Eric - 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).
This discussion dovetails nicely with This Article <https://www.smithsonianmag.com/smart-news/human-activity-changing-space-too-180963369/> on VLF and cosmic radiation... Thanks, - Steve > Hi Steve, > > 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. > > I forget where I got that, possibly from the company’s site, though > several months ago. > > Or did I misunderstand the subject you meant? > > Thx, > > E > > >> On Dec 15, 2020, at 5:43 PM, Steve Smith <[email protected] >> <mailto:[email protected]>> wrote: >> >> Eric - >> >> 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... >> >> 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)? >> >> 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.) >> >> Next thing we'll all be putting bandaids over our microphones on our >> devices? >> >> - Steve >> >> >> On 12/15/20 12:14 PM, David Eric Smith wrote: >>> Yes, seems to be a good app. >>> >>> Georgia Tech has set up a group account that one can log into, and >>> it is part of their campus surveillance system. >>> >>> 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. >>> >>> 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. >>> >>> Eric >>> >>> >>> >>>> On Dec 15, 2020, at 1:12 PM, Tom Johnson <[email protected] >>>> <mailto:[email protected]>> wrote: >>>> >>>> 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 novid.org >>>> <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fnovid.org&c=E,1,VwlMJTw8gqSVqbo2jJiXmT5NM5NAq_5yttP-l2lMZNpp2VMc6PbSqDKtDArm04wXuOsKAwniiJ1YmGYvBupyCA7hDVU8uZl6NwnstOOkPcPVwTSWJKXWKZ6Q6A,,&typo=1> >>>> >>>> - .... . -..-. . -. -.. -..-. .. ... -..-. .... . .-. . >>>> FRIAM Applied Complexity Group listserv >>>> Zoom Fridays 9:30a-12p Mtn GMT-6 bit.ly/virtualfriam >>>> <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fbit.ly%2fvirtualfriam&c=E,1,baT6fL5mvRh3sBH-URiL9A54zPGJk0HsWNRq_1lG5UAnvvrai3-xOfXwbcszoE4xDLNYQdPpQQcVS0lqKKVtkIhG3huGRlj0rDclqBeTPIeYTezk8iU,&typo=1> >>>> un/subscribe >>>> https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fredfish.com%2fmailman%2flistinfo%2ffriam_redfish.com&c=E,1,NNWV74oNkI0ok9wmOSImgEzXKLICWUy3OTxLYJTWPmMkSdZsbnsVF6TPqg619EhCyRo2XWVNeacC8hLpCQRVa3OegAxS8z7OcZ1sm1PQ2BBE&typo=1 >>>> <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fredfish.com%2fmailman%2flistinfo%2ffriam_redfish.com&c=E,1,NNWV74oNkI0ok9wmOSImgEzXKLICWUy3OTxLYJTWPmMkSdZsbnsVF6TPqg619EhCyRo2XWVNeacC8hLpCQRVa3OegAxS8z7OcZ1sm1PQ2BBE&typo=1> >>>> archives: http://friam.471366.n2.nabble.com/ >>>> <http://friam.471366.n2.nabble.com/> >>>> FRIAM-COMIC >>>> https://linkprotect.cudasvc.com/url?a=http%3a%2f%2ffriam-comic.blogspot.com%2f&c=E,1,QC1RhNiZQwzpRlGcKa37hFb5Briw7oPDdXlUnt4m2hosU8LiGWbsGBDvNpyxjSV4bLVS_ctOvUkc7JKNQPqkKW49mSd5DWONzdNjRwvFaW3t1xeozIcQ9nGl_9s,&typo=1 >>>> <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2ffriam-comic.blogspot.com%2f&c=E,1,QC1RhNiZQwzpRlGcKa37hFb5Briw7oPDdXlUnt4m2hosU8LiGWbsGBDvNpyxjSV4bLVS_ctOvUkc7JKNQPqkKW49mSd5DWONzdNjRwvFaW3t1xeozIcQ9nGl_9s,&typo=1> >>>> >>> >>> >>> - .... . -..-. . -. -.. -..-. .. ... -..-. .... . .-. . >>> FRIAM Applied Complexity Group listserv >>> Zoom Fridays 9:30a-12p Mtn GMT-6 bit.ly/virtualfriam >>> <http://bit.ly/virtualfriam> >>> un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>> archives: http://friam.471366.n2.nabble.com/ >>> FRIAM-COMIC http://friam-comic.blogspot.com/ >> - .... . -..-. . -. -.. -..-. .. ... -..-. .... . .-. . >> FRIAM Applied Complexity Group listserv >> Zoom Fridays 9:30a-12p Mtn GMT-6 bit.ly/virtualfriam >> <http://bit.ly/virtualfriam> >> un/subscribe >> https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fredfish.com%2fmailman%2flistinfo%2ffriam_redfish.com&c=E,1,vhDDya7CwJCpGj7_YkCLxdN3Q1w0H7vKaf2NzVGbtzWP8cIyz-6Jg1nMo1MV26J8Pnm6uFqLOKsB8Yrj-5NC3UUuFH4lJHo2GXxNACA_VXXiQg,,&typo=1 >> <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fredfish.com%2fmailman%2flistinfo%2ffriam_redfish.com&c=E,1,vhDDya7CwJCpGj7_YkCLxdN3Q1w0H7vKaf2NzVGbtzWP8cIyz-6Jg1nMo1MV26J8Pnm6uFqLOKsB8Yrj-5NC3UUuFH4lJHo2GXxNACA_VXXiQg,,&typo=1> >> archives: http://friam.471366.n2.nabble.com/ >> <http://friam.471366.n2.nabble.com/> >> FRIAM-COMIC >> https://linkprotect.cudasvc.com/url?a=http%3a%2f%2ffriam-comic.blogspot.com%2f&c=E,1,SdZBjV8YQ8Sn2z6vqgk-GL6CsC9pz3-sv5StrAM3MnfuDH95uqreIeIw-bzv10k-1dF6agCmrf-SoEMcLBexTDzx-5gVOtZYAn26QkewlRSd3lpGpA,,&typo=1 >> <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2ffriam-comic.blogspot.com%2f&c=E,1,SdZBjV8YQ8Sn2z6vqgk-GL6CsC9pz3-sv5StrAM3MnfuDH95uqreIeIw-bzv10k-1dF6agCmrf-SoEMcLBexTDzx-5gVOtZYAn26QkewlRSd3lpGpA,,&typo=1> >> > > > - .... . -..-. . -. -.. -..-. .. ... -..-. .... . .-. . > FRIAM Applied Complexity Group listserv > Zoom Fridays 9:30a-12p Mtn GMT-6 bit.ly/virtualfriam > un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com > archives: http://friam.471366.n2.nabble.com/ > FRIAM-COMIC http://friam-comic.blogspot.com/
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