static void Main(string[] args)
{
// most common words according to wikipedia: http://en.wikipedia.org/wiki/Most_common_words_in_English
var commonWords = new[] { "the", "be", "to", "of", "and" };
var filesToDelete = Directory.EnumerateFiles(@".", "*.txt").Where(fn => fn != ".\\cipher1.txt");
foreach (var file in filesToDelete)
{
File.Delete(file);
}
var cipherText = File.ReadAllText(@"cipher1.txt").Split(',').Select(n => (byte)int.Parse(n)).ToArray();
// a = 97, z = 122
for (byte i = 97; i <= 122; i++)
{
for (byte j = 97; j <= 122; j++)
{
for (byte k = 97; k <= 122; k++)
{
var secret = new byte[] { i, j, k };
var decodedText = new Xor(secret).DoXor(cipherText, Encoding.ASCII);
bool isPotential = true;
foreach (var commonWord in commonWords)
{
if (!decodedText.Contains(commonWord))
{
isPotential = false;
break;
}
}
if (isPotential)
{
var bytes = Encoding.ASCII.GetBytes(decodedText);
Console.WriteLine(bytes.Select(b => (int)b).Sum());
}
}
}
}
Console.WriteLine("Done");
Console.ReadKey();
}
