Cryptography – Key management – Having particular key generator
Patent
1995-02-23
1997-08-19
Black, Thomas G.
Cryptography
Key management
Having particular key generator
380 4, 380 49, 380 54, G06F 1730
Patent
active
056597266
ABSTRACT:
A method of embedding auxiliary information into a set of host data, such as a photograph, television signal, facsimile transmission, or identification card. All such host data contain intrinsic noise, allowing pixels in the host data which are nearly identical and which have values differing by less than the noise value to be manipulated and replaced with auxiliary data. As the embedding method does not change the elemental values of the host data, the auxiliary data do not noticeably affect the appearance or interpretation of the host data. By a substantially reverse process, the embedded auxiliary data can be retrieved easily by an authorized user.
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Handel Theodore G.
Sandford, II Maxwell T.
Black Thomas G.
Eklund William A.
Lintz Paul R.
Wyrick Milton D.
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