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Audio

STEGANOGRAPHY

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STEGANOGRAPHY

Art andscience of

writing hiddenmessages

No one apart

from thesender andintendedrecipient,

suspects theexistence ofthe message

A form ofsecuritythrough

obscurity

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STEGANOGRAPHY TECHNIQUE

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MESSAGE

EmbeddedData

Audio File

Hidden

MESSAGE

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Audio

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AUDIO TERMS

Samplingis the process in which

the analogue values are only captured at regular

time intervals.

Quantizationconverts each input value into one

of a discrete value.

Popularsampling rates for audio include 8 kHz,

9.6 kHz, 10kHz, 12 kHz, 16 kHz, 22.05 kHz and

44.1 kHz

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Audio File Types

File Format

Uncompressed

WAV AIEF

Compressed

Lossy

Mp3, AAC, WMA

Loseless

ALAC, FlAC,WavPack

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WHY .WAV ?

Most popular Audio format

Dont lose any quality in recording

Easier format for Development

No Compression!!

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WAVE FILE FORMAT

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WAVE FILE FORMATHEX Values of Wave

File Size Chunk Length of Format

Audio AttributesData Chunk

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SteganographyTechniques

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TYPES OF STEGANOGRAPHY

LSB CODING

PHASE CODING

ECHO HIDING

SPREAD

SPECTRUM

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WHY LSB?

Low computational complexity

Easier Implementation

Variation in choosing LSB

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LSB ALGORITHM

Receives theaudio fileconvert it into bitpattern.

Step1

Each characterin the message isconverted into

bit pattern.

Step 2 Check which LSB

to Replace ByRC4 Algorithm

Step 3

Replaces the LSBbit from audiowith LSB bit fromcharacter in the

message.

Step 4

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CONT. ALGORITHM : CHANGING BITS

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CONT. ALGORITHM : CHANGING BITS

RC4 Algorithm

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RC4 ALGORITHM

RC4

The key-scheduling

algorithm (KSA)

The pseudo-randomgeneration

algorithm (PRGA)

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The key-scheduling algorithm (KSA)

initialize the permutation in the array "S

Array "S" is initialized to the identity permutation

Swap values of S[i] and S[j].

RC4 ALGORITHM

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The pseudo-random generation algorithm (PRGA)

Used as many iterations as are needed

RC4 ALGORITHM

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Live Demo

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QUESTIONS

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Source Code :

http://www.codeproject.com/Articles/6960/Steganography-

VIII-Hiding-Data-in-Wave-Audio-Files

Other Online

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.9413&rep=rep1&type=pdf

deepaldhariwal.weebly.com/uploads/4/9/0/9/4909109/report.docx

http://en.wikipedia.org/wiki/RC4

RESOURCES

http://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.9413&rep=rep1&type=pdfhttp://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.9413&rep=rep1&type=pdfhttp://en.wikipedia.org/wiki/RC4http://en.wikipedia.org/wiki/RC4http://en.wikipedia.org/wiki/RC4http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.9413&rep=rep1&type=pdfhttp://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.9413&rep=rep1&type=pdfhttp://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.9413&rep=rep1&type=pdfhttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Fileshttp://www.codeproject.com/Articles/6960/Steganography-VIII-Hiding-Data-in-Wave-Audio-Files