Question

How to generates high-quality random numbers using RNGCryptoServiceProvider() in C#

Answer 1

using System;
using System.Security.Cryptography;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
            {
                byte[] arr = new byte[4];

                for (int i = 0; i < 10; i++)
                {
                    rng.GetBytes(arr);

                    int n = BitConverter.ToInt32(arr, 0);
                    Console.WriteLine(n);
                }
            }
        }
    }
}


/*
run:
    
1382154183
1385868911
-841902702
-68443939
-1697870295
-824491233
-767157963
2003038576
-1294213352
-1576860415

*/

 

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Answer 2

using System;
using System.Security.Cryptography;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
            {
                byte[] arr = new byte[8];

                for (int i = 0; i < 10; i++)
                {
                    rng.GetBytes(arr);

                    long l = BitConverter.ToInt64(arr, 0);
                    Console.WriteLine(l);
                }
            }
        }
    }
}


/*
run:
    
1105285152613526239
-7526214951867634496
2229869605864289356
4740238405064005438
7225780467784143383
1794344645003941858
3498039857658745371
1476085524233489547
-1513230619995224599
7923792023615854548

*/

 

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Answer 3

using System;
using System.Security.Cryptography;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
            {
                byte[] arr = new byte[2];

                for (int i = 0; i < 10; i++)
                {
                    rng.GetBytes(arr);

                    int n = BitConverter.ToInt16(arr, 0);
                    Console.WriteLine(n);
                }
            }
        }
    }
}


/*
run:
    
-9119
7040
-6459
17857
5422
20904
21091
18887
25836
-7054

*/

 

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