>...if every communications device broadcast a constant stream of data and every other communications device received every bit of data and ignored the (nearly 100%) of it that it didn't care about at the moment, you would eliminate the ability to know who was communicating with whom and when, right? The metadata is gone.
Amateur Radio may address this directly or protocols to model, build upon.
License requirements are also becoming more relaxed, accessible:
Packet radio is a form of packet switching technology used to transmit digital data via radio or wireless communications links. It uses the same concepts of data transmission via Datagram that are fundamental to communications via the Internet, as opposed to the older techniques used by dedicated or switched circuits.
SailMail is radio based e-mail system designed for yacht owners operating beyond line-of-sight radio links to the internet. Much of its underlying technology is built upon the Winlink software originally developed by amateur radio enthusiasts .[1] Operation on SailMail network frequencies requires a license for the Marine Radiotelephone Service.
SSB techniques can also be adapted to frequency-shift and frequency-invert baseband waveforms. These effects were used, in conjunction with other filtering techniques, during World War II as a simple method for speech encryption. Radiotelephone conversations between the US and Britain were intercepted and "decrypted" by the Germans; they included some early conversations between Franklin D. Roosevelt and Churchill. In fact, the signals could be understood directly by trained operators. Largely to allow secure communications between Roosevelt and Churchill, the SIGSALY system of digital encryption was devised.
Today, such simple inversion-based speech encryption techniques are easily decrypted using simple techniques and are no longer regarded as secure.
Amateur radio can't be used since the FCC prohibits the use of encryption or otherwise obfuscating the content of messages.
Also, commercial use of amateur radio is prohibited which means using e.g. an open WiFi access point with your call sign as the SSID could be trouble if someone were to go to amazon.com... it's a gray area though.
Amateur Radio may address this directly or protocols to model, build upon. License requirements are also becoming more relaxed, accessible:
Packet radio is a form of packet switching technology used to transmit digital data via radio or wireless communications links. It uses the same concepts of data transmission via Datagram that are fundamental to communications via the Internet, as opposed to the older techniques used by dedicated or switched circuits.
http://en.wikipedia.org/wiki/Packet_radio
SailMail is radio based e-mail system designed for yacht owners operating beyond line-of-sight radio links to the internet. Much of its underlying technology is built upon the Winlink software originally developed by amateur radio enthusiasts .[1] Operation on SailMail network frequencies requires a license for the Marine Radiotelephone Service.
http://en.wikipedia.org/wiki/Sailmail
SSB as a speech-scrambling technique
SSB techniques can also be adapted to frequency-shift and frequency-invert baseband waveforms. These effects were used, in conjunction with other filtering techniques, during World War II as a simple method for speech encryption. Radiotelephone conversations between the US and Britain were intercepted and "decrypted" by the Germans; they included some early conversations between Franklin D. Roosevelt and Churchill. In fact, the signals could be understood directly by trained operators. Largely to allow secure communications between Roosevelt and Churchill, the SIGSALY system of digital encryption was devised.
Today, such simple inversion-based speech encryption techniques are easily decrypted using simple techniques and are no longer regarded as secure.
http://en.wikipedia.org/wiki/Single-sideband_modulation#SSB_...