Crypt key system

Details Crypt key system Crypt key system

1995-12-13

1998-04-14

Barron, Jr., Gilberto

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 20, 380 30, H04N 7167, H04L 930

Patent

active

057402469

ABSTRACT:
The present invention provides a concrete structure for applying a crypt key system to a television system, a database system or an electronic commercial transaction system or the like. This system consists of a broadcasting station, a database, a receiving apparatus, a data communication apparatus and a user terminal. As a crypt key system, a secret-key cryptosystem, a public-key cryptosystem, and a digital signature system are used. The keys used in the system are either encrypted or remain uncrypted to be supplied by broadcasting. The present invention is effective in preventing an unjustified use of the database system, managing copyrights, and in a pay-per-view system and a video-on-demand system. Further, the present invention is effective in realizing an electronic market which uses an electronic data information system.

REFERENCES:
patent: 5142579 (1992-08-01), Anderson
patent: 5400403 (1995-03-01), Fahn et al.
patent: 5442706 (1995-08-01), Kung
patent: 5504933 (1996-04-01), Saito
Vigarie, JeaPierre "A device for real-time modification of access conditions in D2-MAC/ Pakedt EUROCRYPT signal: The Transcontroller," 18th International Television Symposium and Technical Exhibition, Montreux, Switzerland, Jun. 10-15, 1993, pp. 761-768.

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