🚀 go-pugleaf

In article <1993Jan6.225744.17312@linus.mitre.org> hal@venus.mitre.org (Hal Feinstein) writes:
>In article <1993Jan6.133347.310@clark.dgim.doc.ca> nur@mars.dgrc.doc.ca writes:
>>In article 7026@netcom.com, rcain@netcom.com (Robert Cain) writes:
>>
>>What about the modern analog devices that use split band inversion where
>>one of 32 programmable split points in the voice band may be selected
>>and changed at 60 Hz or faster at "random?"  Two separate inversions
>>are performed, one for the lower sideband and one for the upper
>>sideband around the split point.  This seems *much* harder.  This topic
>
>
>These analog voice systems are considered really difficult to break.

   The are difficult to process in real-time.

>scanner crowd out.  When local law wants privacy they usually use 
>something better then rolling code or voice inversion with fixed 
>split bands.  The ones I've used were made by a company called

   Unfortunately, this isn't always true.  Many of the LEAs I've dealth with
who use speech inversion thought it was 'secure,' although some individual
officers who have used CBs thought the inversion was single sideband.  It is
not uncommon for some agencies to still have the belief that the 'Private
Line' ('PL') setting on their radios will scramble the communications.

>Transcript and they seem to use a combination of rolling code

   *Transcrypt* has a lot of nice systems which they've sold to everyone
from the newsmedia to the National Guard & even some foreign military sales.
I think you referenced their 'Stealth' product, which is a slow, direct-sequence
analog audio system using a variable hop-rate (max of ~50/sec) system.

 
     I disagree with your asserting that most LEA SWAT, narcotics, or other
'high-risk' units use digital voice -- let alone ANY -- voice privacy
systems.  I wish it were the case...



-- 
 Tim Tyler      Internet: tim@ais.org  MCI Mail: 442-5735 
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