[148267] in cryptography@c2.net mail archive
Re: [Cryptography] Explaining PK to grandma
daemon@ATHENA.MIT.EDU (Kelly John Rose)
Tue Nov 26 11:36:08 2013
X-Original-To: cryptography@metzdowd.com
In-Reply-To: <CADpjbE14XE4BSFqCFtTAPWbC41yT990VXQoEJWOajGcO0Mkaxw@mail.gmail.com>
Date: Tue, 26 Nov 2013 09:15:46 -0500
From: Kelly John Rose <iam@kjro.se>
To: David Mercer <radix42@gmail.com>
Cc: Nico Williams <nico@cryptonector.com>,
Cryptography Mailing List <cryptography@metzdowd.com>
Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com
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On Monday, November 25, 2013, David Mercer wrote:
> On Mon, Nov 25, 2013 at 5:10 PM, Nico Williams <nico@cryptonector.com<javascript:_e({}, 'cvml', 'nico@cryptonector.com');>
> > wrote:
>
>>
>> > What am I missing here?
>>
>> Signatures. I don't know of a good analogy for signatures. Anyone?
>>
>
> For signatures how about the kind of stamp you press into a wax seal, and
> a book with pictures of others' stamps as having their public key on your
> keyring? A bit archaic, but grandma is more likely to get this one than
> perhaps some teenagers, as she may have actually seen one used in person.
>
> -David Mercer
>
>
The missing piece here is you can copy such a signature with a good forger.
Public key makes it so copying a signature requires something more.
I think signature is a misnomer in this circumstance.
--
Kelly John Rose
Toronto, ON
Phone: +1 647 638-4104
Twitter: @kjrose
Skype: kjrose.pr
Gtalk: iam@kjro.se
MSN: msn@kjro.se
Document contents are confidential between original recipients and sender.
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<br><br>On Monday, November 25, 2013, David Mercer wrote:<br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D=
"gmail_quote">
On Mon, Nov 25, 2013 at 5:10 PM, Nico Williams <span dir=3D"ltr"><<a hre=
f=3D"javascript:_e({}, 'cvml', 'nico@cryptonector.com');" t=
arget=3D"_blank">nico@cryptonector.com</a>></span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div><br></div><div>
> What am I missing here?<br>
<br>
</div>Signatures. =A0I don't know of a good analogy for signatures. =A0=
Anyone?<br></blockquote><div><br></div><div>For signatures how about the ki=
nd of stamp you press into a wax seal, and a book with pictures of others&#=
39; stamps as having their public key on your keyring? =A0A bit archaic, bu=
t grandma is more likely to get this one than perhaps some teenagers, as sh=
e may have actually seen one used in person.<br>
<br>-David Mercer</div><div><br></div></div></div></div></blockquote><div><=
br></div><div>The missing piece here is you can copy such a signature with =
a good forger. Public key makes it so copying a signature requires somethin=
g more.=A0</div>
<div><br></div><div>I think signature is a misnomer in this circumstance. <=
span></span>=A0</div><br><br>-- <br><div dir=3D"ltr">Kelly John Rose<div>To=
ronto, ON<br>Phone: +1 647 638-4104<br>Twitter: @kjrose<br>Skype: <a href=
=3D"http://kjrose.pr" target=3D"_blank">kjrose.pr</a>
</div><div>Gtalk:=A0<a href=3D"mailto:iam@kjro.se" target=3D"_blank">iam@kj=
ro.se</a></div><div>MSN:=A0<a href=3D"mailto:msn@kjro.se" target=3D"_blank"=
>msn@kjro.se</a><div style=3D"text-align:left"><br></div>Document contents =
are confidential between original recipients and sender.</div>
</div><br>
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