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<p>Eric -</p>
<p>You understood, and yes, the false positives between
flat-dwellers with BT would be obviated somewhat. I was mostly
just spectulating on: A) is there anything intrinsically less safe
about recording (encrypted) BT:Mac addresses and the kind of
mutual handshake required without that (as with sound)... and B)
other "nefarious" ways apps might speak/listen outside human range
to covertly communicate (even while you might be tracking RF
comms... I suppose I am falling back into habits from nearly 30
years inside the belly of a high security environment and/or too
much paranoia about "them" vs "us" (pick your affiliation).</p>
<p>This discussion dovetails nicely with <a moz-do-not-send="true"
href="https://www.smithsonianmag.com/smart-news/human-activity-changing-space-too-180963369/">This
Article</a> on VLF and cosmic radiation...<br>
</p>
<p>Thanks,</p>
<p> - Steve<br>
</p>
<blockquote type="cite"
cite="mid:B10ABA0F-DC09-4996-8D55-C537893617D5@santafe.edu">
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Hi Steve,
<div class=""><br class="">
</div>
<div class="">You probably have read more on this already than I
have, but I believe the reason for using sound rather than
bluetooth is that RF can see through walls, and very
high-frequency sound can’t. They wanted a signal that would be
positive for people in the same interior space, but not for
people who were on opposite sides of a wall through which there
wouldn’t be air connection. </div>
<div class=""><br class="">
</div>
<div class="">I forget where I got that, possibly from the
company’s site, though several months ago.</div>
<div class=""><br class="">
</div>
<div class="">Or did I misunderstand the subject you meant?</div>
<div class=""><br class="">
</div>
<div class="">Thx,</div>
<div class=""><br class="">
</div>
<div class="">E</div>
<div class=""><br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Dec 15, 2020, at 5:43 PM, Steve Smith <<a
href="mailto:sasmyth@swcp.com" class=""
moz-do-not-send="true">sasmyth@swcp.com</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<div class="">
<p class="">Eric -</p>
<p class="">Great story/shout-out to those who
create/maintained a "pocket of sanity" for you. I
feel similarly with the Los Alamos County swimming
pool which manages to be hyper-welcoming whilst
managing things in a convincingly safe manner (w/o
seeming arbitrary?). It helps that there is
chlorinated water everywhere, though I don't know the
relevant concentrations in this case... <br
class="">
</p>
<p class="">Also fascinating that it uses hypersonic
audio (mic and speaker) to exchange "public keys". I
have a camera/app that does this but in the audible
spectrum which is vaguely annoying. In the camera
case it works a bit like a two-factor authentication,
or an ID-free bootstrapping. I think the camera
starts by chattering gibberish that the app hears and
recognizes as "one of it's own" which then triggers
the app or camera to reach out over wifi and make a
connection there. I have a few tone generator apps
and an oscilliscope app which samples the
headphone/mic input... I'm guessing I could kludge a
simple NOVID detector and even do some kind of reverse
engineering of it? I don't see any particular reason
that an audio "detection" is better than a BT one
excepting maybe that the latter can be power hungry
(compared to a frequent ultrasonic chirp? or that the
BT apps use BT:MAC addresses at some level (implying
less privacy)?</p>
<p class="">I'm mildly disturbed by the implications of
a hypersonic "dogwhistle" app, though current low-tech
modes of signaling one's proclivities and loyalties is
plenty effective (Mason's rings, secret handshakes,
code words, etc.)</p>
<p class="">Next thing we'll all be putting bandaids
over our microphones on our devices?<br class="">
</p>
<p class="">- Steve<br class="">
</p>
<p class=""><br class="">
</p>
<div class="moz-cite-prefix">On 12/15/20 12:14 PM, David
Eric Smith wrote:<br class="">
</div>
<blockquote type="cite"
cite="mid:59F46441-D8C1-40A8-8355-A9EC343D04BF@santafe.edu"
class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
Yes, seems to be a good app.
<div class=""><br class="">
</div>
<div class="">Georgia Tech has set up a group account
that one can log into, and it is part of their
campus surveillance system.</div>
<div class=""><br class="">
</div>
<div class="">I do have to stop, and do something
probably nobody on the list has any reason to care
about, to give a shout-out to them. The current GT
monitoring system was designed, I think mostly if
not entirely, by a young biophysics faculty (Josh
Weitz) working with the department head (Greg
Gibson). Since early in the year, maybe April or
May, they have had a streamlined testing pipeline,
and their target (which I think they mostly
approach) is to test the entire on-campus community
weekly. Their positivity return rate during the
summer was around 0.3% for a couple of months; in
the autumn it climbed back up through 0.7% and
toward a percent, and the messages and exhortations
started to come in fast and thick. All that went
together with refitting many buildings, including
the old biology building where my office is, built
in the middle Stone Age, with HEPA filters and UV
irradiators in the HVAC ducts, occupancy protocols,
and various else. Certainly the effort involved was
enormous work from a large number of people, and the
two main guys were mainly designers and participants
in the choreography. But overall it has had the
feeling of a pocket of sanity and good practice that
would have been in place in any number of civilized
countries in the Eastern hemisphere. With the
expected results of providing mostly excellent
protection for a community of people. And that, for
a state school.</div>
<div class=""><br class="">
</div>
<div class="">I do not know (have asked a CDC
epidemiologist friend, who also doesn’t know) how
much efficacy data has been compiled for NOVID-using
communities: that is; what fraction of cases that
would have escaped to potentially transmit, did they
catch and get safely into a quarantine before
anybody else was exposed? Iceland did a great job
of that with manual contact tracing back in the
earliest days. The real figure of merit for NOVID
will be how much of that effect it can contribute
through a decentralized computer app, which at least
offers better scaling cost than manual contact
tracing once the distribution is wide. If somebody
on the list finds good data on that, I would be
interested to know.</div>
<div class=""><br class="">
</div>
<div class="">Eric</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On Dec 15, 2020, at 1:12 PM, Tom
Johnson <<a href="mailto:tom@jtjohnson.com"
class="" moz-do-not-send="true">tom@jtjohnson.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div dir="auto" class="">NOVID is the first
pre-exposure notification app to fight
COVID-19. It’s free, anonymous, and shows
you cases close in your network before
you’re exposed. It only takes one minute to
download. Please visit <a
href="https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fnovid.org&c=E,1,VwlMJTw8gqSVqbo2jJiXmT5NM5NAq_5yttP-l2lMZNpp2VMc6PbSqDKtDArm04wXuOsKAwniiJ1YmGYvBupyCA7hDVU8uZl6NwnstOOkPcPVwTSWJKXWKZ6Q6A,,&typo=1"
class="" moz-do-not-send="true">novid.org</a> </div>
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