21 March 2005 Audio watermarking and partial encryption
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Today two technologies are applied when protecting audio data in digital rights management (DRM) environments: Encryption and digital watermarking. Encryption renders the data unreadable for those not in the possession of a key enabling decryption. This is especially of interest for access control, as usage of the audio data is restricted to those owning a key. Digital watermarking adds additional information into an audio file without influencing quality our file size. This additional information can be used for inserting copyright information or a customer identity into the audio file. The later method is of special interest for DRM as it is the only protection mechanism enabling tracing illegal usage to a certain customer even after the audio data has escaped the secure DRM environment. Existing methods combine these methods in first embedding the watermark and than encrypting the content. As a more efficient alternative, we introduce a combined watermarking and encryption scheme where both mechanisms are transparent to each other. A watermark is embedded in and detected from an encrypted or unencrypted file. The watermark also does not influence the encryption mechanism. The only requirement for this method is a common key available to both algorithms.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Martin Steinebach, Sascha Zmudzinski, Torsten Bolke, "Audio watermarking and partial encryption", Proc. SPIE 5681, Security, Steganography, and Watermarking of Multimedia Contents VII, (21 March 2005); doi: 10.1117/12.586875; https://doi.org/10.1117/12.586875

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