Patent
Layered security in digital watermarking
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TLDR
In this paper, a media object authentication system using layers of security features based on digital watermarks embedded in media objects is presented. But the system does not consider the data about the media object.Abstract:
A media object authentication system uses layers of security features based on digital watermarks embedded in media objects. The system generates a first digital watermark with a message payload carrying data about the object, such as a hash of text data printed on the object. The first digital watermark is combined with a content signature derived from features of the media object, such as frequency domain attributes, edge attributes, or other filtered version of the media signal (e.g., image photo on a secure document) on the media object. This combination forms a new digital watermark signal that is embedded in the host media object. To verify the object, the digital watermark payload is extracted and compared with the data about the object. The combined digital watermark and content signature is also evaluated to authenticate the media signal on the media object.read more
Citations
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References
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Patent
Method and apparatus for embedding authentication information within digital data
TL;DR: Arbitrary digital information is embedded within a stream of digital data, in a way that avoids detection by a casual observer and that allows a user to determine whether the digital data have been modified from their intended form.
Patent
Watermark embedder and reader
TL;DR: A watermark system includes an embedder, detector, and reader as mentioned in this paper, which can be applied to mark graphical models, blank paper, film and other substrates, texturing objects for ID purposes, etc.
Patent
Computer system linked by using information in data objects
TL;DR: In this paper, various improvements to steganographic systems, and applications, are disclosed, such as facilitating scale and rotation registration, improving robustness, and representing data by patterned bit cells whose energy in the spatial domain facilitates decoding registration.
Proceedings ArticleDOI
A robust content based digital signature for image authentication
Marc Schneider,Shih-Fu Chang +1 more
TL;DR: The idea of signature based authentication is extended to video, and a system to generate signatures for video sequences is presented, which allows smaller segments of the secured video to be verified as unmanipulated.
Patent
Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
TL;DR: In this article, the authors present methods and systems for encoding digital watermarks into content signals, including window identifier for identifying a sample window in the signal; an interval calculator for determining a quantization interval of the sample window; and a sampler for normalizing sample window to provide normalized samples.