Smart-card based access control system with improved security
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 22, 1998
Grant Date -
N/A
app pub date -
Jan 30, 1997
filing date -
Aug 4, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
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 smart card for functions such as key generation is reinserted in scrambled form in the high speed output data signal from the smart card. A variable delay device is included in the smart card for controlling when scrambled entitlement data is reinserted into the data stream. Varying the delay permits establishing a desired timing relationship between the reinserted data and other data in the data stream that is output from the smart card. For example, scrambled entitlement data in the output data stream can be made to exhibit substantially the same timing relationship to other data that exists in the input data stream.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully