Method and apparatus for encrypting and decrypting data using encrypting key contained in electronic watermark
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United States of America Patent
Stats
-
Dec 5, 2006
Issued Date -
N/A
app pub date -
Jan 24, 2002
filing date -
Feb 2, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In encoder side, an electronic watermark generating device generates an electronic watermark which contains a encryption key. An electronic watermark inserting device inserts the electronic watermark containing the encryption key into a first portion of data. An encrypting device encrypts a second portion of the data with the encryption key. The first portion into which the watermark containing the encryption key has been inserted and the second portion which has been encrypted with the encryption key are combined by a switch and thereafter recorded on a record medium or transmitted to a network. In decoder side, the watermark containing the encryption key is extracted from the first portion and the encryption key is extracted from the watermark. The second portion is decrypted with the extracted encryption key.
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