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A PUF (Physical Uncloneable Function) is a method for designing a circuit which it is infeasible to reproduce or simulate exactly, and from which a unique secret key can be extracted.

A PUF (Physical Uncloneable Function) is a method for effectively embedded a unique secret key in a hardware chip. Minute unpredictable details of the chip manufacturing process results in a circuit which is infeasible to reproduce or simulate exactly. A unique secret key can be derived by invoking the circuit with a series of inputs.