Abstract
This paper presents circuit designs to be used as 'public-key' Physical Uncloneable Functions. We will introduce two specially designed circuits: 'skew' memories and massively parallel analog processor arrays (CNNs). We show that such circuits - which are possible to simulate but computationally outperform any feasible digital and hardware-assisted emulation - can be used to remotely and securely identify their owner and serve as a basis for various cryptographic protocols.