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class SerializableMap<K,V> implements Serializable {
  // other fields and methods...


  private SignedObject signedMap;

  public void sign(Signature sig, PrivateKey key)
    throws IOException, GeneralSecurityException {
    signedMap = new SignedObject( map, key, sig);
    map = null;
  }

  public void unsign(Signature sig, PublicKey key)
    throws IOException, GeneralSecurityException, ClassNotFoundException {
    if (signedMap.verify(key, sig)) {
      map = (HashMap<K,V>) signedMap.getObject();
      signedMap = null;
    }
  }


  private SealedObject sealedMap;

  public void seal(Cipher cipher)
    throws IOException, IllegalBlockSizeException {
    sealedMap = new SealedObject(signedMap, cipher);
    // Now set the Map to null so that original data does not remain in cleartext
    signedMap = null; 
  }

  public void unseal(Cipher cipher)
    throws IOException, GeneralSecurityException, ClassNotFoundException {
    signedMap = (SignedObject) sealedMap.getObject(cipher);
    sealedMap = null;
  }
}