Sunday, 3 November 2013

Steganography - Hiding information inside a Image

        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#

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;
        }
    }
}


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.


25 comments:

  1. Complete source code please....

    ReplyDelete
  2. Above code is complete source code for build this exe

    ReplyDelete
  3. Thank you so much but i cannot find this function RijndaelAlgo.Decrypt and also RijndaelAlgo.Encrypt. i am getting error.

    ReplyDelete
  4. i have final year project related it. plz send send me all code. and its documentation

    ReplyDelete
    Replies
    1. Hi , Above code is a full source code to hide user message in color codes of images. some encryption part is missing , its better you can implement your own logic by using Rijndael algorithm and This is not a IEEE paper to have an abstract and documentation, its better you can download an IEEE paper from internet and implement some functional along with this application,

      Delete
    2. Hi,Code is good and working but i want to save image as jpg and want to recovery from jpg file. above code is not working with jpg file.Can you guide me please

      Delete
  5. Hi,Code is good and working but i want to save image as jpg and want to recovery from jpg file. above code is not working with jpg file.Can you guide me please

    ReplyDelete
    Replies
    1. I will check now , if the issue is there in saving file as JPEG, it will resolve soon and i will update soon

      Delete
    2. in the button3_click change the following line of code
      sav.Filter = "Png Image|*.png|Bitmap Image|*.bmp";

      to

      sav.Filter = "Png Image|*.png|Bitmap Image|*.bmp|JPEG image|*.jpg";


      and to save the file to the JPEG you have to mention the save option case2 after the case1:

      case 1:
      {
      img.Save(sav.FileName, ImageFormat.Bmp);
      } break;
      case 2:
      {
      img.Save(sav.FileName, ImageFormat.Jpeg);
      }
      break;


      Once you added this line in to ur code , it will give you a options of saving a file in Jpeg format

      Delete
  6. what password should i entered

    ReplyDelete
    Replies
    1. Whatever password u need, then u have to share the same password with the other person, then only they can able to extract information

      Delete
  7. How can i declare the Rijendal class? Eror is that "RijendalAlgo" does not exist.Plz give me the solution.

    ReplyDelete
  8. http://dotnetvisio.blogspot.in/2013/11/rijndael-symmetric-algorithm-encryption.html

    Above link have the implementation of rijndael algorithm, you have to change the key if you need

    ReplyDelete
  9. sir image is only saving in .png format please help

    ReplyDelete
    Replies
    1. This is an amazing blog,it gives very helpful messages to us.Besides that Wisen has established as Best Dot Net Training in Chennai. or learn thru ASP.NET Online Training . Nowadays Dot Net has tons of job opportunities on various vertical industry.

      Delete
  10. sir, may i know what technique you use for this steganography?

    ReplyDelete
  11. Plz upload the designer file too.

    ReplyDelete
  12. is it possible to make this application in web

    ReplyDelete
  13. Nice article.. sir do you have code in End of file steganography method ?
    What the method you use in above article ?

    ReplyDelete
  14. Nice article.. sir do you have code in End of file steganography method ?
    What the method you use in above article ?

    ReplyDelete
    Replies
    1. This is the full source code ................, this is consider as Pixel based calculations so you dont need end of file, width and height of a file and Pixel calculation , for each pixel we get the value of that pixel

      Delete
  15. sir "Code for Stegnography:" means what where we hv to write that code

    ReplyDelete
  16. sir plz tell me where to write so that i can run this program :) and make my project

    ReplyDelete
    Replies
    1. This application is written in Windows application

      Delete
  17. which method of steganography is used here ?

    ReplyDelete