Apparatus and method for access control

Details Apparatus and method for access control Apparatus and method for access control

1993-09-14

1995-10-24

Barron, Jr., Gilberto

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 16, 235380, H04L 932, H04L 7167

Patent

active

054616751

ABSTRACT:
In a system for controlling access to signals such as pay-TV signals, the signals include data packets that are received and by a decoder and forwarded to a smart card for access authorization processing. The data packets contain information that updates entitlement or access authorization data inside the smart card. Time-related data is added to the data packets. The smart card checks to determine if the time-related data evolves between two successive packets. If not, the smart card inhibits the delivering of descrambling parameters to the decoder.

REFERENCES:
patent: 4944008 (1990-07-01), Piosenka et al.
patent: 5056140 (1991-10-01), Kimbell
patent: 5208856 (1993-05-01), Leduc et al.

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