Optimally weighted least-squares steganalysis

Andrew D. Ker

doi:10.1117/12.704606

2 March 2007 Optimally weighted least-squares steganalysis

Andrew D. Ker

Proceedings Volume 6505, Security, Steganography, and Watermarking of Multimedia Contents IX; 650506 (2007) https://doi.org/10.1117/12.704606
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States

Abstract

Quantitative steganalysis aims to estimate the amount of payload in a stego object, and such estimators seem to arise naturally in steganalysis of Least Significant Bit (LSB) replacement in digital images. However, as with all steganalysis, the estimators are subject to errors, and their magnitude seems heavily dependent on properties of the cover. In very recent work we have given the first derivation of estimation error, for a certain method of steganalysis (the Least-Squares variant of Sample Pairs Analysis) of LSB replacement steganography in digital images. In this paper we make use of our theoretical results to find an improved estimator and detector. We also extend the theoretical analysis to another (more accurate) steganalysis estimator (Triples Analysis) and hence derive an improved version of that estimator too. Experimental results show that the new steganalyzers have improved accuracy, particularly in the difficult case of never-compressed covers.

Citation Download Citation

Andrew D. Ker "Optimally weighted least-squares steganalysis", Proc. SPIE 6505, Security, Steganography, and Watermarking of Multimedia Contents IX, 650506 (2 March 2007); https://doi.org/10.1117/12.704606

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