XPost: comp.dsp, sci.crypt, sci.electronics.design   
   From: OneBigLever@InfiniteSeries.Org   
      
   On Fri, 18 Dec 2009 05:58:13 -0500, "Michael A. Terrell"   
    wrote:   
      
   >   
   >glen herrmannsfeldt wrote:   
   >>   
   >> In comp.dsp Mark  wrote:   
   >> (someone wrote)   
   >>   
   >> >> Passing encrypted video over a satellite network built for unencrypted   
   >> >> analog video is not a trivial challenge. As far as I know, there   
   >> >> exists no scheme to do this that has not been broken already.   
   >> (snip)   
   >>   
   >> > um,, is that why General Instrument was able to do it did it 15   
   >> > years ago for HBO?   
   >>   
   >> He said "that has not been broken already".  As far as I know,   
   >> both the analog in digital encryptions have been broken.   
   >>   
   >> It slows down most people, though, so it still works.   
   >>   
   >> The usual analog encryption reverses the polarity of some scan   
   >> lines and/or frames.  It isn't hard to figure out fairly reliably   
   >> a polarity reversal.   
   >>   
   >> -- glen   
   >   
   >   Videocipher-I was digital video & audio.  Videocipher-II was analog.   
      
      
     You're an idiot.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)