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Statistical Tools for Multimedia Forensics

This paper reports an approach of using statistical tools for forensic authentication of multimedia recordings, with a specific focus on digital audio compression effects analysis. The gradual shift from analogue to digital recording systems, rapid developments in the media world and the increasingly widespread availability of digital signal processing equipment and software, as well as their ease of operation, generated a significant increase in the number of attempts to use digital multimedia evidence in every sector of litigation and criminal justice. Thus it is necessary to develop different authentication methods for digital audio recordings and provide experts the necessary tools to detect digital compression traces. A brief description is given to different compression algorithm effects, possibilities to detect them and authors’ results on this topic. By using statistical tools or combining them with other methods, one can determine a previous compression and assess the authenticity of a digital recording.

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