LSB algorithm, steganography project

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I have encoded a message in the lsb of each pixel. How would i retrieve it? When i read the LSB of each pixel do input each bit into a byte array or a zero/one into a char array? Unsure what encoding function to call then? I should use a foreach loop and Encoding.UTF8.GetString(Message)but all the ones and zeros from the char array into a single string?

I have just modified my code. The message i pull form the image i put into a
stringbuilder object consist of ones and zeros. After the indexed for loops, one can see i have tried various methods but the same value is returned, any suggestions

C#

private void button2_Click(object sender, EventArgs e)
        {
            int c = sb.Length,x,y,z=0;
            char[] Message= new char[c];
            StringBuilder RetreivedMessage = new StringBuilder();
            for (x = 0, y = 0; x < image1.Width && z < c; x++)
            {
                for (y = 0; y < image1.Height && z < c; y++)
                {
                    Color pixelColor = image1.GetPixel(x, y);
                    string binary1 = Convert.ToString(pixelColor.R, 2);
                    //byte NewRed, NewGreen, NewBlue;
                    if (binary1[binary1.Length -1] == '0')
                    {
                        RetreivedMessage.Append('0');
                        z++;
                        if (z == c)
                        {
                            break;
                        }

                    }
                    else
                    {
                        RetreivedMessage.Append('1');
                        z++;
                        if (z == c)
                        {
                            break;
                        }

                    }
                    binary1 = Convert.ToString(pixelColor.G, 2);
                    //byte NewRed, NewGreen, NewBlue;
                    if (binary1[binary1.Length - 1] == '0')
                    {
                        RetreivedMessage.Append('0');
                        z++;
                        if (z == c)
                        {
                            break;
                        }

                    }
                    else
                    {
                        RetreivedMessage.Append('1');
                        z++;
                        if (z == c)
                        {
                            break;
                        }

                    }
                    binary1 = Convert.ToString(pixelColor.B, 2);
                    //byte NewRed, NewGreen, NewBlue;
                    if (binary1[binary1.Length - 1] == '0')
                    {
                        RetreivedMessage.Append('0');
                        z++;
                        if (z == c)
                        {
                            break;
                        }

                    }
                    else
                    {
                        RetreivedMessage.Append('1');
                        z++;
                        if (z == c)
                        {
                            break;
                        }

                    }
                    //string binary1 = Convert.ToString(pixelColor.R, 2);
                    //char last1 = binary1[binary1.Length - 1];
                }
            }
            string FinalRetreivedMessage  = RetreivedMessage.ToString();
            //Byte[] buf = Encoding.Unicode.GetBytes(RetreivedMessage.ToString());
            Byte[] buf = Encoding.Unicode.GetBytes(RetreivedMessage.ToString());
            string result = System.Text.Encoding.Unicode.GetString(buf);
            //String result = Encoding.Unicode.GetString(buf);
            StringBuilder r2 = new StringBuilder();
            //foreach (Byte b in Encoding.Unicode.GetBytes(FinalRetreivedMessage))
           // {
           //    r2.Append(Convert.ToString());
            //}
        }

Posted 18-Nov-12 0:22am

Darith1974

Updated 19-Nov-12 1:21am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v3

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Comments

Christian Graus 18-Nov-12 15:53pm

You reverse the process you used to put it in there, surely ?

Darith1974 21-Nov-12 5:07am

string a ="te";
StringBuilder r2 = new StringBuilder();
foreach (Byte b in Encoding.Unicode.GetBytes(a))
{
r2.Append(Convert.ToString(b,2));
}

Thanks your reply has substance in that i used the above code to create the initial string so i should look at this code to solve my challenge

2 solutions

Solution 2

string FinalRetreivedMessage  = RetreivedMessage.ToString();
            int count = FinalRetreivedMessage.Length / 8;
            System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
            UTF8Encoding enc = new UTF8Encoding();
            var StringBytes = new byte[count];
            for (int i = 0; i < count; i++)
                StringBytes[i] = Convert.ToByte(FinalRetreivedMessage.Substring(i * 8, 8), 2);
                //StringBytes[i] = encoding.GetBytes(FinalRetreivedMessage.Substring(i * 8, 8), 2);
            string FinalResult = enc.GetString(StringBytes);

Posted 6-Dec-12 6:06am

Darith1974

Comments

Gbolahan OIladele Taiwo 10-May-16 0:16am

Hello Hamzeh Soboh. I downloaded your code on steganography (c#) to guide me to development mine for my project yet i'm trying to run it. How do i run your code?

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Darith1974 · Accepted Answer · 2012-11-23T01:03:00

string FinalRetreivedMessage  = RetreivedMessage.ToString();
            int count = FinalRetreivedMessage.Length / 8;
            System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
            UTF8Encoding enc = new UTF8Encoding();
            var StringBytes = new byte[count];
            for (int i = 0; i < count; i++)
                StringBytes[i] = Convert.ToByte(FinalRetreivedMessage.Substring(i * 8, 8), 2);
                //StringBytes[i] = encoding.GetBytes(FinalRetreivedMessage.Substring(i * 8, 8), 2);
            string FinalResult = enc.GetString(StringBytes);