[148090] in cryptography@c2.net mail archive
Re: [Cryptography] randomness +- entropy
daemon@ATHENA.MIT.EDU (David Johnston)
Fri Nov 8 16:19:09 2013
X-Original-To: cryptography@metzdowd.com
Date: Fri, 08 Nov 2013 13:01:58 -0800
From: David Johnston <dj@deadhat.com>
To: cryptography@metzdowd.com
In-Reply-To: <ACF29151-E278-467A-AA43-694F9DDDDF06@lrw.com>
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On 11/7/2013 11:08 AM, Jerry Leichter wrote:
> The smartphone and the embedded system are*very* different. Any phone has a microphone and a radio. Unfortunately, the radios are usually sealed off so you couldn't use them as a source of radio noise; but the microphones are wide open.
I disagree about the 'sealed-off' thing.
I have championed the use of the radio as an entropy source in several
wireless product developments. Most wireless modems have a symbol error
vector register that is trivial to read. I have never found it to be a
technical problem. The problem lays in having the right engineers aware
of the need.
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<div class="moz-cite-prefix">On 11/7/2013 11:08 AM, Jerry Leichter
wrote:<br>
</div>
<blockquote cite="mid:ACF29151-E278-467A-AA43-694F9DDDDF06@lrw.com"
type="cite">
<pre wrap="">The smartphone and the embedded system are <b class="moz-txt-star"><span class="moz-txt-tag">*</span>very<span class="moz-txt-tag">*</span></b> different. Any phone has a microphone and a radio. Unfortunately, the radios are usually sealed off so you couldn't use them as a source of radio noise; but the microphones are wide open.</pre>
</blockquote>
I disagree about the 'sealed-off' thing.<br>
<br>
I have championed the use of the radio as an entropy source in
several wireless product developments. Most wireless modems have a
symbol error vector register that is trivial to read. I have never
found it to be a technical problem. The problem lays in having the
right engineers aware of the need.<br>
<br>
<br>
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