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Flatbed scanner identification based on dust and scratches over scanner platen
Acoustics, Speech, and Signal Processing, IEEE International Conference on
By Ahmet Emir Dirik, Husrev Taha Sencar, Nasir Memon
Issue Date:April 2009
In this paper, a novel individual source scanner identification scheme is proposed. The scheme uses traces of dust, dirt, and scratches over scanner platen on scanned images to characterize a source scanner. The efficacy of the proposed scheme is substanti...
An Ensemble of Classifiers Approach to Steganalysis
Pattern Recognition, International Conference on
By Sevinc Bayram, Ahmet Emir Dirik, Husrev Taha Sencar, Nasir Memon
Issue Date:August 2010
Most work on steganalysis, except a few exceptions, have primarily focused on providing features with high discrimination power without giving due consideration to issues concerning practical deployment of steganalysis methods. In this work, we focus on ma...
Modeling user choice in the PassPoints graphical password scheme
Found in: Proceedings of the 3rd symposium on Usable privacy and security (SOUPS '07)
By Ahmet Emir Dirik, Jean-Camille Birget, Nasir Memon
Issue Date:July 2007
We develop a model to identify the most likely regions for users to click in order to create graphical passwords in the PassPoints system. A PassPoints password is a sequence of points, chosen by a user in an image that is displayed on the screen. Our mode...
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