public string Analyze()
{
for (int a = 1; a < M; a++)
{
if (SimpleMaths.GCD(a, M) != 1)
{
continue;
}
for (int b = 0; b < M; b++)
{
AffineCipher affine = new AffineCipher(a, b);
string text = affine.DecryptText(cipherText);
double score = NgramStatistics.CountTextScore(text);
if (score > rate)
{
rate = score;
this.decryptedText = text;
}
}
}
return(decryptedText);
}
static void OpenMode(Mode mode)
{
using (StreamReader inReader = new StreamReader("in.txt"))
{
string openText = inReader.ReadLine();
using (StreamReader keyReader = new StreamReader(mode.ToString() + "\\" + "key.txt"))
{
IEncoder encoder;
try
{
switch (mode)
{
case Mode.Affine:
int a, b;
ReadAffineKeys(keyReader, out a, out b);
encoder = new AffineCipher(a, b);
break;
case Mode.Simple:
Dictionary <char, char> alphabet = ReadTable(keyReader);
encoder = new SimpleSubstitutionCipher(alphabet);
break;
default:
string keyWord = ReadKeyWord(keyReader);
encoder = new VigenereCipher(keyWord);
break;
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return;
}
string cipher = encoder.EncryptText(openText);
using (StreamWriter cryptWriter = new StreamWriter(mode.ToString() + "\\" + "crypt.txt"))
{
cryptWriter.WriteLine(cipher);
}
string decryptText = encoder.DecryptText(cipher);
using (StreamWriter decryptWriter = new StreamWriter(mode.ToString() + "\\" + "decrypt.txt"))
{
decryptWriter.WriteLine(decryptText);
}
}
}
}
