Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!genrad!teddy!panda!talcott!harvard!seismo!brl-tgr!ron 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.