private BigInteger GenerateA(BigInteger n)
{
Random random = new Random();
BigInteger a = random.Next(1, (int)n), nod = GCD.GetNOD(a, n);
while (nod != 1)
{
a = random.Next(1, (int)n);
nod = GCD.GetNOD(a, n);
}
return(a);
}
public string Decrypt(BigInteger[] encryptedText)
{
byte[] decryptedText = new byte[encryptedText.Length];
for (int i = 0; i < encryptedText.Length; i++)
{
StringBuilder symbol = new StringBuilder("00000000");
BigInteger s = BigInteger.ModPow(BigInteger.Multiply(encryptedText[i], GCD.ModInverse(a, n)), 1, n);
BigInteger diff = s;
while (diff > 0)
{
BigInteger[] lessThenDiff = d.Where(el => el <= diff).ToArray();
if (lessThenDiff.Length > 0)
{
BigInteger maxItem = lessThenDiff.Max();
diff -= maxItem;
if (diff >= 0)
{
symbol.Remove(Array.IndexOf(d, maxItem), 1);
symbol.Insert(Array.IndexOf(d, maxItem), "1");
}
}
else
{
break;
}
}
decryptedText[i] = Convert.ToByte(symbol.ToString(), 2);
}
return(Encoding.ASCII.GetString(decryptedText));
}
