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Types of physical unclonable function
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<p><a href="/facts/Physical_unclonable_function/eTecxwfJ">Physical unclonable function</a> (PUF), sometimes also called physically unclonable function, is a physical entity that is embodied in a physical structure and is easy to evaluate but hard to predict. </p><p>All PUFs are subject to environmental variations such as temperature, supply voltage and <a href="/facts/Electromagnetic_interference/gv3DlKNr">electromagnetic interference</a>, which can affect their performance. Therefore, rather than just being random, the real power of a PUF is its ability to be different between devices, but simultaneously to be the same under different environmental conditions. </p>