public Serializable decrypt(String source) 
{
        SecretKeySpec spec = getSecretKeySpec();
        try {
            byte[] data = Base64.decode(source);
            Cipher c = Cipher.getInstance(spec.getAlgorithm());
            c.init(Cipher.DECRYPT_MODE, spec);
            ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(data));
            SealedObject so = (SealedObject) in.readObject();
            return (Serializable) so.getObject(c);
        } catch (Exception e) {
            log.error("Unable to decrypt", e);
            return null;
        }
}

Given a String which is the Base64-encoded encrypted data, retrieve the original Object.

 public String encrypt(Serializable source) 
{
        SecretKeySpec spec = getSecretKeySpec();
        try {
            Cipher c = Cipher.getInstance(spec.getAlgorithm());
            c.init(Cipher.ENCRYPT_MODE, spec);
            SealedObject so = new SealedObject(source, c);
            ByteArrayOutputStream store = new ByteArrayOutputStream();
            ObjectOutputStream out = new ObjectOutputStream(store);
            out.writeObject(so);
            out.close();
            byte[] data = store.toByteArray();
            byte[] textData = Base64.encode(data);
            return new String(textData, "US-ASCII");
        } catch (Exception e) {
            log.error("Unable to encrypt", e);
            return null;
        }
}

Gets a String which contains the Base64-encoded form of the source, encrypted with the key from getSecretKeySpec().

 abstract protected SecretKeySpec getSecretKeySpec()