public string Decrypt(string cipherText)
{
int[] num = new int[Key.Length];
int[] back = new int[Key.Length];
string[] columns = new string[Key.Length];
int minNum;
StringBuilder output = new StringBuilder();
minNum = cipherText.Length / Key.Length;
KeyIndexer key = new KeyIndexer();
for (int i = 0; i < Key.Length; i++)
{
for (int j = 0; j < alphabet.Length; j++)
{
if (Key[i] == alphabet[j])
{
key.Add(i, j);
}
}
}
key.ReindexValues();
for (int i = 0; i < num.Length; i++)
{
num[i] = minNum;
back[key[i]] = i;
}
int k = 0;
for (int j = minNum * Key.Length; j < cipherText.Length; j++)
{
num[key[k++]]++;
}
for (int i = 0; i < Key.Length; i++)
{
columns[back[i]] = cipherText.Substring(0, num[i]);
cipherText = cipherText.Substring(num[i], cipherText.Length - num[i]);
}
for (int i = 0; i < minNum + 1; i++)
{
for (int j = 0; j < columns.Length; j++)
{
if (columns[j].Length > i)
{
output.Append(columns[j][i]);
}
}
}
return output.ToString();
//StringBuilder output = new StringBuilder(cipherText.ToUpper());
//StringBuilder descramble = new StringBuilder(cipherText.ToUpper());
//Dictionary<int, int> temp = new Dictionary<int, int>();
//for (int i = 0; i < Key.Length; i++)
//{
// for (int j = 0; j < alphabet.Length; j++)
// {
// if (Key[i] == alphabet[j])
// {
// temp.Add(j, i);
// }
// }
//}
//List<int> locations = new List<int>(temp.Keys);
//locations.Sort();
//Dictionary<int, int> indices = new Dictionary<int, int>();
//for (int i = 0; i < locations.Count; i++)
//{
// indices.Add(i, temp[locations[i]]);
//}
//int rows = output.Length / Key.Length;
//if (output.Length % Key.Length != 0)
//{
// rows++;
//}
//int k = 0;
//for (int j = 0; j < rows; j++)
//{
// for (int i = j; i < output.Length; i += rows)
// {
// descramble[k++] = cipherText[i];
// }
//}
//k = 0;
//for (int j = 0; j < Key.Length; j++)
//{
// for (int i = 0; i < output.Length; i += Key.Length)
// {
// if (i + indices[j] < output.Length && i + j < output.Length)
// {
// output[i + indices[j]] = descramble[j + i];
// }
// }
//}
//return output.ToString();
}
public string Decrypt(string cipherText)
{
int[] num = new int[Key.Length];
int[] back = new int[Key.Length];
string[] columns = new string[Key.Length];
int minNum;
StringBuilder output = new StringBuilder();
minNum = cipherText.Length / Key.Length;
KeyIndexer key = new KeyIndexer();
for (int i = 0; i < Key.Length; i++)
{
for (int j = 0; j < alphabet.Length; j++)
{
if (Key[i] == alphabet[j])
{
key.Add(i, j);
}
}
}
key.ReindexValues();
for (int i = 0; i < num.Length; i++)
{
num[i] = minNum;
back[key[i]] = i;
}
int k = 0;
for (int j = minNum * Key.Length; j < cipherText.Length; j++)
{
num[key[k++]]++;
}
for (int i = 0; i < Key.Length; i++)
{
columns[back[i]] = cipherText.Substring(0, num[i]);
cipherText = cipherText.Substring(num[i], cipherText.Length - num[i]);
}
for (int i = 0; i < minNum + 1; i++)
{
for (int j = 0; j < columns.Length; j++)
{
if (columns[j].Length > i)
{
output.Append(columns[j][i]);
}
}
}
return(output.ToString());
//StringBuilder output = new StringBuilder(cipherText.ToUpper());
//StringBuilder descramble = new StringBuilder(cipherText.ToUpper());
//Dictionary<int, int> temp = new Dictionary<int, int>();
//for (int i = 0; i < Key.Length; i++)
//{
// for (int j = 0; j < alphabet.Length; j++)
// {
// if (Key[i] == alphabet[j])
// {
// temp.Add(j, i);
// }
// }
//}
//List<int> locations = new List<int>(temp.Keys);
//locations.Sort();
//Dictionary<int, int> indices = new Dictionary<int, int>();
//for (int i = 0; i < locations.Count; i++)
//{
// indices.Add(i, temp[locations[i]]);
//}
//int rows = output.Length / Key.Length;
//if (output.Length % Key.Length != 0)
//{
// rows++;
//}
//int k = 0;
//for (int j = 0; j < rows; j++)
//{
// for (int i = j; i < output.Length; i += rows)
// {
// descramble[k++] = cipherText[i];
// }
//}
//k = 0;
//for (int j = 0; j < Key.Length; j++)
//{
// for (int i = 0; i < output.Length; i += Key.Length)
// {
// if (i + indices[j] < output.Length && i + j < output.Length)
// {
// output[i + indices[j]] = descramble[j + i];
// }
// }
//}
//return output.ToString();
}