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- Andrew D. Ker
- IEEE Signal Processing Letters
- 2005
We consider the problem of detecting spatial domain least significant bit (LSB) matching steganography in grayscale images, which has proved much harder than for its counterpart, LSB replacement. We… (More)
- Andrew D. Ker, Rainer Böhme
- Security, Forensics, Steganography, and…
- 2008
This paper revisits the steganalysis method involving a Weighted Stego-Image (WS) for estimating LSB replacement payload sizes in digital images. It suggests new WS estimators, upgrading the method’s… (More)
- Andrew D. Ker
- Information Hiding
- 2004
We consider methods for answering reliably the question of whether an image contains hidden data; the focus is on grayscale bitmap images and simple LSB steganography. Using a distributed computation… (More)
- Andrew D. Ker
- IEEE Transactions on Information Forensics and…
- 2007
This paper proposes steganalysis methods for extensions of least-significant bit (LSB) overwriting to both of the two lowest bit planes in digital images: there are two distinct embedding paradigms.… (More)
- Tomás Pevný, Jessica J. Fridrich, Andrew D. Ker
- IEEE Transactions on Information Forensics and…
- 2009
A quantitative steganalyzer is an estimator of the number of embedding changes introduced by a specific embedding operation. Since for most algorithms the number of embedding changes correlates with… (More)
- Rainer Böhme, Andrew D. Ker
- Security, Steganography, and Watermarking of…
- 2006
Quantitative steganalysis refers to the exercise not only of detecting the presence of hidden stego messages in carrier objects, but also of estimating the secret message length. This problem is well… (More)
- Andrew D. Ker, Tomás Pevný, Jan Kodovský, Jessica J. Fridrich
- MM&Sec
- 2008
There are a number of recent information theoretic results demonstrating (under certain conditions) a sublinear relationship between the number of cover objects and their total steganographic… (More)
- Andrew D. Ker
- Information Hiding
- 2006
Conventional steganalysis aims to separate cover objects from stego objects, working on each object individually. In this paper we investigate some methods for pooling steganalysis evidence, so as to… (More)
- Andrew D. Ker
- MM&Sec
- 2008
The literature now contains a number of highly-sensitive detectors for LSB replacement steganography in digital images. They can also estimate the size of the embedded payload, but cannot locate it.… (More)
- Andrew D. Ker
- Information Hiding
- 2007
This paper draws together two methodologies for the detection of bit replacement steganography: the principle of maximum likelihood, which is statistically well-founded but has lead to weak detectors… (More)