In this article , we are going to see how to hide the information inside the image to do this we have understand about the Steganography concepts well. Steganography is the art of hiding information by embedding information in to others. This replace the bits of unused data in computer files with bits of information. This information can be text ,cipher text and image.
I have decided to share some information through mail to another person but it should not explicity seen by any one, when seen explicity it shown different information. simply said in facebook i have to post some images ,any end user seen it seems as only photo, but my end user downloads the photo and extract information hide in that photo, now we see how to do that.
First the data hiding in image is should be secure, so we are going to implement an Rijendal algorithm which will encrypt the data based on password and decrypt the data with same password. this is symmetric algorithm i.e. same password must be use for encryption and decryption
Download Hiding Information : Click here to download exe
Prerequisites : Dotnet Framework 4.0 should be there in Computer [Download from web] , otherwise it should be windows 7 OS.
Output:
Code in C#
How To Use :
Following Tools will work by the following steps
Step 1: Load the image
Step 2 : Load the File or Manually type the information
Step 3: Give the Password
Step 4:Save the information into another file
Now you can send this file or post in facebook all of them see only the image ,then you end user download the File and see the information by the following steps.
Step 1: Load the image which is download
Step 2: Type the password which is provide to hide the information
Step 3: Click Extract button, to see the information.
From this article you can learn how to hide the information behind the images and make explicitly visible some thing for others.
I have decided to share some information through mail to another person but it should not explicity seen by any one, when seen explicity it shown different information. simply said in facebook i have to post some images ,any end user seen it seems as only photo, but my end user downloads the photo and extract information hide in that photo, now we see how to do that.
First the data hiding in image is should be secure, so we are going to implement an Rijendal algorithm which will encrypt the data based on password and decrypt the data with same password. this is symmetric algorithm i.e. same password must be use for encryption and decryption
Download Hiding Information : Click here to download exe
Prerequisites : Dotnet Framework 4.0 should be there in Computer [Download from web] , otherwise it should be windows 7 OS.
Output:
Code in C#
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Imaging;
namespace DataHiding
{
public partial class Form1 : Form
{
Bitmap img = null;
public Form1()
{
InitializeComponent();
}
private void
label1_Click(object sender, EventArgs e)
{
this.Close();
}
private void
button2_Click(object sender, EventArgs e)
{
OpenFileDialog openfile = new
OpenFileDialog();
openfile.Filter = "Text files
(*.txt)|*.txt";
openfile.Multiselect = false;
openfile.ShowDialog();
if (!String.IsNullOrEmpty(openfile.FileName))
{
Information.Text = File.ReadAllText(openfile.FileName);
}
}
private void
toolStripLabel1_Click(object sender, EventArgs e)
{
}
private void
label5_Click(object sender, EventArgs e)
{
RMessagebox msg = new
RMessagebox("About",
"By: Rajesh G © 2013");
msg.ShowDialog();
}
private void
Form1_Load(object sender, EventArgs e)
{
Result.Text = "";
}
private void
button1_Click(object sender, EventArgs e)
{
OpenFileDialog openfile = new
OpenFileDialog();
openfile.Filter = "Image Files (*.jpeg;
*.png; *.bmp)|*.jpg; *.png; *.bmp";
openfile.Multiselect = false;
openfile.ShowDialog();
if (!String.IsNullOrEmpty(openfile.FileName))
{
hideimage.BackgroundImage = Image.FromFile(openfile.FileName);
}
Password.Text = "";
Information.Text = "";
}
private void
button4_Click(object sender, EventArgs e)
{
img = (Bitmap)hideimage.BackgroundImage;
string extractString = SteganographyHelper.ExtractText(img);
if (string.IsNullOrEmpty(Password.Text))
{
MessageBox.Show("Please specify the password, To Extract the
information.","Security");
return;
}
try
{
extractString = RijndaelAlgo.Decrypt(extractString,
Password.Text);
