Stenography with Tool

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Roll No
BSIT-2013-Eve-3045
Section
Evening
Roll No
7th Semester
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Presentation Outline

• Steganography
• Introduction
• History
• General diagram
• Network security Steganography
• Techniques of Steganography
• Image steganography
• Textual steganography
• Application of steganography
• Advantages of steganography
• Disadvantages of steganography

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What is steganography?
This word or term is derived from combing two
Greek words Stegnos means covered, concealed or
protected and Graphein meaning writing. So
Steganography literally means Covered
Writing Definition

more It us an art and science of hiding
information by combining it in some other
data. Goals To hide a secret message within
other object. Do it in such a way that s presence
of message is not visible.
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Historical Example

• Invisible Ink
• Microdot
• Dots which are printed on the paper
• and only visible by using microscope.
• A Person Head

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General Diagram Of Steganography
Extract
The cover provides a host for transporting the
hidden info.
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Steganography-Carriers

• Most attractive multimedia objects
• Image Steganography
• Textual Steganography
• Audio Steganography

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Image Steganography
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Image Attributes

• Digital images are made up of pixels
• The arrangements of pixels makes an image
• 8-bit and 24-bit images are common
• The larger the image size, the more information
  you can hide.

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Reasoning For Using Digital Images

• It is the most widely used medium being used
  today
• Takes advantages of our limited visual perception
  of colors
• This field is expected continually grow as
  computer graphics power also grows
• Many programs are available to apply steganography

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Image Steganography

•  
• Two types of compression
• Lossless (gif)
• Lossy (jpeg)
•  
• Sometimes concealed message inserted as a comment
  
• Sometimes the accuracy of the message is
  sacrificed slightly

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Techniques Of Digital Steganography

1. LSB (Least Significant Bit)
2. Filtering and masking
3. Algorithms and transformations

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1.LSB (Least significant digit)
The most common and popular method of modern day
steganography is to make use of the a pictures
information. This technique works best when the
image file is larger then the message file and if
image is grayscale like..
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We can use images to hide things if we replace
the last bit of every color's byte with a bit
from the message. Message A Image with 3
pixels Pixel 1 11111000 11001001
00000011 Pixel 2 11111000 11001001
00000011 Pixel 3 11111000 11001001
00000011 Now we hide our message in the
image Pixel 1 11111000 11001001 00000010
Pixel 2 11111000 11001000 00000010 Pixel
3 11111000 11001001 00000011 New image
01000001
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Even if we do this across a big image and with a
really large message, it is still hard to tell
that anything is wrong
Original Image
Informal Image
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Advantages Of LSB Insertion

• A major advantage if the LSB algorithm is it is
  quick and easy.
• LSB insertion is secure.
• Theoretically, a small change in the least
  significant bit should not affect the overall
  representation if the number significantly.
• Lossless algorithm
• No visual change in image.

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Masking And Filtering
Masking and filtering is where information is
hidden inside of a image using digital watermarks
that includes information such as copyright,
ownership , or licenses. The purpose is
different from traditional steganography since it
is extending the amount if information.
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Watermark Example
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Textual steganography

• It is also called null cipher message.
• The premise for null cipher is to hide an
  important message within an uninteresting
  innocent message.

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Apparently neutrals protest is thorougly
discounted and ignored. Isman hard hit. Blockage
issue affects pretext for embargo on by-products,
ejecting suets and vegetable oils.
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Pershing sails from ny june I
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Application Of Steganography
It can be used wherever data security is required
Government agencies .. Who store documents
which are very sensitive
Business people Preserve legal and customer
specific financial documents
Banks and other financial institutions ..
safeguard their databases
Privates organizations who want to safeguard
their sensitive information
Privates organizations who want to safeguard
their sensitive information
Digital watermarking Digital signature Digital
linkage ar
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Advantages of steganography

• It is in the way of hiding not the information
  but the password to reach that information
• Difficult to detect, only receiver can detect
• Can be applied differently in digital image,
  audio video file.
• It can be done faster with the large no
  softwares.

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Disadvantages of steganography

• In sending and receiving information can be
  leaked.
• The confidentiality if information is maintained
  by the algorithms and if the algorithms are known
  then its all over.
• If this techniques is gone in the wrong way hands
  like hackers, terrorist, criminals then this can
  be very much dangerous for all.

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Practical Example Demonstration
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Thank You
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More Definitions about Steganography

• The practice of concealing message or information
  within other non-secret text or data.
• Steganography is the practice of concealing a
  file, message, image or video within other file,
  message, image or video.

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