code: public String decrypt(String encrytedText) {
          Objects.requireNonNull(encrytedText, Required.ENCRYPTED_TEXT.toString());
          return decrypt(encrytedText, getSizedSecret(this.config.getApplicationSecret()));
      }
docs: Decrypts an given encrypted text using the application secret property (application.secret) as key
  
  @param encrytedText The encrypted text
  @return The clear text or null if decryption fails