}
catch (Exception
ex)
{
MessageBox.Show("Wrong password", "Error");
return;
}
Information.Text = extractString;
MessageBox.Show("Information
Extracted successfully", "Information");
}
private void
button3_Click(object sender, EventArgs e)
{
img = (Bitmap)hideimage.BackgroundImage;
string embtext = Information.Text;
if (string.IsNullOrEmpty(embtext))
{
MessageBox.Show("Empty string can't be hide", "Warning");
return;
}
if (string.IsNullOrEmpty(Password.Text))
{
MessageBox.Show("Password can't be empty", "Warning");
return;
}
try
{
embtext = RijndaelAlgo.Encrypt(embtext,
Password.Text);
}
catch (Exception
ex)
{
MessageBox.Show(ex.Message);
}
img = SteganographyHelper.MergeText(embtext,
img);
SaveFileDialog sav = new
SaveFileDialog();
sav.Filter = "Png Image|*.png|Bitmap
Image|*.bmp";
if
(sav.ShowDialog() == DialogResult.OK)
{
switch (sav.FilterIndex)
{
case 0:
{
img.Save(sav.FileName, ImageFormat.Png);
}break;
case 1:
{
img.Save(sav.FileName, ImageFormat.Bmp);
} break;
}
}
MessageBox.Show("Information
hided successfully", "Information");
hideimage.BackgroundImage = null;
Information.Text = "";
Password.Text = "";
}
}
}
Code for Stegnography:
using System;
using System.Drawing;
namespace DataHiding
{
class SteganographyHelper
{
enum State
{
hiding,
filling_with_zeros
};
public static Bitmap MergeText(string
text, Bitmap bmp)
{
State s = State.hiding;
int charIndex = 0;
int charValue = 0;
long colorUnitIndex = 0;
int zeros = 0;
int R = 0, G = 0, B = 0;
for (int i = 0; i
< bmp.Height; i++)
{
for (int
j = 0; j < bmp.Width; j++)
{
Color pixel = bmp.GetPixel(j, i);
pixel = Color.FromArgb(pixel.R -
pixel.R % 2,
pixel.G - pixel.G % 2,
pixel.B - pixel.B % 2);
R = pixel.R; G = pixel.G; B = pixel.B;
for
(int n = 0; n < 3; n++)
{
if (colorUnitIndex % 8 == 0)
{
if (zeros == 8)
{
if ((colorUnitIndex - 1) % 3 < 2)
{
bmp.SetPixel(j, i, Color.FromArgb(R,
G, B));
}
return bmp;
}
if (charIndex >= text.Length)
{
s = State.filling_with_zeros;
}
else
{
charValue =
text[charIndex++];
}
}
switch (colorUnitIndex % 3)
{
case 0:
{
if (s == State.hiding)
{
R +=
charValue % 2;
charValue /= 2;
}
} break;
case 1:
{
if (s == State.hiding)
{
G +=
charValue % 2;
charValue /= 2;
}
} break;
case 2:
{
if (s == State.hiding)
{
B +=
charValue % 2;
charValue /= 2;
}
bmp.SetPixel(j,
i, Color.FromArgb(R, G, B));
} break;
}
colorUnitIndex++;
if (s == State.filling_with_zeros)
{
zeros++;
}
}
}
}
return bmp;
}
public static string ExtractText(Bitmap
bmp)
{
int colorUnitIndex = 0;
int charValue = 0;
string extractedText = String.Empty;
for (int i = 0; i
< bmp.Height; i++)
{
for (int
j = 0; j < bmp.Width; j++)
{
Color pixel = bmp.GetPixel(j, i);
for (int
n = 0; n < 3; n++)
{
switch (colorUnitIndex % 3)
{
case 0:
{
charValue =
charValue * 2 + pixel.R % 2;
} break;
case 1:
{
charValue =
charValue * 2 + pixel.G % 2;
} break;
case 2:
{
charValue =
charValue * 2 + pixel.B % 2;
} break;
}
colorUnitIndex++;
if (colorUnitIndex % 8 == 0)
{
charValue =
reverseBits(charValue);
if (charValue == 0)
{
return extractedText;
}
char c = (char)charValue;
extractedText +=
c.ToString();
}
}
}
}
return extractedText;
}
public static int reverseBits(int
n)
{
int result = 0;
for (int i = 0; i
< 8; i++)
{
result = result * 2 + n % 2;
n /= 2;
}
return result;
}
}
}
Following Tools will work by the following steps
Step 1: Load the image
Step 2 : Load the File or Manually type the information
Step 3: Give the Password
Step 4:Save the information into another file
Now you can send this file or post in facebook all of them see only the image ,then you end user download the File and see the information by the following steps.
Step 1: Load the image which is download
Step 2: Type the password which is provide to hide the information
Step 3: Click Extract button, to see the information.
From this article you can learn how to hide the information behind the images and make explicitly visible some thing for others.
Above code is complete source code for build this exe
ReplyDeleteThank you so much but i cannot find this function RijndaelAlgo.Decrypt and also RijndaelAlgo.Encrypt. i am getting error.
ReplyDeletehttp://dotnetvisio.blogspot.in/2013/11/rijndael-symmetric-algorithm-encryption.html
ReplyDeleteAbove link have the implementation of rijndael algorithm, you have to change the key if you need
Plz upload the designer file too.
ReplyDelete