private void SetKey()
{
var rnd = new Random();
var k = new byte[Rnd.Next(400, 600)];
for (int i = 0; i < k.Length; i++)
{
k[i] = (byte)(Rnd.Next(0, 128) + rnd.Next(0, 128));
}
var k2 = KeyEncoding.GetBytes("089~`tgjРР·dfgорЫГ9♫7ПМпfghjp147&$#hf%#h^^gxчмиА▀ЫЮББЮю,><2en]√");
int oldLen = k.Length;
Array.Resize(ref k, k.Length + k2.Length);
Array.Copy(k2, 0, k, oldLen, k2.Length);
Key = cryptoHash.GetHash(k);
}