有趣的密码加密，解密

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("****************加密***********\n\n下面对密码： 123456进行加密\n\n");
            Console.WriteLine("请输入加密密钥：  ");
            int key =Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("\n加密后的密码为： ");
            int bykey = 123456^key;
            Console.WriteLine(bykey);
            Console.WriteLine("\n\n\n*********解密*********\n\n 请输入密码进行解密:  \n\n");
            int key1 = Convert.ToInt32(Console.ReadLine());
            int bykey1 = bykey ^ key1;
           string yesno = (123456 == bykey1)?"解密成功":"解密失败";
           Console.WriteLine(yesno);
           Console.ReadLine();


        }
    }
}