Real-time screen watermarking using overlaying layer

M. Piec, A. Rauber:
"Real-time screen watermarking using overlaying layer";
Vortrag: International Workshop on Digital Forensics (WSDF), Fribourg, Switzerland; 08.09.2014 - 12.09.2014; in:"International Workshop on Digital Forensics", (2014).

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Abstract:


Protection of intellectual property is a well re-
searched area of computer science. There are many methods
that allow securing information that should not be available
to unauthorized parties. Many of these techniques provide
protection on a relatively low level such as file encryption or
filtering of network traffic. However, many of the mechanisms
fail as soon as someone attempts to save the content of the screen
that is displaying the sensitive data. Such a malicious insider can
cause serious harm to an organization┬┤s reputation and finances.
It is important in case of such incidents to be able to track the
source of the leak.
In this paper a method for watermarking the screen image,
that can be used in forensic investigations, is presented. The
imperceptible digital watermark is placed on the overlay layer
over the whole computer screen. Our method leverages the
Human Visual System (HVS) properties and allows to generate
dynamically adaptable watermarks that respond to the currently
displayed content by using the FAST feature detection algorithm.
We use QR Codes that provide spatial non-uniformity and
error correction capabilities. The evaluation shows that our
scheme works well in the selected use-case scenarios. We show
that the watermark is robust against modifications typical for
office processing, such as cropping and quality preserving JPEG
compression.