public void Execute()
{
this.genAttacker = new GeneticAttacker();
this.dicAttacker = new DictionaryAttacker();
String alpha = "";
Boolean inputOK = true;
// Clear presentation
((AssignmentPresentation)Presentation).Dispatcher.Invoke(DispatcherPriority.Normal, (SendOrPostCallback) delegate
{
((AssignmentPresentation)Presentation).entries.Clear();
}, null);
// Prepare the cryptanalysis of the ciphertext
// Set alphabet
alpha = detAlphabet(settings.Alphabet);
this.ptAlphabet = new Alphabet(alpha, 1, settings.Alphabet);
this.ctAlphabet = new Alphabet(alpha, 1, settings.Alphabet);
// N-gram probabilities
String helper = IdentifyNGramFile(settings.Alphabet);
if (helper != null)
{
this.langFreq = new Frequencies(this.ptAlphabet);
this.langFreq.ReadProbabilitiesFromNGramFile(helper);
}
else
{
GuiLogMessage(Resources.no_ngram_file, NotificationLevel.Error);
}
// Dictionary
if (settings.Alphabet == 0)
{
try
{
this.langDic = new Dictionary("en-small.dic", ctAlphabet.Length);
}
catch (Exception ex)
{
GuiLogMessage(Resources.error_dictionary + " :" + ex.Message, NotificationLevel.Error);
}
}
else if (settings.Alphabet == 1)
{
try
{
this.langDic = new Dictionary("de-small.dic", ctAlphabet.Length);
}
catch (Exception ex)
{
GuiLogMessage(Resources.error_dictionary + " :" + ex.Message, NotificationLevel.Error);
}
}
// Add new case for another language
// elseif (settings.Alphabet == 1)
// {
// ......
// }
// Set ciphertext
String helper1 = null;
try
{
//helper1 = returnStreamContent(this.ciphertext);
if (this.ciphertext.Length != 0)
{
helper1 = this.ciphertext;
}
}
catch
{
GuiLogMessage(Resources.error_ciphertext, NotificationLevel.Error);
}
if (helper1 != null)
{
this.cText = new Text(helper1, this.ctAlphabet, settings.TreatmentInvalidChars);
}
else
{
this.cText = null;
}
// PTAlphabet correct?
if (this.ptAlphabet == null)
{
GuiLogMessage(Resources.no_plaintext_alphabet, NotificationLevel.Error);
inputOK = false;
}
// CTAlphabet correct?
if (this.ctAlphabet == null)
{
GuiLogMessage(Resources.no_ciphertext_alphabet, NotificationLevel.Error);
inputOK = false;
}
// Ciphertext correct?
if (this.cText == null)
{
GuiLogMessage(Resources.no_ciphertext, NotificationLevel.Error);
inputOK = false;
}
// Dictionary correct?
if (this.langDic == null)
{
GuiLogMessage(Resources.no_dictionary, NotificationLevel.Warning);
}
// Language frequencies
if (this.langFreq == null)
{
GuiLogMessage(Resources.no_lang_freq, NotificationLevel.Error);
inputOK = false;
}
// Check length of ciphertext and plaintext alphabet
if (this.ctAlphabet.Length != this.ptAlphabet.Length)
{
GuiLogMessage(Resources.error_alphabet_length, NotificationLevel.Error);
inputOK = false;
}
// If input incorrect return otherwise execute analysis
lock (this.stopFlag)
{
if (this.stopFlag.Stop == true)
{
return;
}
}
if (inputOK == false)
{
inputOK = true;
return;
}
else
{
this.UpdateDisplayStart();
//this.masPresentation.DisableGUI();
this.masPresentation.UpdateOutputFromUserChoice = this.UpdateOutput;
this.keyCandidates = new List <KeyCandidate>();
if (this.langDic == null)
{
AnalyzeGenetic();
}
else
{
AnalyzeDictionary();
AnalyzeGenetic();
}
//this.masPresentation.EnableGUI();
this.UpdateDisplayEnd();
}
//set final plugin progress to 100%:
OnPluginProgressChanged(this, new PluginProgressEventArgs(1.0, 1.0));
}
private void CreateInitialGeneration(Population pop, Text ciphertext, Alphabet cipher_alpha, Alphabet plain_alpha, Frequencies freq)
{
// Create initial population keys
int[] newkey;
int keylength = cipher_alpha.Length;
// Create the other population keys at random
for (int i = 0; i < pop.keys.Length; i++)
{
newkey = this.CreateInitialKeyRandom(keylength);
while (this.banlist.Contains(newkey))
{
newkey = this.CreateInitialKeyRandom(keylength);
}
this.banlist.Add(newkey);
pop.keys[i] = newkey;
}
// Calculate fitness of population keys
for (int i = 0; i < pop.keys.Length; i++)
{
pop.fitness[i] = this.language_frequencies.CalculateFitnessOfKey(DecryptCiphertext(pop.keys[i], ciphertext, cipher_alpha));
}
// Sort keys according to their fitness
int[] helper1;
double helper2;
for (int i = 0; i < pop.keys.Length; i++)
{
for (int j = 0; j < pop.keys.Length; j++)
{
if (pop.fitness[i] > pop.fitness[j])
{
helper1 = pop.keys[i];
pop.keys[i] = pop.keys[j];
pop.keys[j] = helper1;
helper2 = pop.fitness[i];
pop.fitness[i] = pop.fitness[j];
pop.fitness[j] = helper2;
}
}
}
// Calculate change in development
pop.fit_lastbestkey = pop.fitness[0];
pop.dev = Math.Abs(pop.fitness[0]);
}
