Encriptar ip con C#

public static string Encriptar(this string _cadenaAencriptar)
        {
            string result = string.Empty;
            byte[] encryted = System.Text.Encoding.Unicode.GetBytes(_cadenaAencriptar);
            result = Convert.ToBase64String(encryted);
            return result;
        }

    using (WebClient client = new WebClient()) {
        client.Proxy = new WebProxy("ip_proxy", port); 
        client.Proxy.Credentials = new NetworkCredential("user", "pass");
   MessageBox.Show(client.DownloadString("https://underc0de.org/foro"));
    }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.VisualBasic;
using System.Collections;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Net.Sockets;

//code chat-bot by mauro & demon ares chat
namespace chat_bot_ares_by_mauro
{
     
    public partial class Form1 : Form
    {
        public Socket Socket;
        public System.Net.Sockets.NetworkStream Stream;
        public byte[] AvatarStream;
       

        public Form1()
        {
            InitializeComponent();
        }

        //
        public void ConectarB0t(IPAddress ip, int puerto)
        {
          
            Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

          
            label1.Text = "Conectando por favor espera";
            

            try
            {
                Socket.Connect(new IPEndPoint(ip, Convert.ToInt32(puerto)));


            }
            catch (Exception ex)
            {
            }
            if (Socket.Connected == true)
            {

                label1.Text = "Conectando iniciando protocolo";

                Socket.Send(MSG_CHAT_CLIENT_LOGIN());
              
                label1.Text = "Autenticado, chat bot conectado!";


            }
            else
            {
            }
        }

        private string GetLocalIpAddress()
        {
            throw new NotImplementedException();
        }

        private string Encriptar()
        {
            throw new NotImplementedException();
        }

        //
        public byte[] MSG_CHAT_CLIENT_LOGIN()
        {
            //Aclaracion Este codigo no es de cb0t ni nada parecido!!!
            List<byte> buffer = new List<byte>();
            //nueva cadena de bytes
            //id 2
            buffer.AddRange(new byte[] { 2 });
            buffer.AddRange(Guid.NewGuid().ToByteArray());
            //guid 16 bytes
            buffer.AddRange(BitConverter.GetBytes(Convert.ToInt16(666)));
            //Numero de archivos
            //Null 1byte
            buffer.AddRange(new byte[] { 0 });
            buffer.AddRange(BitConverter.GetBytes(Convert.ToInt16(5555)));
            //puerto DC
            //nueva cadena de bytes
            //Nodos ip. 4bytes
            //Nodos puerto 2 bytes
            //4bytes Null.
            buffer.AddRange(new byte[] {
		0,
		0,
		0,
		0,
		0,
		0,
		0,
		0,
		0,
		0
	});
            buffer.AddRange(Encoding.UTF8.GetBytes(Nombre.Text));
            //Nick x bytes
            //Null 1byte
            buffer.AddRange(new byte[] { 0 });
            buffer.AddRange(Encoding.UTF8.GetBytes("chat bot c# by mauro - 1"));
            //cliente version xbyte
            //nueva cadena de bytes
            //1byte Null.
            //Local IpAdress 4 bytes
            //External IpAdress Null. 4bytes
            //client features 1 byte
            //current upload 1byte
            //maximum uploads allowed 1byte
            //current queued users
            //User años 1byte, User sexo 1byte, User country 1byte
            buffer.AddRange(new byte[] {
		0,
		127,
		0,
		0,
		1,
		6,
		6,
		6,
		6,
		0,
		0,
		0,
		0,
		20,
		1,
		69
	});
            buffer.AddRange(Encoding.UTF8.GetBytes("Ares"));
            //User location xbyte
            //Null 1byte
            buffer.AddRange(new byte[] { 0 });
            buffer.InsertRange(0, BitConverter.GetBytes(Convert.ToInt16(buffer.Count - 1)));
            return buffer.ToArray();
        }

        


        //
        
        private void button1_Click(object sender, System.EventArgs e)
        {
            string i = IP.Text;
            string p = Puerto.Text;

            ConectarB0t(System.Net.IPAddress.Parse(i), int.Parse(p));

          
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //Enviamos el texto a la sala
            //Utilizamos este metodo para no agregar la clase AresPacket
            // en la version 2 agregaremos como enviar avatar en esta version

            List<byte> buffer = new List<byte>();
            //nueva cadena de bytes
            buffer.AddRange(new byte[] { 10 });
            //Public chat 10
            buffer.AddRange(Encoding.UTF8.GetBytes((textBox1.Text)));
            //xbytes
            buffer.InsertRange(0, BitConverter.GetBytes(Convert.ToInt16(buffer.Count - 1)));
            Socket.Send(buffer.ToArray());

            textBox1.Clear();

            //
        }
    }
}

// create a new ProxySocket
ProxySocket s = new ProxySocket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// set the proxy settings
s.ProxyEndPoint = new IPEndPoint(IPAddress.Parse("10.0.0.5"), 1080);
s.ProxyUser = "username";
s.ProxyPass = "password";
s.ProxyType = ProxyTypes.Socks5;    // if you set this to ProxyTypes.None, 
                                    // the ProxySocket will act as a normal Socket
// connect to the remote server
// (note that the proxy server will resolve the domain name for us)
s.Connect("www.mentalis.org", 80);
// send an HTTP request
s.Send(Encoding.ASCII.GetBytes("GET / HTTP/1.0\r\nHost: www.mentalis.org\r\n\r\n"));
// read the HTTP reply
int recv = 0;
byte [] buffer = new byte[1024];
recv = s.Receive(buffer);
while (recv > 0) {
    Console.Write(Encoding.ASCII.GetString(buffer, 0, recv));
    recv = s.Receive(buffer);
}
// wait until the user presses enter
Console.WriteLine("Press enter to continue...");
Console.ReadLine();