05646997 is referenced by 605 patents and cites 1 patents.

Arbitrary digital information is embedded within a stream of digital data, in a way that avoids detection by a casual observer and that allows a user to determine whether the digital data have been modified from their intended form. The embedded information may only be extracted as authorized and may be used to verify that the original digital data stream has not been modified.

Title
Method and apparatus for embedding authentication information within digital data
Application Number
8/357713
Publication Number
5646997
Application Date
December 14, 1994
Publication Date
July 8, 1997
Inventor
James M Barton
101 Sund Ave., Los Gatos, 95032
CA, US
Agent
Michael A Glenn
IPC
H04L 9/00
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