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Physical unclonable functions (PUFs), as hardware security primitives,exploit manufacturing randomness to extract hardware instance-specific secrets.One of most popular structures is time-delay based Arbiter PUF attributing tolarge number of challenge response pairs (CRPs) yielded and its compactrealization. However, modeling building attacks threaten most variants of APUFsthat are usually employed for strong PUF-oriented application---lightweightauthentication---without reliance on the securely stored digital secrets basedstandard cryptographic protocols. In this paper, we investigate areconfigurable latent obfuscation technique endowed PUF construction, coined asOB-PUF, to maintain the security of elementary PUF CRPs enabled authenticationwhere a CRP is never used more than once. The obfuscation---determined by saidrandom patterns---conceals and distorts the relationship betweenchallenge-response pairs capable of thwarting a model building adversaryneeding to know the exact relationship between challenges and responses. A bitfurther, the obfuscation is hidden and reconfigured on demand, in other words,the patterns are not only invisible but also act as one-time pads that are onlyemployed once per authentication around and then discarded. As a consequence,the OB-PUF demonstrates significant resistance to the recent revealed powerfulEvaluation Strategy (ES) based modeling attacks where the direct relationshipbetween challenge and response is even not a must. The OB-PUF's uniqueness andreliability metrics are also systematically studied followed by formalauthentication capability evaluations.

Modeling Attack Resilient Reconfigurable Latent Obfuscation Technique for PUF based Lightweight Authentication