[146664] in cryptography@c2.net mail archive
[Cryptography] Why prefer symmetric crypto over public key crypto?
daemon@ATHENA.MIT.EDU (Jaap-Henk Hoepman)
Fri Sep 6 13:22:23 2013
X-Original-To: cryptography@metzdowd.com
From: Jaap-Henk Hoepman <jhh@cs.ru.nl>
In-Reply-To: <F53C6F1A867F954087D038BD2E12BEB918DB1B70E2@fs01.ri.local>
Date: Fri, 6 Sep 2013 15:13:17 +0200
To: Crypto <cryptography@metzdowd.com>
Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com
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In this oped in the Guardian
http://www.theguardian.com/world/2013/sep/05/nsa-how-to-remain-secure-survei=
llance
Bruce Schneier writes: "Prefer symmetric cryptography over public-key crypto=
graphy." The only reason I can think of is that for public key crypto you ty=
pically use an American (and thus subverted) CA to get the recipients public=
key.=20
What other reasons could there be for this advice?
Best,
Jaap-Henk
(I apologise for typos and being terse; this mail was written on an iPad)
--
Jaap-Henk Hoepman
TNO, Groningen &=20
Dept. of Computer Science=20
Radboud University Nijmegen=20
(m) jhh@cs.ru.nl=20
(w) www.cs.ru.nl/~jhh
(m) jaap-henk.hoepman@tno.nl
(t) +31 6 20619554
(t) @xotoxot=
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div><span></span></div><div><meta http-equ=
iv=3D"content-type" content=3D"text/html; charset=3Dutf-8"><div style=3D"-we=
bkit-text-size-adjust: auto; ">In this oped in the Guardian</div><div style=3D=
"-webkit-text-size-adjust: auto; "><br></div><div style=3D"-webkit-text-size=
-adjust: auto; "><a href=3D"http://www.theguardian.com/world/2013/sep/05/nsa=
-how-to-remain-secure-surveillance">http://www.theguardian.com/world/2013/se=
p/05/nsa-how-to-remain-secure-surveillance</a></div><div style=3D"-webkit-te=
xt-size-adjust: auto; "><br></div><div style=3D"-webkit-text-size-adjust: au=
to; ">Bruce Schneier writes: "<span style=3D"background-color: rgba(255=
, 255, 255, 0); ">Prefer symmetric cryptography over public-key cryptography=
." The only reason I can think of is that for public key crypto you typicall=
y use an American (and thus subverted) CA to get the recipients public key.&=
nbsp;</span></div><div style=3D"-webkit-text-size-adjust: auto; "><span styl=
e=3D"background-color: rgba(255, 255, 255, 0); "><br></span></div><div style=
=3D"-webkit-text-size-adjust: auto; "><span style=3D"background-color: rgba(=
255, 255, 255, 0); ">What other reasons could there be for this advice?</spa=
n></div><div style=3D"-webkit-text-size-adjust: auto; "><span style=3D"backg=
round-color: rgba(255, 255, 255, 0); "><br></span></div><div style=3D"-webki=
t-text-size-adjust: auto; "><span style=3D"background-color: rgba(255, 255, 2=
55, 0); ">Best,</span></div><div style=3D"-webkit-text-size-adjust: auto; ">=
Jaap-Henk</div><div><br><span style=3D"-webkit-text-size-adjust: auto;">(I a=
pologise for typos and being terse; this mail was written on an iPad)</span>=
<div style=3D"-webkit-text-size-adjust: auto; "><div><br></div><div>--</div>=
<div><span style=3D"background-color: rgba(255, 255, 255, 0);">Jaap-Henk Hoe=
pman<br>TNO, Groningen & <br>Dept. of Computer Science <br>Rad=
boud University Nijmegen <br>(m) <a href=3D"mailto:jhh@cs.ru.nl" x=
-apple-data-detectors=3D"true" x-apple-data-detectors-type=3D"link" x-apple-=
data-detectors-result=3D"1">jhh@cs.ru.nl</a> <br>(w) <a href=3D"ht=
tp://www.cs.ru.nl/~jhh" x-apple-data-detectors=3D"true" x-apple-data-detecto=
rs-type=3D"link" x-apple-data-detectors-result=3D"2">www.cs.ru.nl/~jhh</a><b=
r>(m) <a href=3D"mailto:jaap-henk.hoepman@tno.nl" x-apple-data-detector=
s=3D"true" x-apple-data-detectors-type=3D"link" x-apple-data-detectors-resul=
t=3D"3/0">jaap-henk.hoepman@tno.nl</a><br>(t) <a href=3D"tel:+31%2088%2=
0866%207754" x-apple-data-detectors=3D"true" x-apple-data-detectors-type=3D"=
telephone" x-apple-data-detectors-result=3D"3/1">+31 </a>6 20619554<br>=
</span></div></div><div style=3D"-webkit-text-size-adjust: auto; ">(t) @xoto=
xot</div></div></div></body></html>=
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