//gui key trong tung truong hop tren Hàm receive ở trên
public void gui_key(string x)
{
Tao_p_g();
dh = new Diffie_hellman(p, g);
string s = x + ";" + p + ";" + g + ";" + dh.Publickey;
senddata(s);
}
//Alice Gửi p ,g ,Key Public --> Bob Nhận public_key, p ,g ,private_key random -->Tạo Key Chung
public void send_key_public(string[] mess)
{
SHA256 sha256 = SHA256Managed.Create();
p = Convert.ToInt32(mess[1]);
g = Convert.ToInt32(mess[2]);
dh = new Diffie_hellman(p, g);
dh.Tao_key_chung(Convert.ToInt32(mess[3]));
key = sha256.ComputeHash(Encoding.ASCII.GetBytes(Convert.ToString(dh.Key_Chung)));
txtkey.Text = Convert.ToBase64String(key);
//Bob Gửi public_key qua Alice
senddata(Convert.ToString("Receive_Key" + ";" + dh.Publickey));
session = true;
}