Perrig A (1997) A copyright protection environment for digital images. Diploma dissertation, EPFL, Lausanne, Switzerland  Home/Search   Document Not in Database   Summary   Related Articles   Check

....trust that D does not abuse this information. If this additional trust in D cannot be established, the scheme does not guarantee any further protection of the work, once a dispute has been resolved. To our knowledge, all watermarking based dispute resolving schemes proposed so far (e.g. [6, 7, 9, 4]) use symmetric watermarking schemes and are disclosing: For D being able to detect the presence of the claimant s watermark in the disputed work, the claimant has to reveal K A i and the watermark WM A i to D . Some schemes even give the original work W i to D . Thus, D may easily produce ....

A. Perrig, A. Herrigel, and J. Ruanaidh, "A copyright protection environment for digital images," in Verlassliche IT-Systeme, GI-Fachtagung VIS '97, DuD Fachbeitrage, pp. 1--16, Vieweg, 1997.

....used in cryptography. There are the brute force attacks which aim at finding secret information through an exhaustive search. Since many watermarking schemes use a secret key it is very important to use keys with a secure length. Another attack in this category is the so called Oracle attack [54,14] which can be used to create a non watermarked image when a watermark detector device is available. 2.4 Protocol attacks The protocol attacks aim at attacking the concept of the watermarking application. The first protocol attack was proposed by Craver et al. [16] They introduce the framework of ....

A. Perrig. A copyright protection environment for digital images. diploma dissertation. Ecole Polytechnique Federal de Lausanne, Lausanne, Switzerland, February, 1997.

....methods must be used in the context of a larger system that may use mechanisms such as timestamping and notarisation to prevent attacks of this kind. Registration mechanisms have not received very much attention in the copyright marking literature to date. The existing references such as [18, 32, 31, 52] mainly focus on protecting the copyright holder and do not fully address the rights of the consumers who might be fooled by a crooked reseller. 3.6 Implementation Considerations The robustness of embedding and retrieving techniques is not the only issue. Most attacks on fielded cryptographic ....

....such a way that anyone with the corresponding public key can read them but not remove them. One problem is that a public decoder can be used by the attacker; he can remove a mark by applying small changes to the image until the decoder cannot find it anymore. This was first suggested by Perrig in [52]. In [42] a more theoretical analysis of this attack is presented as well as a possible countermeasure: randomisating the detection process. One could also make the decoding process computationally expensive. However neither approach is really satisfactory in the absence of tamper resistant ....

Adrian Perrig. A copyright protection environment for digital images. Diploma dissertation, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland, February 1997. 236

....3 protection. Anderson and Petitcolas have shown in [PAK98] ways to attack and break copyright protection schemes for digital images and audio. They have shown various real world problems but they have not taken the failure of a user into account. Many of the attacks have also been described in [Per97, HPR97]. This report takes the entire life cycle of a digital image into account from the artist creator to the end user. We will take a close look at how the user can negatively influence the security of a copyright system and how the software can minimize users mistakes. Further we are analyzing how ....

....or photographs, watermarks are not used. So why should we rely so strongly on watermarks if they are complicated to handle and so easy to defeat This forms the basis of a slightly different approach to copyright protection. A simple approach is based on a model analog to today s copyright office [Per97]. Every user registers the images to copyright at the copyright office. In case of dispute, the court of law can compare the disputed image with 5 It is even possible to download a stand alone watermark detector from the Digimarc web site [Dig97] if you do not have access to Photoshop. Digital ....

Adrian Perrig. A Copyright Protection Environment for Digital Images. Technical report, Ecole Polytechnique F'ed'erale de Lausanne, EPFL - LSE , Switzerland, March 1997.

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Perrig A (1997) A copyright protection environment for digital images. Diploma dissertation, EPFL, Lausanne, Switzerland

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A. Perrig, "A copyright protection environment for digital images," Diploma dissertation, Ecole Polytechnique F ed erale de Lausanne, Switzerland, Feb. 1997.

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Adrian Perrig. A copyright protection environment for digital images. Diploma dissertation,  Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland, February 1997.

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Adrian Perrig. A copyright protection environment for digital images. Diploma dissertation,  Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland, February 1997.

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Adrian Perrig. A copyright protection environment for digital images. Diploma dissertation,  Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland, February 1997.

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A. Perrig, "A copyright protection environment for digital images", Diploma Work, EPFLausanne (Prof. A. Schiper)

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A. Herrigel, A. Perrig, J.J.K. Ó Ruanaidh, "A copyright protection environment for digital images", VIS 97, Verlassliche Informationssysteme, Gesellschaft fuer Informatik, Freiburg, Germany, Sept. 1997.

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Adrian Perrig. A copyright protection environment for digital images. Diploma dissertation, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland, February 1997.

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