Physical Unclonable Functions
Physical Unclonable Functions, commonly knows as PUFs, are a mechanism that leverages the manufacture variability of devices to generate secrets.
A PUF is interrogated by means of a challenge and it
returns a response, normally a bit. A challenge and its
corresponding response are called Challenge Response Pair(CRP). The set
of all CRPs of a physical device is different from all CRPs of a
different device.