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- Newsgroups: sci.crypt
- Path: 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>
- Distribution: na
- Date: Sun, 3 Jan 1993 05:45:17 GMT
- Lines: 13
-
- >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.
-