public double CalculateFitness(string cipherText)
{
double fitness = 0;
SubstitutionCipher cipher = new SubstitutionCipher();
string decrypted = cipher.Decrypt(cipherText, Key);
//var trigramCounts = new FrequenciesCalculation();
var decrTrigramCounts = FrequenciesCalculation.getTrigramCounts(decrypted);
foreach (var trigram in decrTrigramCounts.Keys)
{
double defTrigramCount = FrequenciesCalculation.getCount(trigram);
if (defTrigramCount != 0)
{
fitness += decrTrigramCounts[trigram] * Math.Log(defTrigramCount, 2.0);
}
}
return(fitness);
}
public string DecodeByKey(string encriptedText)
{
SubstitutionCipher decoder = new SubstitutionCipher();
return(decoder.Decrypt(encriptedText, Key));
}
