Source code: Freenet/client/Scrambler.java

   package Freenet.client;
   
   public class Scrambler
   {
       public static void main(String[] args)
       {
     String p = "plaintext";
     System.out.println("Input: "+p);
     String[] r = scramble(p);
    System.out.println("Output: "+unscramble(r[0], r[1]));
      }
  
      public static String[] scramble(String in)
      {
    StringBuffer out1 = new StringBuffer(in.length());
    StringBuffer out2 = new StringBuffer(in.length());
    java.util.Random r = new java.util.Random();
    for (int x=0; x<in.length(); x++)
        {
      int rand = (char) r.nextInt();
      out1.append((char) (rand ^ ((int) in.charAt(x))));
      out2.append((char) rand);
        }
    String[] ret = new String[2];
    ret[0] = out1.toString();
    ret[1] = out2.toString();
    return ret;
      }
  
      public static String unscramble(String a, String b)
      {
    if (a.length() != b.length())
        throw new RuntimeException("Arguments to unscramble are not same length");
    StringBuffer out = new StringBuffer(a.length());
    for (int x=0; x<a.length(); x++)
        {
      out.append((char) (a.charAt(x) ^ b.charAt(x)));
        }
    return out.toString();
      }
  }