Comparison of the time difference between a cryptographically safe RNG and the standard RNG.

Cryto-RNG vs RNG

using System;
using System.Diagnostics;
using System.Security.Cryptography;

namespace CrytoTest
{
  class Program
  {
    private static Random m_rng = new Random();
    private static RNGCryptoServiceProvider m_crng = new RNGCryptoServiceProvider();
    
    static void Main( string[] args )
    {
      int runs = 1000000;
      Stopwatch sw = Stopwatch.StartNew();
      RunCryto( runs );
      sw.Stop();
      Console.WriteLine(sw.Elapsed.ToString());

      sw.Restart();
      RunNormal( runs );
      sw.Stop();
      Console.WriteLine( sw.Elapsed.ToString() );

      Console.Read();
    }

    private static void RunNormal( int i )
    {
      byte[] br = new byte[10];
      for ( int j = 0; j < i; j++ )
        m_rng.NextBytes( br );
    }

    private static void RunCryto( int i )
    {
      byte[] br = new byte[10];
      for ( int j = 0; j < i; j++ )
        m_crng.GetBytes( br );
    }
  }
}