How can I generate a random BigInteger within a certain range?

Question

Consider this method that works well:

public static bool mightBePrime(int N) {
    BigInteger a = rGen.Next (1, N-1);
    return modExp (a, N - 1, N) == 1;
}
         


        

Answer 1

Use the Random-Class

public BigInteger getRandom(int length){
    Random random = new Random();
    byte[] data = new byte[length];
    random.NextBytes(data);
    return new BigInteger(data);
}