397 Description: This is a simple decoder program I wrote (very buggy though; certainly not perfect) that allows you to input encoded plain text according to my garf method, and reveals a sequences of numbers. If the text is actually encoded, it wil

Form1.cs

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.Reflection;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private string ValuesToString(int[] values)
        {
            string nums = "";

            for (int i = 0; i < values.Length; i++)
            {
                nums += values[i].ToString() + " ";
            }

            return nums;
        }


        private void theText_TextChanged(object sender, EventArgs e)
        {
            PrimaryStegLayer layer = new PrimaryStegLayer(theText.Text, 3);
            int[] values = layer.Values;

            string nums = "";
            nums += ValuesToString(values) + "\r\n\r\n";

            SecondaryStegLayer layer2 = new SecondaryStegLayer(layer);

            nums += ValuesToString(layer2.Values) + "\r\n\r\n";

            ThirdStegLayer layer3 = new ThirdStegLayer(layer2, false);

            nums += ValuesToString(layer3.Values) + "\r\n\r\n";

            GarfScanner stuff = new GarfScanner(layer3.Values);

            nums += ValuesToString(stuff.Values) + "\r\n\r\n";

            theCode.Text = nums;

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Assembly a = Assembly.GetExecutingAssembly();
            Stream s = a.GetManifestResourceStream("WindowsFormsApplication1.Key.txt");
            StreamReader sr = new StreamReader(s);

            theKey.Text = sr.ReadToEnd();

            sr.Close();
            s.Close();
        }
    }
}

Form1.Designer.cs

namespace WindowsFormsApplication1
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.theText = new System.Windows.Forms.RichTextBox();
            this.theCode = new System.Windows.Forms.RichTextBox();
            this.theKey = new System.Windows.Forms.RichTextBox();
            this.SuspendLayout();
            // 
            // theText
            // 
            this.theText.Location = new System.Drawing.Point(195, 7);
            this.theText.Name = "theText";
            this.theText.Size = new System.Drawing.Size(442, 96);
            this.theText.TabIndex = 0;
            this.theText.Text = "";
            this.theText.TextChanged += new System.EventHandler(this.theText_TextChanged);
            // 
            // theCode
            // 
            this.theCode.Location = new System.Drawing.Point(195, 109);
            this.theCode.Name = "theCode";
            this.theCode.Size = new System.Drawing.Size(442, 137);
            this.theCode.TabIndex = 1;
            this.theCode.Text = "";
            // 
            // theKey
            // 
            this.theKey.Location = new System.Drawing.Point(12, 12);
            this.theKey.Name = "theKey";
            this.theKey.ReadOnly = true;
            this.theKey.Size = new System.Drawing.Size(177, 234);
            this.theKey.TabIndex = 2;
            this.theKey.Text = "";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(644, 252);
            this.Controls.Add(this.theKey);
            this.Controls.Add(this.theCode);
            this.Controls.Add(this.theText);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.RichTextBox theText;
        private System.Windows.Forms.RichTextBox theCode;
        private System.Windows.Forms.RichTextBox theKey;
    }
}

Key.txt

A = 0
B = 1
C = 2
D = 3

E = 0
F = 1
G = 2
H = 3

I = 0
J = 1
K = 2
L = 3

M = 0
N = 1
O = 2
P = 3

Q = 0
R = 1
S = 2
T = 3

U = 0
V = 1
W = 2
X = 3

Y = 0
Z = 1

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}

StegCoding.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WindowsFormsApplication1
{
    class StegCoding
    {
    }

    class PrimaryStegLayer : List<int>
    {
        private int[] values = null;
 
        public PrimaryStegLayer(string codedString, int max)
        {
            string str = codedString.ToLower();
            string[] words  = str.Split(new String[] {" ", ",", "?", ".", "!"},
                                        StringSplitOptions.RemoveEmptyEntries);

            for (int i = 0; i < words.Length; i++)
            {
                byte firstByteValue = (byte) words[i][0];
                byte alphabetStart = (byte)"a"[0];
                int value = (firstByteValue - alphabetStart) % (max + 1);

                this.Add(value);
            }

            values = this.ToArray();
        }

        public int[] Values
        {
            get { return values; }
        }
    }

    class SecondaryStegLayer : List<int>
    {
        public SecondaryStegLayer(int[] primaryValues)
        {
            ConstructFromArray(primaryValues);
        }

        public SecondaryStegLayer(PrimaryStegLayer primaryStegLayer)
        {
            ConstructFromArray(primaryStegLayer.Values);
        }

        private int[] values = null;

        private void ConstructFromArray(int[] primaryValues)
        {
            int pl = primaryValues.Length;

            for (int i = 0; i < pl / 2 + pl % 2; i++)
            {
                int ci = 2 * i;

                if (ci + 1 < pl)
                {
                    this.Add(primaryValues[ci] + primaryValues[ci+1]);
                }
                else
                {
                    this.Add(primaryValues[ci]);
                }
            }

            values = this.ToArray();
        }

        public int[] Values
        {
            get
            {
                return values;
            }
        }
    }

    class ThirdStegLayer : List<int>
    {
        private int[] values = null;

        public ThirdStegLayer(int[] secondaryValues, bool signDifferences)
        {
            ConstructFromArray(secondaryValues, signDifferences);
        }

        public ThirdStegLayer(SecondaryStegLayer secondaryStegLayer, bool signDifferences)
        {
            ConstructFromArray(secondaryStegLayer.Values, signDifferences);
        }

        private void ConstructFromArray(int[] secondaryValues, bool signDifferences)
        {
            int vl = secondaryValues.Length;

            for (int i = 1; i < vl; i++)
            {
                int v = secondaryValues[i - 1] - secondaryValues[i];
                if (!signDifferences) v = Math.Abs(v);

                this.Add(v);
            }

            values = this.ToArray();
        }

        public int[] Values
        {
            get
            {
                return values;
            }
        }
    }

    class GarfScanner : List<int>
    {
        int index = 0;

        int[] _sequence = null;

        int[] values = null;

        public GarfScanner(int[] sequence)
        {
            _sequence = new int[sequence.Length];

            sequence.CopyTo(_sequence, 0);

            while (SegmentsLeft())
            {
                int sv = Math.Abs(ProcessSegment());
                this.Add(sv);
            }

            values = this.ToArray();
        }

        public int[] Values
        {
            get
            {
                return values;
            }
        }

        private bool SegmentsLeft()
        {
            return index < _sequence.Length;
        }

        private int ProcessSegment()
        {
            int[] segmentNums = ReadSegment();
            int l = segmentNums.Length;

            if (l == 0) return 0;
            if (l == 1) return segmentNums[0];
            if (l == 2) return segmentNums[0] + segmentNums[1];

            int result = 1;
            int mode = segmentNums[0];

            for (int i = 1; i < l - 1; i++)
            {
                result *= segmentNums[i];
            }

            switch (mode)
            {
                case 1:
                    result *= segmentNums[l-1];
                    break;
                case 2:
                    result += segmentNums[l-1];
                    break;
                case 3:
                    result -= segmentNums[l-1];
                    break;
            }

            return result;
        }

        private int[] ReadSegment()
        {
            int l = _sequence.Length;
            int i = 0;
            List<int> segmentNums = new List<int>();

            while (_sequence[index + i] != 0)
            {
                int num = _sequence[index + i];

                segmentNums.Add(num);

                i++;

                if (index + i == l) break;
            }

            i++;

            index += i;

            return segmentNums.ToArray();
        }
    }
}