The Fraunhofer Institute for Applied and Integrated Security (AISEC) is developing a very versatile and flexible form of Physically Unclonable Function (PUF), one that can wrap an entire circuit board to secure it from physical attacks.
The foil-based solution consists of patterned metal electrodes embedded into a polymer film with a self-adhesive backing. The electrodes are connected to the board to be protected and special read-out software IP running on the board's controller can extract the PUF from the film as is has been wrapped around or stuck to the board.
Try to remove the PUF sticker, pinch it to probe through it, scratch it or unseal it and the PUF will be altered. By detecting that change, the circuit board will be able to take any counter-measure it will have been programmed for, for example sending an alert message and disabling itself at run-time, or wiping out all of its embedded software.
Showing a demo at Embedded World, Fraunhofer AISEC's head researcher on the so-called PEP project (Protecting Electronic Products, maybe with a pun intended on Polyethylene Plastics), Sven Plaga didn't want to say too much about the internals of the film.
“Now we are exploring electrode patterns of different shapes and complexities as well as correction algorithms to ensure the PUF's stability over time and across different temperatures as the film could shrink or expand”.
To read more of this external content, go to “Stick a PUF to Your Board.”
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