Uniqueness

Uniqueness is a measure for how differently PUF instances of the same class behave. As security is build on the individual behavior, a high uniqueness is a minimum security requirement for any PUF. The concept of uniqueness is also often called inter-distance. pypuf can approximate the uniqueness based on given instances of Simulation or based on response data, see below.

Uniqueness is estimated on a per-challenge basis, as low uniqueness on a small number of challenges can be problematic. To obtain a general uniqueness measure for each response bit, average results along the first axis.