public static bool stego(string txt, string fileName, string newFileName)
{
int noWords = WordDocument.noWords(fileName);
if (noWords - 1 < txt.Length * 8)
{
return(false);
}
List <bool> msg = txtToBinary(txt);
string coverString = WordDocument.returnDocument(fileName);
List <char> cover = coverString.ToList();
string stegoText = "";
int j = 0;
int k = 0;
do
{
char pref = cover[k++];
if (pref == ' ')
{
if (msg[j])
{
stegoText += pref + " ";
}
else
{
stegoText += pref;
}
j++;
}
else
{
stegoText += pref;
}
} while (k < cover.Count - 1 && j < msg.Count);
if (j < msg.Count)
{
if (msg[j])
{
stegoText += " ";
}
else
{
stegoText += " ";
}
}
if (k < cover.Count - 1)
{
stegoText += coverString.Substring(k);
}
WordDocument.createWord(stegoText, newFileName);
return(true);
}
public static Dictionary <char, int> stegoHuffman(string txt, string fileName, string newFileName)
{
List <bool> msg = new List <bool>();
HuffmanTree huffTree = new HuffmanTree();
txt += '\0';
huffTree.build(txt);
huffTree.Root.Traverse1();
List <bool> encoded = huffTree.encode(txt);
foreach (bool b in encoded)
{
msg.Add(b);
}
int noWords = WordDocument.noWords(fileName);
if (noWords - 1 < msg.Count)
{
return(null);
}
string coverString = WordDocument.returnDocument(fileName);
List <char> cover = coverString.ToCharArray().ToList();
string stegoText = "";
int j = 0;
int k = 0;
do
{
char pref = cover[k++];
if (pref == ' ')
{
if (msg[j])
{
stegoText += pref + " ";
}
else
{
stegoText += pref;
}
j++;
}
else
{
stegoText += pref;
}
} while (k < cover.Count - 1 && j < msg.Count);
if (j < msg.Count)
{
if (msg[j])
{
stegoText += " ";
}
else
{
stegoText += " ";
}
}
if (k < cover.Count - 1)
{
stegoText += coverString.Substring(k);
}
WordDocument.createWord(stegoText, newFileName);
return(huffTree.Frequencies);
}
public static string stegoCharRet(string fileName, int[] stegoKey, string[] compressKey, List <string> table)
{
string toRet = "";
List <char> lista = WordDocument.returnChars(fileName);
List <bool> binary = new List <bool>();
int end = 0;
int bajt = 0;
int i = 0;
List <int> key = stegoKey.ToList();
while (i + 4 < lista.Count)
{
int group = 0;
for (int j = 0; j < 4; j++)
{
int value = (int)lista[i + 1];
int n = key.IndexOf(value);
if (n < 0)
{
break;
}
for (int k = group; k < n; k++)
{
binary.Add(false);
group++;
end++;
bajt++;
}
if (group < 4)
{
binary.Add(true);
group++;
i++;
end = 0;
bajt++;
}
}
while (group < 4)
{
binary.Add(false);
group++;
end++;
bajt++;
}
i++;
if (table != null)
{
if (binary.Count >= table.Count * 2)
{
break;
}
}
else
{
if (end > 7 && bajt == 8)
{
break;
}
if (bajt == 8)
{
bajt = 0;
}
}
}
if (table != null)
{
binary = groupDecompress(binary, table, compressKey);
}
toRet = binaryToString(binary);
return(toRet);
}
static void Main(string[] args)
{
string tajnaPoruka = "ps";
string newFileName;
string newFileName1;
string fileName1 = "ravno.docx";
string fileName = Path.GetFullPath(fileName1);
string directory = Directory.GetCurrentDirectory();
WordDocument.clearSpaces(fileName);
while (true)
{
Console.WriteLine("\n");
Console.WriteLine("Tajna poruka je: " + tajnaPoruka);
Console.WriteLine("Unesite broj za zeljeni algoritam:");
Console.WriteLine("1 - Metoda blanko znakova kod poravnatog teksta");
Console.WriteLine("2 - Metoda blanko znakova kod neporavnatog teksta");
