Cryptography – Cryptanalysis
Patent
1996-08-02
1999-10-19
Dombroske, George
Cryptography
Cryptanalysis
380 10, 380 54, H04N 7167
Patent
active
059701404
ABSTRACT:
A method of embedding auxiliary information into the digital representation of host data containing noise in the low-order bits. The method applies to digital data representing analog signals, for example digital images. The method reduces the error introduced by other methods that replace the low-order bits with auxiliary information. By a substantially reverse process, the embedded auxiliary data can be retrieved easily by an authorized user through use of a digital key. The modular error embedding method includes a process to permute the order in which the host data values are processed. The method doubles the amount of auxiliary information that can be added to host data values, in comparison with bit-replacement methods for high bit-rate coding. The invention preserves human perception of the meaning and content of the host data, permitting the addition of auxiliary data in the amount of 50% or greater of the original host data.
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Ettinger J. Mark
Handel Theodore G.
Sandford, II Maxwell T.
Amrozowicz Paul D.
Dombroske George
The Regents of the University of California
Wyrick Milton D.
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