hi all undetected : high rate spread spectrum, low power unjammable : frequency hoping, long codes with FEC, narrow bandwidth modulation, low bitrate, long range unreadable : robust encryption with anti replay protection, pseudo random generated FH and SS with strong key
do you know LORA ? maybe this could suit your needs https://www.google.fr/search?q=lora+esp32+arduino&source=lnms&sa=X&ved=0ahUKEwjZkZy-3-rfAhVJThoKHZSbAt4Q_AUICSgA&biw=1440&bih=741&dpr=2 bob Le dim. 13 janv. 2019 à 10:10, grarpamp <grarp...@gmail.com> a écrit : > This was mentioned in a whitepaper of sorts, > maybe in a few papers around that time, > noting that the tech might perhaps be ideal for > Anti-Censorship / Anti-Surveillance / Guerrilla > Comms that need to be robust against generally > all forms of traditional radio adversaries. > > Can anyone post links to such papers? > > And what links are there to software and hardware > modules that can be plugged in for experimentation, > and or joined for further development? > > Recollection provides only concept hints, > pasted in below from various. Thanks. > > > > Probably also coming soon, very high PGs wherein the codes, bandwidth and > > frequencies quickly hop according to a shared secret. > > This combination is being explored for possible Next > > Generation military comms. > > It is said that this is already in public knowledge and operation > within SDR community. > > Though instead of the conventional "bandwidth and frequencies", > all the observer sees on their spectrum is random noise, let's say > across entire spectral ranges... from start freq to end freq of entire > frequency range of ATSC / WiFi / Cellular / FM / Etc allocation > space... more generally, across entire start to end of whatever > capability range of the tx / rx hardware in use. And where a > pre shared or negotiated key is used to impart or mask > data into, and out of, the noise. It's not even that these may > have, or be, waveform carriers, as the noise may be spark > gaps driven, impulse / transform function generators, etc. > One might not even have to generate their own noise, > perhaps the RF key could simply be used as filter > to existing noise. > > And the difficulty in triangulating such noise if so, > ie: how exactly does one lock onto random energy, > the galactic radiation problem, from everywhere > and nowhere. > > The concept is that the RF as roughly described in > whatever paper cannot be jammed or DOS'd... your RF > would appear as noise to all but those holding the RF > spectrum noise key, so the only way to jam it, if you > even knew it was in use in the first place (say by noting > an overall spectrum power bump) would be to raise the > noise floor by emitting... you guessed it, random noise... > which would wipe out the S/N dB's you need for your > own comms be they traditional AM / FM / etc, or this > keyed noise tech. So you'd end up in a mutually > assured destruction, essentially who can throw > more power in the air. You'd probably be able to get > more local power up, hop by hop, than a wide area > adversary tying to blanket you, so you'd win. > Assuming you needed to tx anything instead > of just filtering. > > You need the RF noise key to cipher the RF, > so the underlying data packets are always > secure and unaffected by the above. Data would > be affected by nodes that are involved in the > data layer, before it gets pushed up to or down > from RF. That's a trusted evil maid problem and > thus out of scope. > > > https://lists.cpunks.org/pipermail/cypherpunks/2016-February/027605.html > > previous discussions have suggested MIMO for beam forming / phased array > signal emission that lets you do fancy things, like emulate a moving > transmitter. if the transmitter appears to be constantly moving, it's a > much harder target > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- Alban MEFFRE F4GSW
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