public static void FrequencyTable()
{
var text = "aaa";
var key = "69";
Xor.SingleByteXorEncrypt(text, key);
}
private static void Task4()
{
var str1 = "1c0111001f010100061a024b53535009181c";
var str2 = "686974207468652062756c6c277320657965";
var result = "746865206b696420646f6e277420706c6179";
Console.WriteLine(Xor.BytePerByteFromHexToHex(str1, str2).ToLower());
Console.WriteLine(result == Xor.BytePerByteFromHexToHex(str1, str2).ToLower());
Console.WriteLine(Hex.FromHexString("746865206b696420646f6e277420706c6179"));
}
private static void Task51()
{
var text = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736";
var a = text.Length; //68
for (int i = 2; i < a / 2; i++)
{
if (a % i != 0)
{
continue;
}
var length = text.Length / i;
var strs = new List <string>();
//делим блоки попарно
for (var t = 0; t < i; t++)
{
var tmp = text.Substring(t * length, length);
strs.Add(tmp);
}
if (strs.Count % 2 != 0)
{
continue;
}
//находим расстояние
var averageHamingDistance = 0;
for (var t = 0; t < strs.Count; t += 2)
{
var xor = Xor.XoringTwoBinars(strs[t], strs[t + 1]);
var HammingDistance = xor.Count(x => x == '1');
averageHamingDistance += HammingDistance;
}
averageHamingDistance /= strs.Count / 2;
//Взламываем
var blocks = new StringBuilder();
for (var m = 0; m *averageHamingDistance < text.Length; m++)
{
blocks.Append(new String(text.Skip(m * averageHamingDistance).Take(averageHamingDistance).ToArray()));
}
var kek = blocks.Length;
Console.WriteLine("\n");
}
var d = a / 4; //16
}
public static void Task5()
{
var text = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736";
//var text = "ciphertext";
//68
Console.WriteLine((Xor.RepeatingKey(text, "88")));
var str = new StringBuilder();
var results = new Dictionary <int, double>();
for (var i = 1; i < text.Length / 2; i++)
{
str.Append(new string(text.Skip(text.Length - i).ToArray()));
str.Append(new string(text.Take(text.Length - i).ToArray()));
var count = text.Select((t1, t) => t1 == str.ToString()[t] ? 1 : 0).Sum();
var value = (double)count / text.Length;
str.Clear();
results.Add(i, value);
Console.WriteLine("{0} {1}", i, Math.Round(value, 3, MidpointRounding.ToEven));
}
var temp = results.ToList();
temp.Sort((x, m) => x.Value.CompareTo(m.Value));
temp.Reverse();
var blocks = new List <string>();
for (var i = 0; i < 2; i++)
{
var distance = temp[i].Key;
var index = 0;
var stringB = new StringBuilder();
for (var m = 0; m < distance; m++)
{
index = m;
while (index < text.Length)
{
stringB.Append(text[index]);
index += distance;
}
blocks.Add(stringB.ToString());
stringB.Clear();
}
//получаем блоки
var b = Xor.RepeatingKey(blocks[0], " ");
Console.WriteLine();
}
}
private static void Task7()
{
string[] text =
{
"Burning 'em, if you ain't quick and nimble",
"I go crazy when I hear a cymbal"
};
var key = "ICE";
var adaptiveKey = new StringBuilder();
adaptiveKey.Append(key);
foreach (var str in text)
{
var tmp = Xor.RepeatingKey(str, key);
Console.WriteLine(tmp);
}
}
