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Data Hiding within Audio Signals

Data Hiding within Audio Signals. Matthew Wiedemer CSE691 November 20, 2001. Overview. Steganography systems and their goals Audio stego systems Autocorrelation modulation scheme. Stego Key. Stego Key. Stego Object Transmission. Embeddor. Extractor. Cover Object. Embedded Data.

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Data Hiding within Audio Signals

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  1. Data Hiding within Audio Signals Matthew Wiedemer CSE691 November 20, 2001

  2. Overview • Steganography systems and their goals • Audio stego systems • Autocorrelation modulation scheme

  3. Stego Key Stego Key Stego Object Transmission Embeddor Extractor Cover Object Embedded Data Embedded Data Stego Systems • Data hiding, covert communications • Evade detection

  4. Basic Stego System Goals • Transparent • Robust • Survive compression encoding/decoding • Survive attack intended to remove/forge object • Simplicity of embeddor and extractor • High throughput • Low probability of false detection (if using watermarks)

  5. Audio Stego Systems • Add small amount of distortion • Use audio masking: human ear can’t distinguish weak and strong signals at same time • Direct sequence spread spectrum – uses audio masking, susceptible to time scale modification • Tone insertion – easy to find through frequency analysis • Echo insertion – complex extraction, low robustness • LSB – low robustness • Compression-based – only contains watermark when compressed

  6. Autocorrelation Modulation Scheme • Attains goals of high robustness, high transparency • Complex • Highly configurable

  7. Stego Key Stego Key Stego Object Transmission Embeddor Extractor Cover Signal Embedded Data Embedded Data Autocorrelation Modulation System Model

  8. Stego Signal Cover Signal Stego Key Stego Key Stego Object Transmission Variable Gain or Attenuation Embeddor Extractor Cover Signal Embedded Data Filter Delay or Advance Gain Calculator Filtered Cover Signal Embedded Data Embedded Data Embeddor *multiple difference signal components may be used **stego key is set of coefficients, constants used in block equations

  9. Stego Key Stego Key Stego Object Transmission Embeddor Extractor Cover Signal Embedded Data Embedded Data System Model Continued

  10. Extractor |*|² Short-Term Integrator Regenerator Normalization Embedded Data Filtered Signal Short-Term Integrator Filter Stego Signal Delay

  11. Conclusion • Designing a robust, secure, transparent, lossless stego system is difficult and complex; requires significant signal processing • An ideal solution would satisfy the needs of the music industry • Autocorrelation modulation satisfies these requirements better than any other audio stego/watermarking system available today

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