public void FixKey(string post)
{
var pre = VigenereDecrypter.TextOnlyLetters;
var postOnlyLetters = new string(post.Where(Char.IsLetter).ToArray());
var ind = -1;
for (var i = 0; i < Math.Min(pre.Length, postOnlyLetters.Length); i++)
{
if (pre[i] == postOnlyLetters[i])
{
continue;
}
ind = i;
break;
}
var k = ind % Mu;
var keychar = VigenereDecrypter.Decrypt(VigenereDecrypter.Key[k],
VigenereDecrypter.Decrypt(postOnlyLetters[ind], pre[ind]));
VigenereDecrypter.Key =
new string(VigenereDecrypter.Key.Select((c, i) => i == k ? keychar : c).ToArray());
}
public void SuggestMostOccuring(int index, char letter)
{
var most = Enumerable.Range(0, VigenereDecrypter.CipherTextOnlyLetters.Length / Mu)
.Select(i => VigenereDecrypter.CipherTextOnlyLetters.Substring(i * Mu, Mu))
.Select(i => i[index])
.Aggregate(new Dictionary <char, int>(),
(charcouner, c) =>
{
charcouner[c] = charcouner.ContainsKey(c) ? charcouner[c] + 1 : 1;
return(charcouner);
})
.OrderByDescending(pair => pair.Value)
.First()
.Key;
var keychar = VigenereDecrypter.Decrypt(most, letter);
VigenereDecrypter.Key =
new string(VigenereDecrypter.Key.Select((c, i) => i == index ? keychar : c).ToArray());
}