Steganography

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Group Presentation

Shaikh Shabbir Munir

Muhammed Ishaque Ahmed Patel

WRO 0508431

WRO 0509055

RVG HOSTEL ANDHERI-(WEST),TIME 8:00AM TO 12:00PM DATED-23rd Sep 2013 TO 20thOCT 2013

A presentation on

“Steganography”

BY

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REASONS FOR SELECTING TOPIC

It was with this basic idea that we chose the topic of steganography-so that we would get the chance to learn and explore more about the lesser known world of steganography

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INTRODUCTION “Steganography”

• FROM THE GREEK WORD “STEGANO” MEANING "COVERED” AND

• GRAPHY MEANING "WRITING“

• The art of secret (hidden) writing

steganography

στεγανός

covered

γραφία

writing

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Steganography

Art and science of communicating in a way that hides the existence of a message

signal or pattern imposed on content

◦ persistent under transmission◦ not encryption

original image/file is intact◦ not fingerprinting

fingerprinting leaves separate file describing contents

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STEGANOGRAPHY UNDER VaRIOUS MEDIA

Steganography in “TEXT”

Steganography in “IMAGES”

Steganography in “AUDIO”

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STEGANOGRAPHY IN TEXT

It involves three types of coding:

Line-Shift Coding : Here, text lines are vertically shifted

to encode the document uniquely.

Word-Shift Coding : The codewords are coded into a

document by shifting the horizontal locations of words

within text lines, while maintaining a natural spacing appearance.

Feature Coding : In feature coding, certain text features

are altered, or not altered, depending on the codeword.

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STEGANOGRAPHY IN IMAGES

Image Compression: Image compression offers a solution to large image files. Two kinds of image

compression are lossless and lossy compression. Both methods save storage

space but have differing effects on any uncompressed hidden data in

theimage.

“Lossy” JPEG(Joint Photographic Experts Group) format files, offers high

compression, but may not maintain the original image's integrity. Hence it is called

“lossy”.

“Lossless” compression maintains the original image data exactly, It is thus more

favored by steganographic techniques. Eg: (BMP ),(GIF) Formats.

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STEGANOGRAPHY IN AUDIO

Transmission medium :

Bender’s transmission environments

Digital end-to-end environment.

Increased/decreased resampling environment.

Analog transmission and resampling.

''Over the air'' environment.

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Steganography Sample Website

Here is the link for Sample Stenographic tool Website:

http://mozaiq.org/

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Bibliography:

WWW.GOOGLE.COM

WWW.WIKIPEDIA.COM

WWW.THUNDERSTONE.COM

WWW.CITI.UMICH.EDU

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