public IssueTryout() {

    try {
      initEmuCardService();
      CredentialDescription cd =
          DescriptionStore.getInstance().getCredentialDescriptionByName("Surfnet", "root");
      IdemixSecretKey isk = IdemixKeyStore.getInstance().getSecretKey(cd);

      // Setup the attributes that will be issued to the card
      Attributes attributes = new Attributes();
      attributes.add("userID", "*****@*****.**".getBytes());
      attributes.add("securityHash", "DEADBEEF".getBytes());

      // Setup a connection and send pin for emulated card service
      IdemixService is = new IdemixService(cs);
      IdemixCredentials ic = new IdemixCredentials(is);
      ic.connect();

      is.sendPin("0000".getBytes());
      ic.issue(cd, isk, attributes, null); // null indicates default expiry

      final Path path = Paths.get(System.getProperty("user.dir"), "card.json");
      IRMACardHelper.storeState(card, path);

      // Setup a connection to a real card
      //            CardService real = new TerminalCardService();   <--- doesn't exist?

    } catch (Exception e) {
      e.printStackTrace();
    }
  }
    @Override
    protected Exception doInBackground(Void... voids) {
      Log.i(TAG, "Loading DescriptionStore and IdemixKeyStore");
      FileReader reader = new AndroidFileReader(MainActivity.this);
      SSLSocketFactory socketFactory = null;
      if (Build.VERSION.SDK_INT >= 21) // 20 = 4.4 Kitkat, 21 = 5.0 Lollipop
      socketFactory = new SecureSSLSocketFactory();

      try {
        DescriptionStore.initialize(
            new DescriptionStoreDeserializer(reader), IRMApp.getStoreManager(), socketFactory);
        Log.i(TAG, "Loaded DescriptionStore");
        publishProgress();

        IdemixKeyStore.initialize(new IdemixKeyStoreDeserializer(reader), IRMApp.getStoreManager());
        Log.i(TAG, "Loaded IdemixKeyStore");
        return null;
      } catch (InfoException e) {
        return e;
      }
    }
    @Override
    protected void onPostExecute(Exception e) {
      Log.i(TAG, "Finished loading DescriptionStore and IdemixKeyStore");
      if (e != null) throw new RuntimeException(e);
      else setState(State.KEY_STORE_LOADED);

      for (SchemeManager manager : DescriptionStore.getInstance().getSchemeManagers()) {
        if (manager.hasKeyshareServer()
            && !CredentialManager.isEnrolledToKeyshareServer(manager.getName())) {
          final SchemeManager m = manager;
          SchemeManagerHandler.getKeyserverEnrollInput(
              MainActivity.this,
              new SchemeManagerHandler.KeyserverInputHandler() {
                @Override
                public void done(String email, String pin) {
                  SchemeManagerHandler.enrollCloudServer(
                      m.getName(), m.getKeyshareServer(), email, pin, MainActivity.this, null);
                }
              });
        }
      }
    }