The document discusses steganography, which is the art of hiding information within other files like images. It explains how early Greeks used steganography by engraving messages in wood and covering it with wax. Modern steganography uses computers to hide information by changing the least significant bit of image file bytes, which is imperceptible to the human eye. The document also provides an overview of a proposed steganography application that allows users to hide text within an image file and later extract the hidden text.

1. BY
N.HIMASINDHU
P.SHANKAR
K.VAMSHI
J.RAM BABU
1

2. The term Steganography comes from the Greek words for
covered writing.
Steganography is the art of covered or hidden writing.
The purpose of steganography is covert communication-to
hide the existence of a message from a third party.
2

3. Thousands of years ago, the
Greeks used staganography to hide
information from their enemies.
One hiding method was to engrave a
message in a block of wood, then
cover it with wax, so it looks like a
blank wax tablet. when they wanted to
retrieve the message, they would
simply melt off the wax.
3

4. We can also perform steganography using a computer.
Everything in a computer is stored as 1’s and 0’s (a bit).
Bits are grouped in sets of eight, one set is called a byte.
1 0 10011000
11111111
0 00001000
Bits Bytes
One byte can be used to represent each letter of the
alphabet. This is what is used in text files.
01000001 = A
01000010 = B
01000011 = C
4

5. Pictures are made up of lots of little dots called pixels.
Each pixel is represented as 3 bytes – one for red, one for
green and one for blue.
11111000 11001001 00000011
248 201 3
Each byte is interpreted as a number, which is how much of
that colour is used to make the final colour of the pixel.
248 + 201 + 3 = Orange Colour
5

6. The difference between two colours that differ by one in
either one red, green or blue value is impossible to see
with the human eye.
248 + 201 + 3 = Original Colour
248 + 201 + 4 = Blue +1
247 + 201 + 3 = Red -1
If we change the least significant (last) bit in a byte, we
either add or subtract one from the value it represents.
This means we can overwrite the last bit in a byte without
affecting the colour it appears to be.
6

7. We can use images to hide things if we replace the last
bit of every colour’s byte with a bit from the message.
Message: A 01000001
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
11111000 11001001 00000011
Pixel 3:
New image:

8. 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 With Hidden
Message
8

9. EXISTING SYSTEM PROPOSED SYSTEM
This application is platform This application is platform
independent.
dependent.
Supports both command mode
Supports any one either
and graphical mode
command mode or graphical
mode. Provide interactive interface
through which user can
Should be applicable for any interact with different types of
kind of image size for Images, Image Sizes and Text
steganography. Messages.
9

10. HARDWARE REQUIREMENTS
Processor:: Pentium-III (or) Higher
Ram:: 64MB (or) Higher
Cache:: 512MB
Hard disk:: 10GB
SOFTWARE REQUIREMENTS
Tools:: Micro Soft Front
Operating System:: WindowsNT/2000
Client Side:: GUI
10

11. In this we have 2 modules
Steg module : In this module User need to write any secret
information in Text area provided and need to select an Image file to
which User wants to append the Secret Information Text .
In UnSteg module the Encrypted Image will be selected and
Steganography Application will start decrypting it with each and
every pixel of the Image and displays the output i.e. Secret Text
Information
11

12. This is output screen
12

13. This is a steg module in which secret text is
typed as shown above
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14. Selecting image and appending the secret information in
to image which is also steg module
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15. The secret information is added in this image
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16. This is unsteg module ,i.e. the encrypted image
file is selected.
The encrypted image file is saved in the same
folder of the image which we are selected to
encrypt 16

17. Here decrypting image is done ,which is also an unsteg module
17

18. This is decrypted secret information from encrypted image
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19. Technical feasibility
Operational feasibility
Economical feasibility:
 Cost benefit analysis
 Long-term returns
 Maintenance costs
19

20. Class diagram of steganography
encryption
steg text
image
message
encryption
image
takeimage()
selectmessage()
taketext()
selectimage()
encrypt()
createnewimage()
decryption
unsteg decrypt
decryption displayimage
takedecryptedimage() decrypt()
displayimage()
20

21. Sequence diagram for steganography
user steg module Encryption unsteg decryption
1.select message and image
2.Take Message & image
3.create a new image file with encrypted message
4.send new image file
5.select encrypted image file
6.take encrypted image
7.display secret text
8.display decrypted message
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22. Usecase diagram for steganography
select secret text
select image file
user
select steg module
select unsteg module
22

23. Allows user to hide large amounts of information within image and audio
files.
These forms of steganography often are used in conjunction with
cryptography so that the information is doubly protected
Stego may, in fact, be all too real —
There have been several reports that the terrorist
organization behind the September 11 attacks in New York City,
Washington, D.C., and outside of Pittsburgh used steganography as one of
their means of communication.
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