code: public String encrypt(String toEncrypt) throws DuraCloudRuntimeException {
          try {
              byte[] input = toEncrypt.getBytes("UTF-8");
              cipher.init(Cipher.ENCRYPT_MODE, key);
              byte[] cipherText = cipher.doFinal(input);
              return encodeBytes(cipherText);
          } catch (Exception e) {
              throw new DuraCloudRuntimeException(e);
          }
      }
docs: Provides basic encryption on a String.