10-06-2017, 06:58 AM
STEGANALYSIS OF LSB INSERTION METHOD IN UNCOMMPRESSED
IMAGES USING MATLAB
[attachment=18154]
ABSTRACT
In this paper we have explained a steganalytic tool
to detect the presence of hidden message in LSB
steganography. It is process of hiding secret
information in a cover image. Here we have used
LSB insertion method using discrete algorithms.
Steganographic programs use the Least
Significant Bit (LSB) embedding as the method of
choice for message hiding 24-bit, 8-bit color
images and grayscale images. It is commonly
understood that changes to the LSB of color
cannot be detected due to noise that is always
presents in digital images.
INTRODUCTION
Steganography brings science to the art of hiding
information. The purpose of steganography is to
convey a message inside of a conduit of
misinterpretation such that the existence of the
message is both hidden and difficult to recover
when discovered. Basically the information hiding
process in a Steganoraphic system starts by
identifying a cover medium s redundant bits. The
embedding process creates a stego medium by
replacing these redundant bits with data from the
hidden message.
LSB INSERTION TECHNIQUES
In LSB insertion method, a random number
generator is used to randomly distribute and hide
the bits of a secret message into the least
significant bit of the pixels within a cover image,
a common approach to achieve this is the random
interval method. The transmitting and receiving
end share the stego key, the output is a random
sequence K1 ..Kn where n is the length of
message bits.
INDEX.M
It maintains the graphical user interface of
program for making user friendly software
index.m is main file, which cause various other
module it is actually the simplest part you just
have to select any of GUI component such as push
button, slider or any else and then double click on
it a inspector dialog box will open in which there
will be various option such as create function, edit
function and various other option click on create
function block guide will automatically create a
function whenever you will press that button you
will jump to its callback. Now job of programmer
is to edit this function according to its use.
CRTMTRX.M
This module is not called by main program
(index.m) but by encoding and decoding module.
It uses a key for security purpose. A zero matrix
provided by encoding module and finally form a
matrix which modulated form of zero matrix
whose 7000 element are 1. These are those
element we store the information in picture
message. Finally this module is also called by
decoding module so that we can obtain those
position where information is hidden and extract
that information easily.
