Cryptography – Key management – Key escrow or recovery
Reexamination Certificate
2007-05-29
2007-05-29
Barron, Gilberto (Department: 2135)
Cryptography
Key management
Key escrow or recovery
C713S181000, C713S180000
Reexamination Certificate
active
09961835
ABSTRACT:
A method and apparatus for managing access to a signal representative of an event of a service provider, including receiving said signal in a smart card, said signal being scrambled using a scrambling key, receiving, in said smart card, data representative of a first share; constructing said scrambling key using said first share and at least one additional share, said additional share being stored in said smart card; and descrambling said signal using said constructed scrambling key to provide a descrambled signal, wherein the step of constructing said scrambling key comprises calculating the Y-intercept of the line formed on said Euclidean plane by said first, and said at least one additional share.
REFERENCES:
patent: 4797672 (1989-01-01), Kousa
patent: 5675649 (1997-10-01), Brennan et al.
patent: 5724425 (1998-03-01), Chang et al.
patent: 5764767 (1998-06-01), Beimel et al.
patent: 5825880 (1998-10-01), Sudia et al.
patent: 5901229 (1999-05-01), Fujisaki et al.
patent: 5937066 (1999-08-01), Gennaro et al.
patent: 5978475 (1999-11-01), Schneier et al.
patent: 5991414 (1999-11-01), Garay et al.
patent: 6088454 (2000-07-01), Nagashima et al.
patent: 6182214 (2001-01-01), Hardjono
patent: 6192472 (2001-02-01), Garay et al.
patent: 6209091 (2001-03-01), Sudia et al.
patent: 6490680 (2002-12-01), Scheidt et al.
patent: WO 00 49756 (2000-09-01), None
Shamir, How to Share a Secret, ACM, vol. 22, pp. 612-613.
Simmons, J.D.: “Prepositioned Shared Secret and/or Shared Control Schemes”, Eurocrypt '89 Proceedings, Springer-Verlag, ′Online! 1990, p. 437-467, XP002201103.
Menzeles, Oorschot: “Handbook of Applied Cryptography” 1997, CRC Press LLC, USA XP002201106, p. 364, p. 524-527.
Blundo, Cresti, De Santis, Vaccaro: “Fully Dynamic Secret Sharing Schemes” Dipartamento di Informatica ed Applicazioni, ′Online! 1994, p. 110-125, XP002201105, Universita di Salemo, Abstract, Chapter 1 and 6.
Barron Gilberto
Kiel Paul P.
Klimach Paula
Laks Joseph J.
Shedd Robert D.
LandOfFree
Threshold cryptography scheme for conditional access systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Threshold cryptography scheme for conditional access systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Threshold cryptography scheme for conditional access systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3758697