Denning's Geo-crypto

[Steve Schear]

At 11:06 AM 11/22/2001 -0800, you wrote:
>Time Magazine, November 26, 2001:
>
>Denning's pioneering a new field she calls geo-encryption.
>Working with industry, Denning has developed a way to keep
>information undecipherable until it reaches its location, as
>determined by GPS satellites. Move studios, for example,
>have been afraid to release films digitally for the same reasons
>record companies hate Napster: once loose on the Internet,
>there's little to stop someone from posting the latest blockbuster
>DVD on the Web for all to see and download. With Denning's
>system, however, only subscribers in specified locations --
>such as movie theaters -- would be able to unscramble the
>data. The technology works as well for national security
>as it does for Harry Potter. Coded messages that the State
>Department sends to its embassies, for example, could only
>be deciphered in the embassy buildings themselves, greatly
>reducing the risk of interception.
>
>For now, Denning says, terrorists "may want to bring down
>the power grid or the finance system, but it's still easier to
>blow up a building." If she's right, it's due in large part to her.

I believe several patents have been filed for something along this line 
(e.g. tamper resistant GPS-smart cards).  Mostly to enable casino to 
satisfy state regulators that their clients are in permitted geographic 
locales.

steve