_=qSViJHXeTsdU2Qnygg@mail.gmail.com>
From: Brooks Boyd <boydb@midnightdesign.ws>
To: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Content-Type: multipart/alternative; boundary=f46d0442885e78258004f494b079
Subject: Re: [Bitcoin-development] Physical key / edge detection software
 and PIN to generate private key
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On Thu, Mar 13, 2014 at 9:38 PM, Jack Scott <jack.scott.public@gmail.com>wrote:

> BIP: XX
> Title: Physical key / edge detection software and PIN to generate a
> Bitcoin private key
> Author: Jack Scott
> Status: Idea
> Type: Standard Track
> Created: 13-3-2014
>
> Abstract:
> A method is proposed to generate a Bitcoin private key by using a physical
> key in conjunction with image recognition software and a PIN.  Use edge
> detection software applied to incoming video feed to convert the shape of a
> physical key into an equation that describes the key.  The hash of the
> key's equation plus a user generated five digit pin can then be used to
> create a Bitcoin private key.
>
>
Interesting idea, though as Wladimir mentioned, a real-world "key" is much
less secure than a Bitcoin/PGP "key", though in this case, I could see your
physical/visual "key" being any complex, high-contrast image (like a Motion
Tracking Target: https://www.google.com/search?q=tracking+markers&tbm=isch),
if just using edge-detection (a high-contrast image would help make
low-light or out-of-focus shots still able to be detected), though like a
QR-code, it should probably have calibration markers in the corners to
specify orientation (would help decoding a skewed or rotated image) and the
standard should enforce some minimum level of complexity to prevent really
simple and easy-to-reproduce/steal keys .

Though if you're getting to that level of complexity, you might as well
just have a QR code of the private key.

Brooks

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Thu, Mar 13, 2014 at 9:38 PM, Jack Scott <span dir=3D"ltr">&lt;<=
a href=3D"mailto:jack.scott.public@gmail.com" target=3D"_blank">jack.scott.=
public@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div dir=3D"ltr">BIP: XX<div>Title: Physical key / edge de=
tection software and PIN to generate a Bitcoin private key</div>
<div>Author: Jack Scott</div><div>Status: Idea</div><div>Type: Standard Tra=
ck</div><div>Created: 13-3-2014</div>
<div><br></div><div>Abstract:</div><div>A method is proposed to generate a =
Bitcoin private key by using a physical key in conjunction with image recog=
nition software and a PIN. =A0Use edge detection software applied to incomi=
ng video feed to convert the shape of a physical key into an equation that =
describes the key. =A0The hash of the key&#39;s equation plus a user genera=
ted five digit pin can then be used to create a Bitcoin private key.</div>

</div>
<br></blockquote><div><br></div><div>Interesting idea, though as Wladimir m=
entioned, a real-world &quot;key&quot; is much less secure than a Bitcoin/P=
GP &quot;key&quot;, though in this case, I could see your physical/visual &=
quot;key&quot; being any complex, high-contrast image (like a Motion Tracki=
ng Target: <a href=3D"https://www.google.com/search?q=3Dtracking+markers&am=
p;tbm=3Disch">https://www.google.com/search?q=3Dtracking+markers&amp;tbm=3D=
isch</a>), if just using edge-detection (a high-contrast image would help m=
ake low-light or out-of-focus shots still able to be detected), though like=
 a QR-code, it should probably have calibration markers in the corners to s=
pecify orientation (would help decoding a skewed or rotated image) and the =
standard should enforce some minimum level of complexity to prevent really =
simple and easy-to-reproduce/steal keys .</div>
<div><br></div><div>Though if you&#39;re getting to that level of complexit=
y, you might as well just have a QR code of the private key.</div><div><br>=
</div><div>Brooks</div></div></div></div>

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