Psychoacoustic Approaches to Audio Steganography
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Presentation slides corresponding to a paper that explores methods of audio steganography with emphasis on psychoacoustic approaches. Specifically, it describes a project that had the requirement of hiding a text-based message inside an audio signal with minimal or no distortion of the signal as perceived by the human ear. The theory and experimental results of each approach are discussed.
![Audio Steganography ,[object Object],[object Object],[object Object]](https://image.slidesharecdn.com/eces434finalproject-100916014741-phpapp02/85/Psychoacoustic-Approaches-to-Audio-Steganography-1-320.jpg)
![Introduction ,[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Psychoacoustic Approaches to Audio Steganography
- 6. LSB System Design Copy Header & Data Size Convert Txt->Bin Embed Identifier,Len, Msg Write New Wav File Extract Length of Message Check for Identifier Extract LSB from WavData ConvertBin->Txt Embed Message Recover Message
- 7. Wav File Format Start Byte Len Name 0 12 RIFF Header 12 24 Wav Format Subchunk 36 8 Data Subchunk (ID and Size) 44 * Data
- 9. Mono Wav LSB
- 10. Stereo Wav LSB
- 11. LSB Results Mono Stereo Input Output
- 13. AM System Design Calculate Block Size Convert Txt->Bin Slice Time Blocks Scale Each Slice Slice Time Blocks Calculate Block Size Compare Mag. of Slices Convert Bin->Txt Embed Message Recover Message
- 15. Mono Wav AM
- 16. Stereo Wav AM
- 17. AM Results Mono Stereo Input Output
Editor's Notes
- Art and science writing hidden messages no one suspects the existence of the message security through obscurity means "concealed writing" in Greek
- Shifting quantization bin/level by 0 or +-1, shifting time-domain amplitude, hiding as excessive quantization “noise”
- The dec2bin function in MATLAB produces a string of digit characters, while the de2bi function used in the last section produces a vector of numbers.