Console.WriteLine("3 - ZWC metoda");
Console.WriteLine("4 - Metoda koriscenja nevidljivih simbola");
Console.WriteLine("5 - Metoda sa Hafmanovom kompresijom");
Console.WriteLine("6 - Metoda sa enkripcijom");
Console.WriteLine("7 - Promenite tajnu poruku");
Console.WriteLine("q - kraj");
string alg = Console.ReadLine();
//1. algoritam - metoda blanko znakova kod poravnatog teksta
if (alg == "1")
{
newFileName1 = "stego1.docx";
newFileName = Path.Combine(directory, newFileName1);
if (OpenSpace.stegoJustification(tajnaPoruka, fileName, newFileName))
{
Console.WriteLine("Stego fajl je kreiran.");
Console.WriteLine("Poruka iz stego fajla je: " + OpenSpace.stegoJustificationRet(newFileName));
}
else
{
Console.WriteLine("Predugacka poruka!");
}
}
//2. algoritam - metoda blanko znakova kod neporavnatog teksta
else if (alg == "2")
{
newFileName1 = "stego2.docx";
newFileName = Path.Combine(directory, newFileName1);
if (OpenSpace.stego(tajnaPoruka, fileName, newFileName))
{
Console.WriteLine("Stego fajl je kreiran.");
Console.WriteLine("Poruka iz stego fajla je: " + OpenSpace.stegoRet(newFileName));
}
else
{
Console.WriteLine("Predugacka poruka!");
}
}
//3. algoritam - ZWC metoda
else if (alg == "3")
{
newFileName1 = "stego3.docx";
newFileName = Path.Combine(directory, newFileName1);
if (OpenSpace.stegoZWC(tajnaPoruka, fileName, newFileName))
{
Console.WriteLine("Stego fajl je kreiran.");
Console.WriteLine("Poruka iz stego fajla je: " + OpenSpace.stegoZWCret(newFileName));
}
else
{
Console.WriteLine("Predugacka poruka!");
}
}
//4. algoritam - Metoda koriscenja nevidljivih simbola
else if (alg == "4")
{
newFileName1 = "stego4.docx";
newFileName = Path.Combine(directory, newFileName1);
int[] stegoKey = { 8207, 8206, 8205, 8204 };
if (OpenSpace.stegoChar(tajnaPoruka, fileName, newFileName, stegoKey, null))
{
Console.WriteLine("Stego fajl je kreiran.");
Console.WriteLine("Poruka iz stego fajla je: " + OpenSpace.stegoCharRet(newFileName, stegoKey, null, null));
}
else
{
Console.WriteLine("Predugacka poruka!");
}
}
//5. algoritam - Metoda sa Hafmanovom kompresijom
else if (alg == "5")
{
newFileName1 = "stego5.docx";
newFileName = Path.Combine(directory, newFileName1);
Dictionary <char, int> freq = OpenSpace.stegoHuffman(tajnaPoruka, fileName, newFileName);
if (freq != null)
{
Console.WriteLine("Stego fajl je kreiran.");
Console.WriteLine("Poruka iz stego fajla je: " + OpenSpace.stegoHuffmanRet(newFileName, freq));
}
else
{
Console.WriteLine("Predugacka poruka!");
}
}
// 6. algoritam - Metoda sa enkripcijom
else if (alg == "6")
{
newFileName1 = "stego6.docx";
newFileName = Path.Combine(directory, newFileName1);
List <string> table;
string[] compressKey = { "G1", "G2", "G3", "G4" };
byte[] iv;
byte[] key;
int[] stegoKey = { 8207, 8206, 8205, 8204 };
bool ok = OpenSpace.stegoEncryption(tajnaPoruka, fileName, newFileName, out iv, out key, stegoKey, compressKey, out table);
if (ok)
{
Console.WriteLine("Stego fajl je kreiran.");
Console.WriteLine("Poruka iz stego fajla je: " + OpenSpace.stegoEncryptionRet(newFileName, iv, key, stegoKey, compressKey, table));
}
else
{
Console.WriteLine("Predugacka poruka!");
}
}
else if (alg == "7")
{
Console.WriteLine("Unesite poruku: ");
tajnaPoruka = Console.ReadLine();
}
else if (alg == "q")
{
break;
}
}
}
