I presume the paper in question is 
http://www.cs.georgetown.edu/~denning/infosec/Grounding.txt

Ian BROWN writes:
 > Dorothy Denning wrote an interesting paper on authenticating location using 
 > GPS signals... I think it's reachable from her home page as well as the 
 > following citation:
 > 
 > D. E. Denning and P. F. MacDoran, "Location-Based Authentication: Grounding 
 > Cyberspace for Better Security," Computer Fraud and Security, Feb. 1996
 > 
 > Ian :)
 > 

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