Another reason to not use java.util.Random for serious random data ;)

EasterEgg.java

import java.util.Random;

public class EasterEgg {
  public static void main(String[] args) {
    System.out.println(new EasterEgg());
  }

  public String toString() {
    return String.format(
      "%s %s %s %s %s!\n\tSigned by %s, %s, %s, %s, %s, %s, %s, %s%s, %s, %s, %s, %s",
      prettyString(9168705, 'a'),
      prettyString(623241, ']'),
      prettyString(121394, '['),
      prettyString(156312575, '\\'),
      prettyString(2773044, '\\'),
      prettyString(1203740, '\\'),
      prettyString(669708568, '^'),
      prettyString(10807722, '`'),
      prettyString(221827436, '['),
      prettyString(-70136084, 'e'),
      prettyString(602660054, 'X'),
      prettyString(-91532585, ']'),
      prettyString(900001449, 'Z'),
      prettyString(900432017, 'l'),
      prettyString(301097935, '_'),
      prettyString(-99997884, 'a'),
      prettyString(378414549, '\\'),
      prettyString(512314520, '`')
    );
  }


  public static String prettyString(long i, char base) {
    Random ran = new Random(i);
    StringBuilder sb = new StringBuilder();
    for (int n = 0; ; n++) {
      int k = ran.nextInt(27);
      if (k == 0) break;

      sb.append((char) (base + k));
    }

    return sb.toString();
  }
}

EasterEggGenerator.java

import java.util.Random;

public class EasterEggGenerator {

  public static void main(String[] args) {
    long time = System.currentTimeMillis();
    generate("hello",    0L, 1_000_000_000L);
    generate("from",    0L, 1_000_000_000L);
    generate("the",    0L, 1_000_000_000L);
    generate("libon",    0L, 1_000_000_000L);
    generate("team",    0L, 1_000_000_000L);
    generate("brice",   0L, 1_000_000_000L);
    generate("arnaud",    0L, 1_000_000_000L);
    generate("fabien",  0L, 1_000_000_000L);
    generate("pierre",     500_000L, 1_000_000_000L);
    generate("pierre",     500_000_000L, 1_000_000_000L);
    generate("mimix",    -100_000_000L, 1_000_000_000L);
    generate("tiger",    -100_000_000L, 1_000_000_000L);
    generate("alex",    300_000_000L, 1_000_000_000L);
    generate("al",    900_000_000L, 1_000_000_000L);
    generate("nour",    900_000_000L, 1_000_000_000L);
    generate("pj",    -100_000_000L, 1_000_000_000L);
    generate("romain",    -100_000_000L, 1_000_000_000L);
    generate("duyhai",     500_000L, 1_000_000_000L);

    System.out.println("Took " + (System.currentTimeMillis() - time) + " ms");
  }


  private static void generate(String goal, long minValue, long maxValue) {
    long[] seed = generateSeed(goal, minValue, maxValue);
    System.out.println("prettyString(" + seed[0] + ", '" + (char) seed[1] + "'),\t// => " + prettyString(seed[0], (char) seed[1]));
  }


  public static long[] generateSeed(String goal, long start, long finish) {
    char[] input = goal.toCharArray();
    char[] pool = new char[input.length];
    label:
    for (long seed = start; seed < finish; seed++) {
      Random random = new Random(seed);

      for (int i = 0; i < input.length; i++)
        pool[i] = (char) random.nextInt(27);

      if (random.nextInt(27) == 0) {
        int base = input[0] - pool[0];
        for (int i = 1; i < input.length; i++) {
          if (input[i] - pool[i] != base)
            continue label;
        }
        return new long[]{seed, base};
      }

    }

    return null; // sorry got nothing
  }


  public static String prettyString(long i, char base) {
    Random ran = new Random(i);
    StringBuilder sb = new StringBuilder();
    for (int n = 0; ; n++) {
      int k = ran.nextInt(27);
      if (k == 0)
        break;

      sb.append((char) (base + k));
    }

    return sb.toString();
  }

}