static void Main(string[] args)
{
Console.WriteLine("Введите стороку для зашифрования");
var str = Console.ReadLine();
Console.WriteLine("El-Gamal");
var elgamalCrypted = ElGamal.EnCrypt(str);
Console.WriteLine("Зашифрованная строка = " + elgamalCrypted);
var elgamalDecrypted = ElGamal.DeCrypt(elgamalCrypted);
Console.WriteLine("decrypted = " + elgamalDecrypted);
Console.ReadLine();
}
/// <summary>
/// Криптоанализ
/// </summary>
/// <param name="ciphermesage">Зашифрованное сообщение</param>
/// <param name="p">Модуль</param>
/// <param name="g">Генератор группы по модулю</param>
/// <returns></returns>
public static string GetPlainFromCipher(List <decimal[]> ciphermesage, decimal p, decimal g, decimal OpenKey)
{
string plain = "";
byte n;
decimal k;
for (int i = 0; i < ciphermesage.Count; i++)
{
k = ElGamal.MatchingAlgorithm(g, ciphermesage[i][0], p);
n = (byte)((ElGamal.PowMod(ElGamal.EuclideanAlgorithm(p, OpenKey), k, p) * ciphermesage[i][1]) % p);
Console.WriteLine($"{ciphermesage[i][0]} = {g}^k mod {p}\nk = {k}");
Console.WriteLine($"M = {n} = (({OpenKey})^-1)^{k} * {ciphermesage[i][1]} mod {p}");
plain += Encoding.ASCII.GetChars(new byte[] { n })[0];
}
return(plain);
}
static void Main(string[] args)
{
ElGamal q = new ElGamal(20996023);
Console.WriteLine($"P: {q.P}\ng: {q.g}\nOpen: {q.KOpen}");
string message = "Test ElGamal";
Console.WriteLine("Input text: " + message);
List <decimal[]> text = q.Encrypting(message);
Console.WriteLine("Encrypted:");
Console.WriteLine(String.Join(" ", text));
Console.WriteLine("Decrypted..." + ElGamal.GetPlainFromCipher(text, q.P, q.g, q.KOpen));
Console.WriteLine("Decrypted:");
Console.WriteLine(q.Decrypting(text));
Console.ReadKey();
}
static void Main(string[] args)
{
// ElGamal q = new ElGamal(2147483647);//(20996023);//(7687);
ElGamal q = new ElGamal(20996023);
Console.WriteLine($"P: {q.P}\ng: {q.g}\nOpen: {q.KOpen}");//Close: {q.KClose}\n
string message = "Valentina Maslennikova";
Console.WriteLine("Input text: " + message);
List <decimal[]> text = q.Encrypting(message);
Console.WriteLine("Encrypted...");
for (int i = 0; i < text.Count; i++)
{
Console.Write("{" + text[i][0] + ", " + text[i][1] + "}, ");
}
Console.WriteLine("\nCryptoanalisis...");
Console.WriteLine("Decrypted..." + ElGamal.GetPlainFromCipher(text, q.P, q.g, q.KOpen));
Console.WriteLine("Decrypted with key...");
Console.WriteLine(q.Decrypting(text));
}