Linear and nonlinear oblivious data hiding

Authors:
Litao Gang;Ali N. Akansu;Mahalingam Ramkumar
Affiliations:
InfoDesk, Inc., Tarrytown, NY;Department of Electrical and Computer Engineering (ECE), New Jersey Institute of Technology, University Heights, Newark, NJ;Department of Computer Science and Engineering, Mississippi State University, MS
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2004

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Abstract

The majority of the existing data hiding schemes are based on the direct-sequence (DS) modulation where a low-power random sequence is embedded into the original cover signal to represent hidden information. In this paper, we investigate linear and non-linear modulation approaches in digital data hiding. One typical DS modulation algorithm is explored and its optimal oblivious detector is derived. The results expose its poor cover noise suppression as the hiding signature signal always has much lower energy than the cover signal. A simple nonlinear algorithm, called set partitioning, is proposed and its performance is analyzed. Analysis and simulation studies further demonstrate improvements over the existing schemes.