Dan Kaminsky's DefCon RNG challenge 12 numbers at the same time in C#

Program.cs

//Created by: Alejandro Palacios (pamanes@gmail.com)
//12 threads get a random number at the "same time" based on Dan Kaminsky's DefCon RNG challenge
using System;
using System.Text;
using System.Threading;

namespace entropy
{
    class Program
    {
        static Random rand = new Random();        
        static long time() { return DateTime.Now.Ticks; }
        static bool flip_coin() { bool n = false; long then = time() + 1; while (time() <= then) { n = !n; } return n; }        
        static long get_fair_bit() { while (true) { bool a = flip_coin(); if (a != flip_coin()) { return (Convert.ToInt64(a)); } } }
        static long get_random_byte() { long n = 0; int bits = 8; while (bits-- > 0) { n <<= 1; n |= get_fair_bit(); } return n; }
        static StringBuilder val = new StringBuilder();
        static object _con_trans_lock = new Object();
        static void Main(string[] args)
        {
            Thread[] threads = new Thread[12];
            while(true)
            {
                for (int i = 0; i < threads.Length; i++)
                    threads[i] = new Thread(new ThreadStart(GetRandomNumber));
                for (int i = 0; i < threads.Length; i++)
                    threads[i].Start();
                foreach (Thread thread in threads)
                    thread.Join();
                Console.Out.WriteLine(val.ToString());
                val.Clear();
            }
        }

        static void GetRandomNumber()
        {
            //8 bits:3, 16 bits: 5, 32 bits: 10
            string rand = get_random_byte().ToString().PadLeft(3, ' ') + " ";
            lock (_con_trans_lock)
                val.Append(rand);
        }
    }
}