Cryptography – Key management – Having particular key generator
Patent
1997-06-27
2000-03-07
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 9, 380 10, 380 20, 380 21, 380 23, 380 25, 380 49, 235380, 34082531, 34082534, 348 6, H04N 7167, H04L 908, H04L 932
Patent
active
060350385
ABSTRACT:
The conditional access system of the present invention allows a service provider to supply services, which may be scrambled by a control word, only to those users who have acquired entitlements to these services. The control word is supplied in Entitlement Control Messages (ECM) after having been encrypted using a key. The entitlements of each user are forwarded in Entitlement Management Messages which contain the key. The conditional access system verifies and validates the ECM and EMM prior to processing the control word.
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Campinos Arnaldo
Fischer Jean-Bernard
Emanuel Peter M.
Gregory Bernarr E.
Shoneman David T.
Thomson Multimedia S.A.
Tripoli Joseph S.
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