i found this interesting peice of code on the learning section under libraries on the main site.

import processing.net.*;

int port = 10002;
boolean myServerRunning = true;
int bgColor = 0;
int direction = 1;
int textLine = 60;

Server myServer;

void setup()
{
 size(400, 400);
 textFont(createFont("SanSerif", 16));
 myServer = new Server(this, port); // Starts a myServer on port 10002
 background(0);
}

void mousePressed()
{
 // If the mouse clicked the myServer stops
 myServer.stop();
 myServerRunning = false;
}

void draw()
{
 if (myServerRunning == true)
 {
   text("server", 15, 45);
   Client thisClient = myServer.available();
   if (thisClient != null) {
     if (thisClient.available() > 0) {
       text("mesage from: " + thisClient.ip() + " : " + thisClient.readString(), 15, textLine);
       textLine = textLine + 35;
     }
   }
 }
 else
 {
   text("server", 15, 45);
   text("stopped", 15, 65);
 }
}

it looks like its only the server...but it looks promising. How would i make it so it scrambles the text sent and descrabmles it when it reaches the other person