static bool IsComparable(string baseFre, string currentFre)
{
if (string.IsNullOrEmpty(baseFre) || string.IsNullOrEmpty(currentFre) || baseFre.Length != currentFre.Length)
{
return(false);
}
Cyphers caesar = new Cyphers();
int[] baseT = caesar.GetInputCode(baseFre);
int[] currentT = caesar.GetInputCode(currentFre);
int difference = 0;
if (baseT[0] <= currentT[0])
{
difference = currentT[0] - baseT[0];
}
else
{
difference = caesar.GeneralLength - baseT[0] + currentT[0];
}
string compared = caesar.DecryptCaesar(currentFre[1].ToString(), difference.ToString());
char[] comparedLetter = compared.ToCharArray();
if (baseFre[1] == comparedLetter[0])
{
return(true);
}
return(false);
}
public string DecodeCaesar(string input)
{
LoadBaseTable();
CryptoCyphers decode = new CryptoCyphers();
TextBox tetet = new TextBox();
Dictionary <string, int> currentFrequencyTable = AnalyseText(input);
List <string> currentFrequencyList = currentFrequencyTable.Keys.OrderByDescending(k => currentFrequencyTable[k]).ToList();
int baseMax = 20;
int currentMax = 20;
string output = "";
Cyphers caesar = new Cyphers();
for (int i = 0; i < Math.Min(baseMax, currentFrequencyList.Count); i++)
{
for (int j = 0; j < Math.Min(currentMax, baseFrequencyList.Count); j++)
{
if (IsComparable(baseFrequencyList[j], currentFrequencyList[i]))
{
int[] baseT = caesar.GetInputCode(baseFrequencyList[j]);
int[] currentT = caesar.GetInputCode(currentFrequencyList[i]);
int key = 0;
if (baseT[0] <= currentT[0])
{
key = currentT[0] - baseT[0];
}
else
{
key = caesar.GeneralLength - baseT[0] + currentT[0];
}
// output = "There are all variants:";
output += string.Format("\n\r\n{0}\n\r\n", caesar.DecryptCaesar(input, key.ToString()));
}
}
}
return(output);
}