That kind of technology is already widely deployed in walkie talkies -
   I think I remember at HOPE a speaker mentioning that the NYPD used this
   technique until they abandoned it due to its inconvenience.
   [1]http://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum

   On Wed, Sep 25, 2013 at 1:50 PM, grarpamp <[2]grarpamp@gmail.com>
   wrote:

   On 9/25/13, John Young <[3]jya@pipeline.com> wrote:
   > Now that it appears the Internet is compromised what other
   > means can rapidly deliver tiny fragments of an encrypted
   > message, each unique for transmission, then reassembled
   > upon receipt, kind of like packets but much smaller and less
   > predictable, dare say random?
   >
   > The legacy transceiver technologies prior to the Internet or
   > developed parallel to it, burst via radio, microwave, EM emanations,
   > laser, ELF, moon or planetary bounce, spread spectrum, ELF,
   > hydro, olfactory, quanta, and the like.
   >
   > Presumably if these are possible they will remain classified, kept
   > in research labs for advanced study, or shelved for future use.

     There is a spread spectrum radio tech where you broadcast on
     essentially all frequencies / wideband at once. To the eavesdropper
     it appears as simply a rise in unlocatable background noise levels.
     Yet there is a twist... you and your peer posess a crypto key. That
     key is used to select and form a broadcast/reception frequency map
     over the entire spectrum. You drive it with software radio. Think of
     the
     map as a vertically slotted grille mask over your spectrum analyzer.
     The grille spacing/width/overlap is random. What you see is your
     distributed signal hidden in the noise. Pass it down your stack
     for further processing and decoding.
     It's been a while since I've seen this described, whether formally,
     or
     applied. Link to paper[s] covering the topic would be appreciated.

   --
   Rich Jones
   [4]OpenWatch is a global citizen news network. Download OpenWatch
   [5]for iOS and [6]for Android!

References

   1. http://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum
   2. mailto:grarpamp@gmail.com
   3. mailto:jya@pipeline.com
   4. https://openwatch.net/
   5. https://itunes.apple.com/us/app/openwatch-social-muckraking/id642680756?ls=1&mt=8
   6. https://play.google.com/store/apps/details?id=org.ale.openwatch&hl=en