Re: Motorola 'Secure-Clear' Cordless Telephones

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Article #2649

#2649

From: Rob Stampfli
Date: Sun, 03 Jan 1993 05:45

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>Another is that Bell Labs developed a truly remarkable (given the
>technology of the day) secure speech system that really was secure. It
>used voice coders (vocoders) and one-time-pads generated by recording
>the electrical noise from mercury-vapor rectifier tubes on phonograph
>records.  After two pressings were made, the masters were destroyed.
>One copy was kept in the US and the other was shipped to London under
>the careful watch of a Marine guard. After being used once to protect
>a Roosevelt-Churchill conversation, each pair of discs was destroyed.

How did they keep them in sync?
-- 
Rob Stampfli  rob@colnet.cmhnet.org      The neat thing about standards:
614-864-9377  HAM RADIO: kd8wk@n8jyv.oh  There are so many to choose from.

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Message-ID: <1993Jan3.054517.29505@colnet.cmhnet.org>

Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!n8emr!colnet!res

References: <C05JAM.MJL@ais.org> <1993Jan2.174522.12032@qiclab.scn.rain.com> <1993Jan2.234049.27767@qualcomm.com>

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Newsgroups: sci.crypt
Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!n8emr!colnet!res
From: res@colnet.cmhnet.org (Rob Stampfli)
Subject: Re: Motorola 'Secure-Clear' Cordless Telephones
Message-ID: <1993Jan3.054517.29505@colnet.cmhnet.org>
Organization: Little to None
References: <C05JAM.MJL@ais.org> <1993Jan2.174522.12032@qiclab.scn.rain.com> <1993Jan2.234049.27767@qualcomm.com>
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Date: Sun, 3 Jan 1993 05:45:17 GMT
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