J. Fridrich, "Methods for tamper detection in digital images," Proc. ACM Workshop on Multimedia and Security, pp. 19--23, Orlando, FL, October 30--31, 1999.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....declare the photo authentic if only these are present. Finally the special marlrings should be inserted so that no other agent can create a successful forgery. Researchers have proposed approaches to this class of problems based on digital watermarldng cryptography and content classification [1] [8] Ultimately the methods developed to date attempt to balance the competing goals of robustness to benign degradation security against tampering attacks and embedding distortion. For example previous work suggests that reducing the embedding distortion or increasing the security to forgery ....

J. Fridrich, "Methods for tamper detection in digital images," Proceedings of Multimedia and Security Workshop at A CM Multimedia, 1999.

....still declare the photo authentic if only these are present. Finally the special markings should be inserted so that no other agent can create a successful forgery. Researchers have proposed approaches to this class of problems based on digital watermarking cryptography and content classification [1] [8] Ultimately the methods developed to date attempt to balance the competing goals of robustness to benign degradation security against tampering attacks and embedding distortion. For example previous work suggests that reducing the embedding distortion or increasing the security to forgery ....

J. Fridrich, "Methods for tamper detection in digital images," Proceedings of Multimedia and Security Workshop at ACM Multimedia, 1999.

....Systems of this type can be used to facilitate authenticating scientific data, photographic images, and voice recordings in forensic and other contexts. Researchers have proposed a variety of approaches to such problems based on digital water marking, cryptography, and content classification [2] [3] 4] 5] 6] 7] 8] 9] 10] 11] 12] 13] 14] 15] 16] 17] Ultimately, the methods developed to date implicitly or explicitly attempt to balance the competing goals of robustness to benign perturbations, security against tampering attacks, and encoding distortion. Some researchers [6] ....

J. Fridrich, "Methods for tamper detection in digital images," Proc. Multimedia and Security Workshop at A CM Multimedia, 1999.

....medical persons whether the document is the same as the original one, but also if some differences exist, their location and importance. The decision could then be taken to consider the documentas valuable or not. Watermarking as a tool for integrity control is well adapted for this purpose [18] [19]. As the checking of complex watermark maybe heavy, it is probably not likely that it is done every time the image is displayed. The resume file attached to the image or the image header will be the prime identifier, and the control of the adequacy between the image and the resume or header be ....

J. Fridrich, "Methods for Tamper Detection in Digital Images," in Proceedings of the Multimedia and Security Workshop at ACM Multimedia'99,ACM, Ed., Orlando, Florida, USA, Oct. 1999, pp. 29--33.

....declare the photo authentic if only these are present. Finally the special markings should be inserted so that no other agent can create a successful forgery. Researchers have proposed approaches to this class of problems based on digital watermarking, cryptography, and content classi cation [1] [8] Ultimately, the methods developed to date attempt to balance the competing goals of robustness to benign degradation, security against tampering attacks, and embedding distortion. For example, previous work suggests that reducing the embedding distortion or increasing the security to forgery ....

J. Fridrich, \Methods for tamper detection in digital images," Proceedings of Multimedia and Security Workshop at ACM Multimedia , 1999.

....in either the public or secret key setting. The watermark is designed to be fragile so that signi cant modi cations of a valid signal will destroy the watermark and prevent the modi ed signal from being declared authentic. Other researchers have focused on content based methods [7] 8] [9]. The idea behind these techniques is to extract a concise representation of the signal. The concise representation is then protected using digital signature techniques from conventional cryptography and then embedded back in the signal via digital watermarking. Methods of extracting concise ....

Jiri Fridrich. Methods for tamper detection in digital images. Proceedings of Multimedia and Security Workshop at ACM Multimedia, 1999.

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J. Fridrich, "Methods for Tamper Detection in Digital Images", Proc. ACM Multimedia 1999, Workshop on Multimedia and Security, October 30 - November 5, 1999

....with a digital camera or digital video camera would be watermarked on the fly so that later we can prove image integrity or indicate blocks in the image that have been tampered with. For a comprehensive review of watermarking techniques for tamper detection and common security problems, see [4]. Again, in this particular application, using one pattern that does not depend on the image would be insecure because analyzing a relatively small number of images ma reveal the watermark pattern [3] What is needed in both applications discussed above is a watermark W that depends ....

.... unwatermarked image in a non trivial manner while making it possible to recover the watermark without having to access an information about the original image (oblivious watermarking) Such watermarks playan important role for authenticating videos or still images taken with a digital camera [4]. As another application of robust hash functions, we mention indices for efficient image database search. There are many quantities that could be derived from images using which one can search a database in an efficient manner. Many indices are based on colo information that can be extracted ....

J. Fridrich, "Methods for Tamper Detection in Digital Images", Proc. ACM Multimedia 1999.

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J. Fridrich, "Methods for tamper detection in digital images," Proc. ACM Workshop on Multimedia and Security, pp. 19--23, Orlando, FL, October 30--31, 1999.

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