If you are really worried about GPS spoofing, cross-check using independent time
sources, including dialup time (NIST, USNO, PTB, IEN, ...), shortwave radio time
(WWVB, CHU, DCF77, LORAN-C, ...), or your own atomic clocks.
See http://www.ntp.org for more information.
-- Rex
At 12:41 PM -0400 10/11/00, Paul D. Robertson wrote:
>On Wed, 11 Oct 2000, Ng, Kenneth (US) wrote:
>> Note: GPS opens you up to a remote attack if someone has equipment to spoof
>> the signals. The CA signal format is public knowledge. The real signal is
>> already buried in the background noise.
>
>Yep, but that's fairly easy to rectify by placing multiple stratum-1's
>around and then comparing the results. If someone's going to spoof GPS at
>multiple physical locations, you're going to have larger problems than
>time sync. You can also sheild the antenna to limit the signal to a
>fairly small look angle. It's also not that hard to set up a reciever to
>do a signal strength analysis...
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