By: Charles Hsu and MengYi Wu
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PUF stands for “Physically Unclonable Function” and is a physically derived “fingerprint” that serves as a unique identity for semiconductor devices. Their properties depend on the uniqueness and randomness of the physical factors induced during the manufacturing stage of a chip. These physical variations are unpredictable and unclonable; that’s why PUFs are suitable to serve as a root of trust with security functions in devices. In practice, we could transfer those microvariations of PUFs into sequences that consist of 0 and 1 in order to be used as keys, identities, or nonce for advanced security functions.
Since there are many ways to produce PUFs, there will also be many differences in its performance. Generally, PUFs can be evaluated by four dimensions including randomness, uniqueness, robustness and traceability as defined below…
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