Patent attributes
Systems and method are provided for determining a reliability of a physically unclonable function (PUF) cell of a device. A first signal is provided to a first branch of a PUF cell and a second signal is provided to a second branch of the PUF cell, the first and second signals being provided in synchronization. A base PUF cell value is determined based on an output of the PUF cell produced by the first signal and the second signal. A third signal is provided to the first branch and a fourth signal is provided to the second branch, the third signal and fourth signal being provided out of synchronization. A stressed PUF cell value is determined based on an output of the PUF cell produced by the third signal and the fourth signal. The PUF cell is determined to be unusable based on a difference between the PUF cell value and the stressed PUF cell value.
