Smart card reader security

[Christian Weinz]

Hello,

I bought a cyberJack go [1] to use it with my openPGP smart card for
authentification. Since the firmware of that device is upgradeable and
is capable of saving atleast 2 GB of data, how can I be sure it is not a
security threat by saving sensitive data?

Best regards,
Christian Weinz

[1]
http://www.scm-pc-card.de/index.php?page=product&function=show_product&lang=en&category_id=46&p=cyberJack%20go&c=SmartCard%20%20%28SCR%29&product_id=825