using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        byte[] _byte = new byte[20]

                {

                   10,96,19,9,25,11,15,10,94,10,3,72,12,6,12,95,19,74,10,3

                };

​

            string hello = "b••ev'/}1xo,-";

​

            StringBuilder str = new StringBuilder();

​

            for (int i = 0; i < hello.Length; i++)

            {

                str.Append((char)(hello[i] ^ _byte[i % _byte.Length]));

            }

​

            Console.WriteLine(str.ToString());

    }

}