XPost: comp.dsp, sci.crypt, sci.electronics.design   
   From: gah@ugcs.caltech.edu   
      
   In comp.dsp Eric Jacobsen  wrote:   
   (snip)   
      
   > Yet again, I'm not addressing the encryption, but the link (i.e., air   
   > interface) protocol.  Even in DVB-S and DVB-S2, the air interfaces are   
   > completely independent from the transport layer and the encryption.  If   
   > you make the air interface just a bit pipe, it CAN'T expose the   
   > encryption any more than any using a standardized air interface.   
      
   > Making it difficult to even demodulate the signal, however, provides an   
   > additional barrier to a would-be eavesdropper in that they must,   
   > somehow, figure out how to demodulate the signal.   This includes   
   > figuring out the modulation type, the polynomial of the entropy   
   > scrambler (NOT the same as encryption), the FEC, including any   
   > polynomials, interleavers, or code matrices, any framing, etc., etc.,   
   > etc.   It's a monumental task if you don't also have a modulator with   
   > which to perform detailed experiments, and even if you do the investment   
   > and expertise required make it a pretty high hurdle.   
      
   How many have crashed or been shot down (but not completely destroyed)   
   and been recovered?  That is, assume that they have the hardware and   
   algorithms.   
      
   -- glen   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)