Cryptography – Cryptanalysis
Patent
1995-04-28
1997-06-17
Cain, David C.
Cryptography
Cryptanalysis
380 20, H04N 7167
Patent
active
056404522
ABSTRACT:
A system for assuring the location integrity of a decryption chip used to receive and decrypt encrypted signals ES received from an encrypted signal source. The decryption chip operates in association with a licensed signal receiver and is licensed for use at a selected site or location L.sub.i and is positioned adjacent to a Satellite Positioning System (SATPS) antenna and receiver/processor that determine the present location L of this antenna. If the SATPS-determined location L is within a region R(L.sub.i ;d.sub.i), centered at the location L.sub.i and having a selected diameter d.sub.i, and if the signal ES is associated with a channel that is authorized for reception by this signal receiver, the deception chip is enabled, and the signal ES is decrypted for audible or visual display on the signal receiver. Otherwise, the decryption chip does not decrypt the incoming signal ES. The licensed site location L.sub.i can be changed and the group of channels for which signal receipt and decryption is authorized can be changed. This system can operate on encrypted television signals and other similar signals. The SATPS may be a Global Positioning System (GPS) or a Global Orbiting Navigational Satellite System (GLONASS), or another suitable satellite-based location determination system.
REFERENCES:
patent: 4102521 (1978-07-01), Hermann
patent: 4117271 (1978-09-01), Teeter et al.
patent: 4205343 (1980-05-01), Barrett
patent: 4222067 (1980-09-01), Stern et al.
patent: 4286288 (1981-08-01), Waldo
patent: 4709266 (1987-11-01), Hanas et al.
patent: 4710955 (1987-12-01), Kauffman
patent: 4712239 (1987-12-01), Frezza et al.
patent: 4739510 (1988-04-01), Jeffers et al.
patent: 4823386 (1989-04-01), Dumbauld et al.
patent: 4887296 (1989-12-01), Horne
patent: 4912760 (1990-03-01), West et al.
patent: 4916737 (1990-04-01), Chomet et al.
patent: 4932057 (1990-06-01), Kolbert
patent: 4947428 (1990-08-01), Guillou et al.
patent: 4972431 (1990-11-01), Keegan
patent: 4993067 (1991-02-01), Leopold
patent: 5014309 (1991-05-01), West
patent: 5036537 (1991-07-01), Jeffers et al.
patent: 5349459 (1994-09-01), Reed
patent: 5363448 (1994-11-01), Koopman et al.
patent: 5382957 (1995-01-01), Blume
Cain David C.
Schipper John
Trimble Navigation Limited
LandOfFree
Location-sensitive decryption of an encrypted message does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Location-sensitive decryption of an encrypted message, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Location-sensitive decryption of an encrypted message will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2163952