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- Newsgroups: sci.crypt
- Path: sparky!uunet!spool.mu.edu!think.com!ames!network.ucsd.edu!qualcom.qualcomm.com!servo.qualcomm.com!karn
- From: karn@servo.qualcomm.com (Phil Karn)
- Subject: Re: Motorola 'Secure-Clear' Cordless Telephones
- Message-ID: <1993Jan3.110338.25314@qualcomm.com>
- Sender: news@qualcomm.com
- Nntp-Posting-Host: servo.qualcomm.com
- Organization: Qualcomm, Inc
- References: <1993Jan2.174522.12032@qiclab.scn.rain.com> <1993Jan2.234049.27767@qualcomm.com> <1993Jan3.054517.29505@colnet.cmhnet.org>
- Distribution: na
- Date: Sun, 3 Jan 1993 11:03:38 GMT
- Lines: 15
-
- In article <1993Jan3.054517.29505@colnet.cmhnet.org> res@colnet.cmhnet.org (Rob Stampfli) writes:
- >>Another is that Bell Labs developed a truly remarkable (given the
- >>technology of the day) secure speech system that really was secure. It
- >How did they keep them in sync?
-
- Good question. I seem to remember that this was a problem. The system
- was written up in IEEE Spectrum some years ago, but I don't have a
- copy on hand.
-
- I believe it was the same issue that explained how Hedy Lamarr (yes,
- the movie actress) invented frequency hopping, one of the fundamental
- forms of spread spectrum radio.
-
- Phil
-
-