>The display and user buttons protect against an attack launched from the host machine. Before the unit performs a cryptographic operation it can display inform

>The display and user buttons protect against an attack launched from the host machine. Before the unit performs a cryptographic operation it can display information about what it is about to do on the display and wait for the user to confirm the operation by pushing one of the user input buttons on the unit. As the author is here, I'd suggest adding a beeper as a way to alert about potentially unsolicited access to the module.