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	<52756B2E.7030505@corganlabs.com>
Date: Wed, 6 Nov 2013 04:38:59 +0100
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From: Melvin Carvalho <melvincarvalho@gmail.com>
To: Johnathan Corgan <johnathan@corganlabs.com>
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Cc: bitcoingrant@gmx.com,
	Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Message Signing based authentication
Precedence: list

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On 2 November 2013 22:14, Johnathan Corgan <johnathan@corganlabs.com> wrote:

> On 11/01/2013 10:01 PM, bitcoingrant@gmx.com wrote:
>
> > Server provides a token for the client to sign.
>
> Anyone else concerned about signing an arbitrary string?  Could be a
> hash of $EVIL_DOCUMENT, no?  I'd want to XOR the string with my own
> randomly generated nonce, sign that, then pass the nonce and the
> signature back to the server for verification.
>

Good point.

There are actually times you may want to sign a transaction.

There's a little know HTTP code, 402, "Payment Required".  We should really
start using this at some point ...

http://en.wikipedia.org/wiki/List_of_HTTP_status_codes

Reserved for future use.[2] The original intention was that this code might
be used as part of some form of digital cash or micropayment scheme, but
that has not happened, and this code is not usually used. As an example of
its use, however, Apple's defunct MobileMe service generated a 402 error if
the MobileMe account was delinquent.[citation needed] In addition, YouTube
uses this status if a particular IP address has made excessive requests,
and requires the person to enter a CAPTCHA.


>
> --
> Johnathan Corgan, Corgan Labs
> SDR Training and Development Services
> http://corganlabs.com
>
>
> ------------------------------------------------------------------------------
> Android is increasing in popularity, but the open development platform that
> developers love is also attractive to malware creators. Download this white
> paper to learn more about secure code signing practices that can help keep
> Android apps secure.
> http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>

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Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On 2 November 2013 22:14, Johnathan Corgan <span dir=3D"ltr">&lt;<a=
 href=3D"mailto:johnathan@corganlabs.com" target=3D"_blank">johnathan@corga=
nlabs.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex"><div class=3D"im">On 11/0=
1/2013 10:01 PM, <a href=3D"mailto:bitcoingrant@gmx.com">bitcoingrant@gmx.c=
om</a> wrote:<br>

<br>
&gt; Server provides a token for the client to sign.<br>
<br>
</div>Anyone else concerned about signing an arbitrary string? =A0Could be =
a<br>
hash of $EVIL_DOCUMENT, no? =A0I&#39;d want to XOR the string with my own<b=
r>
randomly generated nonce, sign that, then pass the nonce and the<br>
signature back to the server for verification.<br></blockquote><div><br></d=
iv><div>Good point.<br><br></div><div>There are actually times you may want=
 to sign a transaction.<br><br></div><div>There&#39;s a little know HTTP co=
de, 402, &quot;Payment Required&quot;.=A0 We should really start using this=
 at some point ...<br>
<br><a href=3D"http://en.wikipedia.org/wiki/List_of_HTTP_status_codes">http=
://en.wikipedia.org/wiki/List_of_HTTP_status_codes</a><br><br>Reserved for =
future use.[2] The original intention was that this code might be used as p=
art of some form of digital cash or micropayment scheme, but that has not h=
appened, and this code is not usually used. As an example of its use, howev=
er, Apple&#39;s defunct MobileMe service generated a 402 error if the Mobil=
eMe account was delinquent.[citation needed] In addition, YouTube uses this=
 status if a particular IP address has made excessive requests, and require=
s the person to enter a CAPTCHA.<br>
</div><div>=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<span class=3D""><font color=3D"#888888"><br>
--<br>
Johnathan Corgan, Corgan Labs<br>
SDR Training and Development Services<br>
<a href=3D"http://corganlabs.com" target=3D"_blank">http://corganlabs.com</=
a><br>
</font></span><br>---------------------------------------------------------=
---------------------<br>
Android is increasing in popularity, but the open development platform that=
<br>
developers love is also attractive to malware creators. Download this white=
<br>
paper to learn more about secure code signing practices that can help keep<=
br>
Android apps secure.<br>
<a href=3D"http://pubads.g.doubleclick.net/gampad/clk?id=3D65839951&amp;iu=
=3D/4140/ostg.clktrk" target=3D"_blank">http://pubads.g.doubleclick.net/gam=
pad/clk?id=3D65839951&amp;iu=3D/4140/ostg.clktrk</a><br>___________________=
____________________________<br>

Bitcoin-development mailing list<br>
<a href=3D"mailto:Bitcoin-development@lists.sourceforge.net">Bitcoin-develo=
pment@lists.sourceforge.net</a><br>
<a href=3D"https://lists.sourceforge.net/lists/listinfo/bitcoin-development=
" target=3D"_blank">https://lists.sourceforge.net/lists/listinfo/bitcoin-de=
velopment</a><br>
<br></blockquote></div><br></div></div>

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