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From: ron@brl-tgr.ARPA (Ron Natalie )
Newsgroups: net.dcom
Subject: Re: Analog time-segment voice scramblers-- How secure?
Message-ID: <7493@brl-tgr.ARPA>
Date: Thu, 17-Jan-85 19:57:07 EST
Article-I.D.: brl-tgr.7493
Posted: Thu Jan 17 19:57:07 1985
Date-Received: Sun, 20-Jan-85 05:10:22 EST
References: <649@ucbtopaz.CC.Berkeley.ARPA>
Organization: Ballistic Research Lab
Lines: 10


The answer is not very.  Some language and hearing researchers did some
research into this and you have to do a lot of scrambling over a large
time period to make it stop sounding like speech.  Instead of shifting
in the time domain as you are suggesting, why not (since your attack
is to convert to digital anyway) encrypt the values?

-Ron

I'll try to find my reference material on this subject.