Data can be encrypted for transfer using software-based or hardware-based security modules. However, the cryptographic key stored in this software or hardware gives attackers the opportunity to use it for their own ends. The use of mobile devices, such as smartphones and tablets, is problematic because the necessary keys are stored on the device and can be discovered.
A German university offers is a retrofittable, protocol-independent, hardware-based security module for encrypting and decrypting data for internode transmission.