... the PUF is changed with a high probability [74]. In other words, the challenge-response behavior of the PUF is altered, and therefore, the PUF will be destroyed. However, it is known that side-channel analysis of the Arbiter PUF can[…] 2018 March 27, Shahin Tajik, On the Physical Security of Physically Unclonable Functions, Springer, →ISBN, page 31:
... the PUF, as shown in Figure 7.12. In this case X is the hardware device that processes the signals between the PUF and the circuit for authentication. Various attributes of the MRAM cells based on random geometric variations are used as[…] 2018 June 11, Betty Prince, David Prince, Memories for the Intelligent Internet of Things, John Wiley & Sons, →ISBN, page 313: