Source: http://www.google.com/patents/US5852290?dq=3958081
Timestamp: 2018-01-18 22:23:01
Document Index: 488896584

Matched Legal Cases: ['art 1', 'art 2', 'art 3', 'art 1', 'art 2', 'art 3']

Patent US5852290 - Smart-card based access control system with improved security - Google Patents
A smart card that includes a descrambler for descrambling entitlement information and data provides improved access control by controlling the manner in which the entitlement information portion of the data stream is passed through the smart card. Entitlement data that is descrambled and used in the...http://www.google.com/patents/US5852290?utm_source=gb-gplus-sharePatent US5852290 - Smart-card based access control system with improved security
Publication number US5852290 A
Application number US 08/776,555
PCT number PCT/US1995/009953
Publication number 08776555, 776555, PCT/1995/9953, PCT/US/1995/009953, PCT/US/1995/09953, PCT/US/95/009953, PCT/US/95/09953, PCT/US1995/009953, PCT/US1995/09953, PCT/US1995009953, PCT/US199509953, PCT/US95/009953, PCT/US95/09953, PCT/US95009953, PCT/US9509953, US 5852290 A, US 5852290A, US-A-5852290, US5852290 A, US5852290A
Patent Citations (44), Non-Patent Citations (12), Referenced by (152), Classifications (23), Legal Events (5)
Smart-card based access control system with improved security
US 5852290 A
a first terminal for receiving an input signal including first and second scrambled signal components;
a second terminal for providing an output signal;
means for processing said first scrambled signal component for producing a first descrambled processed signal, and being responsive to said first descrambled processed signal for processing said second scrambled signal component for producing a second descrambled processed signal; and
means for combining said first scrambled signal component of said input signal and said second descrambled processed signal to produce said output signal.
2. The smart card of claim 1 wherein
said means for combining said first scrambled signal component of said input signal and said second descrambled processed signal producing a predetermined timing relationship between said first scrambled signal component and said second descrambled processed signal in said output signal.
3. The smart card of claim 2 wherein
said means for combining said first scrambled signal component of said input signal and said second descrambled processed signal comprising:
means for delaying said first scrambled signal component to produce a delayed signal exhibiting substantially said predetermined timing relationship with respect to said second descrambled processed signal; and
means for combining said delayed signal and said second descrambled processed signal to produce said output signal.
4. The smart card of claim 3 wherein
said input signal exhibiting an input timing relationship between said first scrambled signal component and said scrambled second signal component; and
said predetermined timing relationship being substantially the same as said input timing relationship.
5. The smart card of claim 4 wherein said means for delaying said first scrambled signal component of said input signal comprises a first-in-first-out memory device.
7. The smart card of claim 6 wherein
said means for producing said first and second descrambled signals, said means for producing said control information and said means for combining said first scrambled signal component and said second descrambled signal to produce said output signal being included in an IC mounted in said smart card; and
said first and second terminals being positioned on a surface of said smart card.
8. The smart card of claim 7 further comprising a third terminal positioned on said surface of said smart card for receiving a timing signal;
said means for producing said first and second descrambled signals being responsive to said timing signal for processing said input signal at a first data rate to produce said output signal at said first data rate.
9. The smart card of claim 8 wherein said first data rate exceeds 10 mega-Hertz.
15. The smart card of claim 4 wherein
said first scrambled signal component comprises entitlement management information for a pay-for-access service; and
said second scrambled signal component comprises data provided by said pay-for-access service.
16. The smart card of claim 15 wherein said pay-for-access service comprises a pay-TV service; said entitlement management information comprises television programming entitlement information; and said data provided by said pay-for-access-service comprises television program data.
18. Signal processing apparatus comprising:
(a) a signal processing channel for processing a digital input signal having a first scrambled signal component and a second scrambled signal component;
(b) means for coupling said input signal to a removable smart card assembly, said smart card assembly processing said first scrambled signal component for producing a first descrambled signal internal to said card assembly, said smart card assembly processing, in response to said first descrambled signal, said second scrambled signal component for producing a second descrambled signal and said smart card assembly combining said first scrambled signal component of said input signal and said second descrambled signal component to produce an output signal;
(c) means for receiving from said smart card assembly said output signal; and
(d) means for processing said second descrambled signal component to generate a signal suitable for display.
19. A method for signal processing, said method comprising:
(a) receiving a digital input signal having a first scrambled signal component and a second scrambled signal component;
(b) coupling said input signal to a removable smart card assembly for processing said first scrambled signal component to produce a first descrambled signal internal to said smart card assembly, and for processing, in response to said first descrambled signal, said second scrambled signal component for producing a second descrambled signal and for combining said first scrambled signal component of said input signal and said second descrambled signal component to produce an output signal;
(c) receiving from said smart card assembly said output signal; and
(d) processing said second descrambled signal component to generate a signal suitable for display.
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U.S. Classification 235/492, 902/26, 902/2, 348/E07.061, 235/380, 348/E07.056
International Classification H04N7/167, H04N7/16, G07F7/10
Cooperative Classification G07F7/1008, H04N21/4181, G06Q20/346, G06Q20/40975, H04N21/4623, H04N7/163, G06Q20/341, H04N7/1675
European Classification G06Q20/341, G06Q20/346, G06Q20/40975, H04N7/167D, H04N7/16E2, G07F7/10D
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHANEY, JOHN WILLIAM;REEL/FRAME:008658/0080