public void Challenge4_Solution()
{
var inputFile = new StreamReader("Assets/inputForChallenge4.txt");
var results = new Dictionary <string, double>();
while (!inputFile.EndOfStream)
{
var encryptedLine = Converter.FromHexStringToByteArray(inputFile.ReadLine().Trim());
var key = SingleByteXorCipher.FindSingleByteKey(encryptedLine);
var decryptedText = SingleByteXorCipher.Decrypt(encryptedLine, key);
var score = SingleByteXorCipher.ScoreAccordingToEnglishLetterFrequency(Encoding.Default.GetBytes(decryptedText));
results.Add(decryptedText, score);
}
var hiddenMessage = results.OrderByDescending(x => x.Value).First();
Assert.AreEqual("Now that the party is jumping\n", hiddenMessage.Key);
Console.WriteLine($"Score:{hiddenMessage.Value}");
}
public void Challenge3_Solution()
{
var inputByteArray = Converter.FromHexStringToByteArray(_hexStringInput);
var key = SingleByteXorCipher.FindSingleByteKey(inputByteArray);
Assert.AreEqual('X', Convert.ToChar(key));
var decryptedText = SingleByteXorCipher.Decrypt(inputByteArray, key);
Assert.AreEqual("Cooking MC's like a pound of bacon", decryptedText);
}
public void SingleByteXorCipher_Test()
{
// assign
string input = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736";
string key = null;
string expected = "Cooking MC's like a pound of bacon";
// execute
string actual = SingleByteXorCipher.Decrypt(input, out key);
// assert, ignore case
Assert.IsNotNull(actual);
Assert.IsNotNull(key);
Assert.AreEqual(expected, actual, true);
System.Diagnostics.Debug.WriteLine("------------------");
System.Diagnostics.Debug.WriteLine(actual);
System.Diagnostics.Debug.WriteLine("------------------");
}