Method and system for digital information protection
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United States of America Patent
Stats
-
Dec 23, 1997
Grant Date -
N/A
app pub date -
Nov 29, 1995
filing date -
Dec 1, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital information protection scheme using an improved security protocol. In a system in which a user makes an access to a digital information provided by an information center by connecting a computer card owned by the user to an information terminal device connected with the information center, a work key for encrypting a desired digital information is delivered from the information center to the computer card through the information terminal device, and the work key is registered in the computer card; the desired digital information encrypted by the work key is delivered from the information center to the information terminal device; and an encrypted digital information delivered from the information center is decrypted at the information terminal device by using the work key registered in the computer card, and a decrypted digital information is provided to the user at the information terminal device.
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