public string RunCaesar(string cipherText)
{
sb.Clear();
sb.AppendLine("\n");
sb.AppendLine("// ########## ########## ########## //");
sb.AppendLine(" CAESAR SHIFT CIPHER");
sb.AppendLine("// ########## ########## ########## //");
sb.AppendLine();
sb.AppendLine("// ########## ########## ########## ########## ########## ########## ########## ########## //");
sb.AppendLine(FrequencyAnalysis.CalculatePrevStats(cipherText));
sb.AppendLine("// ########## ########## ########## ########## ########## ########## ########## ########## //");
sb.AppendLine();
// create a Frequency Analysis object
FrequencyAnalysis freqAnal = new FrequencyAnalysis();
freqAnal.AverageChange += (string text) => sb.AppendLine(text);
// iterate the possible shift caesars
sb.AppendLine("\n -- [ITERATE KEYS] --");
for (int i = 0; i < 26; i++)
{
string resultant = Ciphers.DecipherCaesar(cipherText, i);
freqAnal.AddOption(i.ToString(), resultant);
sb.AppendLine(string.Format("[OPTION:{0}]", i));
sb.AppendLine(resultant);
}
// nice friendly lil' header for console output...
sb.AppendLine("\n");
sb.AppendLine("// ########## ########## ########## //");
sb.AppendLine(" LOWEST FREQUENCY DIFFERENCE");
sb.AppendLine(" (most probable result)");
sb.AppendLine("// ########## ########## ########## //");
sb.AppendLine("");
sb.AppendLine(freqAnal.Solution());
sb.AppendLine(Ciphers.DecipherCaesar(cipherText, int.Parse(freqAnal.Solution())));
return(sb.ToString());
}
public string RunAffine(string cipherText)
{
sb.Clear();
sb.AppendLine("\n");
sb.AppendLine("// ########## ########## ########## //");
sb.AppendLine(" AFFINE CIPHER");
sb.AppendLine("// ########## ########## ########## //");
sb.AppendLine("");
// create a Frequency Analysis object
FrequencyAnalysis freqAnal = new FrequencyAnalysis();
freqAnal.AverageChange += (string text) => sb.AppendLine(text);
sb.AppendLine("// ########## ########## ########## ########## ########## ########## ########## ########## //");
sb.AppendLine(FrequencyAnalysis.CalculatePrevStats(cipherText));
sb.AppendLine("// ########## ########## ########## ########## ########## ########## ########## ########## //");
sb.AppendLine();
// iterate the possible shift caesars
sb.AppendLine("\n -- [ITERATE KEYS] --");
int[] coprimes = { 1, 3, 5, 7, 9, 11, 15, 17, 19, 21, 23, 25 }; // these are the possible values of a, as shown on the wiki
foreach (int var_a in coprimes)
{
for (int i = 0; i < 26; i++)
{
string resultant = Ciphers.DecipherAffine(cipherText, var_a, i);
freqAnal.AddOption(var_a.ToString() + "," + i.ToString(), resultant);
sb.AppendLine(string.Format("[OPTION:{0}:{1}]", var_a, i));
sb.AppendLine(resultant);
}
}
// nice friendly lil' header for console output...
sb.AppendLine("\n");
sb.AppendLine("// ########## ########## ########## //");
sb.AppendLine(" LOWEST FREQUENCY DIFFERENCE");
sb.AppendLine(" (most probable result)");
sb.AppendLine("// ########## ########## ########## //");
sb.AppendLine("");
string[] solution = freqAnal.Solution().Split(',');
sb.AppendLine(string.Format("AFFINE KEY BEST FIT: a={0}, b={1}\n", solution[0], solution[1]));
sb.AppendLine(Ciphers.DecipherAffine(cipherText, int.Parse(solution[0]), int.Parse(solution[1])));
return(sb.ToString());
}