Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI
Now showing 1 - 10 of 63
PublicationDigital signatures based on invertible watermarks for video authentication( 2005)
;Hauer, E. ;Dittmann, J.Steinebach, M.
PublicationSecure production of digital media( 2005)
;Steinebach, M.C.Dittmann, J.Today more and more media data is produced completely in the digital domain without the need of analogue input. This brings an increase of flexibility and efficiency in media handling, as distributed access, duplication and modification are possible without the need to move or touch physical data carriers. But this also reduces the security of the process: Without physical originals to refer to, changes in the material can remain unnoticed, at the end making the manipulated data the new original. Theft and illegal copies in the digital domain can happen without notice and loss of quality. We therefore see the need of setting up secure media production environments, where access control, integrity and copyright protection as well as traceability of individual copies are enabled. Addressing this need, we design a framework for media production environments, where mechanisms like encryption, digital signatures and digital watermarking help to enable a flexible yet secure handling and processing of the content.
PublicationDesign principles for active audio and video fingerprinting( 2005)
;Steinebach, M.Dittmann, J.
PublicationA high-capacity block based video watermark( 2004)
;Thiemert, S. ;Vogel, T. ;Dittmann, J.Steinebach, M.
PublicationDigitale Audiowasserzeichen im Archivbereich - Das H2O4M Projekt( 2003)
;Steinebach, M. ;Hauer, E.Dittmann, J.
PublicationWatermarking-based digital audio data authentication( 2003)
;Steinebach, M.Dittmann, J.Digital watermarking has become an accepted technology for enabling multimedia protection schemes. While most efforts concentrate on user authentication, recently interest in data authentication to ensure data integrity has been increasing. Existing concepts address mainly image data. Depending on the necessary security level and the sensitivity to detect changes in the media, we differentiate between fragile, semifragile, and content-fragile watermarking approaches for media authentication. Furthermore, invertible watermarking schemes exist while each bit change can be recognized by the watermark, which can be extracted and the original data can be reproduced for high-security applications. Later approaches can be extended with cryptographic approaches like digital signatures. As we see from the literature, only few audio approaches exist and the audio domain requires additional strategies for time flow protection and resynchronization. To allow different security levels, we have to identify relevant audio features that can be used to determine content manipulations. Furthermore, in the field of invertible schemes, there are a bunch of publications for image and video data but no approaches for digital audio to ensure data authentication for high-security applications. In this paper, we introduce and evaluate two watermarking algorithms for digital audio data, addressing content integrity protection. In our first approach, we discuss possible features for a content-fragile watermarking scheme to allow several postproduction modifications. The second approach is designed for high-security applications to detect each bit change and reconstruct the original audio by introducing an invertible audio watermarking concept. Based on the invertible audio scheme, we combine digital signature schemes and digital watermarking to provide a public verifiable data authentication and a reproduction of the original, protected with a secret key.
PublicationPsycho-akustische Modelle für StirMark Benchmark - Modelle zur Transparenzevaluierung( 2003)
;Lang, A. ;Dittmann, J.Steinebach, M.
PublicationDigitale Wasserzeichen - Grundlagen - Anwendungen - Grenzen( 2002)
;Steinebach, M.Dittmann, J.Digital watermarking has become an often-discussed approach for digital rights management (DRM). Owner authentication, identification of pirates and even prevention of illegal copies are addressed. We provide an overview of watermarking technology. Furthermore we identify problems in watermarking-based DRM and show application scenarios: H2O/sub 4/M provides a combined security approach including PKI and biometrics. Transmark is a DRM example for media on demand. We discuss new methods of advertisement and content-protection for digital media.
PublicationStirMark Benchmark: Audio watermarking attacks based on lossy compression( 2002)
;Steinebach, M. ;Lang, A.Dittmann, J.StirMark Benchmark is a well-known evaluation tool for watermarking robustness. Additional attacks are added to it continuously. To enable application based evaluation, in our paper we address attacks against audio watermarks based on lossy audio compression algorithms to be included in the test environment. We discuss the effect of different lossy compression algorithms like MPEG-2 audio Layer 3, Ogg or VQF on a selection of audio test data. Our focus is on changes regarding the basic characteristics of the audio data like spectrum or average power and on removal of embedded watermarks. Furthermore we compare results of different watermarking algorithms and show that lossy compression is still a challenge for most of them. There are two strategies for adding evaluation of robustness against lossy compression to StirMark Benchmark: (a) use of existing free compression algorithms (b) implementation of a generic lossy compression simulation. We discuss how such a model can be implemented based on the results of our tests. This method is less complex, as no real psycho acoustic model has to be applied. Our model can be used for audio watermarking evaluation of numerous application fields. As an example, we describe its importance for e-commerce applications with watermarking security.
PublicationAudio watermarking quality evaluation: Robustness to DA/AD processes( 2002)
;Steinebach, M. ;Lang, A. ;Dittmann, J.Neubauer, C.Audio watermarking has become an important technology for the recording and advertisement industry. Today's embedding and detection strategies often rely on digital/ high quality channels, like CD or mp3. However for numerous applications, watermarks surviving noisy analog environments are better suited or even required. Using such schemes allows to identify, audio signals with monitoring devices which are 'listening' to the incoming signals. In the same way, illegal recordings of concerts can be identified. In this paper we describe a test environment for noisy, acoustic, (analog) channels and present results obtained from a particular watermarking scheme. We identify changes in the affected audio material, like frequency response or the amount of noise added to the signal. In order to do automatic robustness evaluations of watermarking schemes, the Stirmark Benchmark environment can be used. We analyze if it is possible to simulate an acoustic, noisy DA/AD environment with filters, quantization and noise generators. Based on the presented test results, we identify the parameters relevant for watermarks to successfully survive noisy acoustic channels and thereby provide valuable hints for audio watermark designers. We also describe a design concept for a DA/AD simulation.