public Bitmap Encode(RichTextBox Ciphertext, PictureBox Stego_Image, Button SaveStego)
{
Bitmap new_image = new Bitmap(Image_Processing);;
if (Key != "")
{
//1. Encryption Part
int[] Plain_index = Convert_String_to_IntArray(Plaintext);
//Console.WriteLine("===Plaintext in ASCII===");
//Printarray(Plain_index);
int[] Key_index = Convert_String_to_IntArray(Key);
//Console.WriteLine("\n===Key in ASCII===");
//Printarray(Key_index);
int[] Key_Stream = Get_KeyStream(Plain_index.Length, Key_index);
int IV = Setting[3];
int Shift_Bit = Setting[2];
int[] Temp = Encryption(Plain_index, Key_Stream, Setting[3], Shift_Bit);
//Console.WriteLine("\n===Ciphertext in ASCII===");
//Printarray(Temp);
Ciphertext.Text = Convert_IntArray_to_String(Temp);
//2. Pixel Random Part
int Width = Image_Processing.Width;
int Height = Image_Processing.Height;
int A = 1;
int C = Setting[0];
int M = Width * Height;
int Seed = Setting[1];
int Piksel_needed = Temp.Length * 2;
Controller_LCG LCG = new Controller_LCG(Width, Height);
int[,] Pixel_Random = LCG.Get_Pixel_Random(A, C, M, Seed, Piksel_needed);
//PrintArray2d(Pixel_Random);
//
//3. Part Encoding
int Counter_Text = 0;
int Counter_Row1 = 0;
int Counter_Row2 = 1;
int x1, y1, x2, y2;
int r1, g1, b1, a1, r2, g2, b2, a2;
while (Counter_Row1 < Piksel_needed)
{
x1 = Pixel_Random[Counter_Row1, 0];
y1 = Pixel_Random[Counter_Row1, 1];
x2 = Pixel_Random[Counter_Row2, 0];
y2 = Pixel_Random[Counter_Row2, 1];
Color p = this.Image_Processing.GetPixel(x1, y1);
Color p2 = this.Image_Processing.GetPixel(x2, y2);
a1 = p.A;
r1 = p.R;
g1 = p.G;
b1 = p.B;
a2 = p2.A;
r2 = p2.R;
g2 = p2.G;
b2 = p2.B;
//Console.WriteLine("Pixel1 = " + a1 + "," + r1 + "," + g1 + "," + b1);
//Console.WriteLine("Pixel1 = " + a2 + "," + r2 + "," + g2 + "," + b2);
int[] bytes = Decimal_to_Binary(Temp[Counter_Text]);
int bit0 = bytes[0];
int bit1 = bytes[1];
int bit2 = bytes[2];
int bit3 = bytes[3];
int bit4 = bytes[4];
int bit5 = bytes[5];
int bit6 = bytes[6];
int bit7 = bytes[7];
//Console.WriteLine("Index-" + Counter_Text + " = " + bit0 + "," + bit1 + "," + bit2 + "," + bit3 + "," + bit4 + "," + bit5 + "," + bit6 +","+bit7);
a1 = GetLSB(a1, bit0);
r1 = GetLSB(r1, bit1);
g1 = GetLSB(g1, bit2);
b1 = GetLSB(b1, bit3);
a2 = GetLSB(a2, bit4);
r2 = GetLSB(r2, bit5);
g2 = GetLSB(g2, bit6);
b2 = GetLSB(b2, bit7);
//Console.WriteLine("New Image = " + a1 + "," + r1 + "," + g1 + "," + b1+ ", "+ a2 + "," + r2 + "," + g2 + "," + b2);
new_image.SetPixel(x1, y1, Color.FromArgb(a1, r1, g1, b1));
new_image.SetPixel(x2, y2, Color.FromArgb(a2, r2, g2, b2));
//Color p3 = new_image.GetPixel(x1, y1);
//Color p4 = new_image.GetPixel(x2, y2);
//Console.WriteLine("New Image = " + p3.A + "," + p3.R + "," + p3.G + "," + p3.B + ", " + p4.A + "," + p4.R + "," + p4.G + "," + p4.B);
Counter_Text += 1;
Counter_Row1 += 2;
Counter_Row2 += 2;
}
Stego_Image.Image = new_image;
SaveStego.Enabled = true;
MessageBox.Show("Done", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
SaveStego.Enabled = false;
MessageBox.Show("Key Is Empty", "Stop", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
return(new_image);
}
public void Decode(RichTextBox Ciphertext, RichTextBox Plaintext, Button SaveText)
{
if (Key != "")
{
//1. Get Pixel Random First
int Width = Stego.Width;
int Height = Stego.Height;
int A = 1;
int C = Setting[0];
int M = Width * Height;
int Seed = Setting[1];
int Piksel_needed = NCharacter * 2;
Controller_LCG LCG = new Controller_LCG(Width, Height);
int[,] Pixel_Random = LCG.Get_Pixel_Random(A, C, M, Seed, Piksel_needed);
//2. Part Decode
int Counter_Text = 0;
int Counter_Row1 = 0;
int Counter_Row2 = 1;
int x1, y1, x2, y2;
int r1, g1, b1, a1, r2, g2, b2, a2;
int[] Plain_Index = new int[NCharacter];
while (Counter_Row1 < Piksel_needed)
{
x1 = Pixel_Random[Counter_Row1, 0];
y1 = Pixel_Random[Counter_Row1, 1];
x2 = Pixel_Random[Counter_Row2, 0];
y2 = Pixel_Random[Counter_Row2, 1];
Color p = this.Stego.GetPixel(x1, y1);
Color p2 = this.Stego.GetPixel(x2, y2);
a1 = p.A;
r1 = p.R;
g1 = p.G;
b1 = p.B;
a2 = p2.A;
r2 = p2.R;
g2 = p2.G;
b2 = p2.B;
//Console.WriteLine("Pixel1 = " + a1 + "," + r1 + "," + g1 + "," + b1);
//Console.WriteLine("Pixel2 = " + a2 + "," + r2 + "," + g2 + "," + b2);
int[] bytes = new int[8];
bytes[0] = GetLSB2(a1);
bytes[1] = GetLSB2(r1);
bytes[2] = GetLSB2(g1);
bytes[3] = GetLSB2(b1);
bytes[4] = GetLSB2(a2);
bytes[5] = GetLSB2(r2);
bytes[6] = GetLSB2(g2);
bytes[7] = GetLSB2(b2);
Plain_Index[Counter_Text] = Binary_to_Decimal(bytes);
// Console.WriteLine("Index-" + Counter_Text + " = " + Binary_to_Decimal(bytes));
Counter_Text += 1;
Counter_Row1 += 2;
Counter_Row2 += 2;
}
Ciphertext.Text = Convert_IntArray_to_String(Plain_Index);
int[] Key_Index = Convert_String_to_IntArray(Key);
int IV = Setting[3];
int shift_bit = Setting[2];
int[] Key_Stream = Get_KeyStream(Plain_Index.Length, Key_Index);
int[] Temp2 = Decryption(Plain_Index, Key_Stream, IV, shift_bit);
string plain = Convert_IntArray_to_String(Temp2);
Plaintext.Text = plain;
SaveText.Enabled = true;
MessageBox.Show("Done", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
SaveText.Enabled = false;
MessageBox.Show("Key Is Empty", "Stop", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
}