Cryptography – Key management – Having particular key generator
Patent
1995-01-18
1996-12-31
Tarcza, Thomas H.
Cryptography
Key management
Having particular key generator
380 20, H04L 900
Patent
active
055902022
ABSTRACT:
A digital conditional access module for a subscriber terminal comprises a decryption device including at least one PID register and an associated countdown register. The decryption device is enabled for decrypting received product packets having a PID matching a PID stored in the PID register so long as the associated countdown register is characterized by a non-zero value. Decryption of a product packet results in the countdown register being decremented by a selected factor, the countdown register being prevented from assuming a zero value by setting its contents to a selected value in response to a received conditional access packet containing a PID matching the PID stored in the PID register. The selected value to which the countdown register is set may also be contained within the received conditional access packet.
REFERENCES:
patent: 4348696 (1982-09-01), Beier
patent: 4736422 (1988-04-01), Mason
patent: 4740890 (1988-04-01), William
patent: 4916737 (1990-04-01), Chomet et al.
patent: 5272752 (1993-12-01), Myers et al.
patent: 5400402 (1995-03-01), Garfinkle
patent: 5420866 (1995-05-01), Wasilewski
patent: 5465113 (1995-11-01), Gilboy
patent: 5473688 (1995-12-01), Wiedemer
Bestler Caitlin B.
Hartley, III Harry A.
Rabii Khosro M.
Laufer Pinchus M.
Tarcza Thomas H.
Zenith Electronics Corporation
LandOfFree
Countdown system for conditional access module does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Countdown system for conditional access module, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Countdown system for conditional access module will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1148010