Conditional access system using messages with multiple encryptio

Details Conditional access system using messages with multiple encryptio Conditional access system using messages with multiple encryptio

1997-07-28

2000-07-18

Swann, Tod R.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, H04K 100

Patent

active

060918187

ABSTRACT:
The invention relates to a conditional access system making it possible for a service provider to supply his services solely to users having acquired entitlements to these services.
The services supplied by a service provider consist of an item scrambled by control words. To keep these control words secret, they are supplied in messages (MEC) after having been encrypted with an encryption algorithm with key K.
According to the invention, one and the same message (MEC) contains the same control word (Cwi) encrypted several times, each encryption (E(Cwi)Kj) of the control word depending on a different encryption key (Kj).
The invention applies to any type of conditional access system, be this system either of "off-line" or "on-line" type.

REFERENCES:
patent: 5191611 (1993-03-01), Lang
patent: 5703951 (1997-12-01), Dolphin
patent: 5721781 (1998-02-01), Deo
European Search Report.

Affiliated with

Also associated with

Rating

Conditional access system using messages with multiple encryptio does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Conditional access system using messages with multiple encryptio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Conditional access system using messages with multiple encryptio will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2045305