Processor-Based Strong Physical Unclonable Functions with Aging-Based Response Tuning

TitleProcessor-Based Strong Physical Unclonable Functions with Aging-Based Response Tuning
Publication TypeJournal Article
Year of Publication2013
AuthorsKong, J., and F. Koushanfar
JournalIEEE Transactions on Emerging Topics in Computing
Date Published11/2013
KeywordsCircuit aging, Multi-core processor, Negative bias temperature instability, Physically unclonable function, Post-silicon tuning, Secure computing platform

A strong physically unclonable function (PUF) is a circuit structure that extracts an exponential number of unique chip signatures from a bounded number of circuit components. The strong PUF unique signatures can enable a variety of low-overhead security and intellectual property protection protocols applicable to several computing platforms. This paper proposes a novel lightweight (low overhead) strong PUF based on the timings of a classic processor architecture. A small amount of circuitry is added to the processor for on-the-fly extraction of the unique timing signatures. To achieve desirable strong PUF properties, we develop an algorithm that leverages intentional post-silicon aging to tune the inter- and intra-chip signatures variation. Our evaluation results show that the new PUF meets the desirable inter- and intra-chip strong PUF characteristics, whereas its overhead is much lower than the existing strong PUFs. For the processors implemented in 45 nm technology, the average inter-chip Hamming distance for 32-bit responses is increased by 16.1% after applying our post-silicon tuning method; the aging algorithm also decreases the average intra-chip Hamming distance by 98.1% (for 32-bit responses).

Processor-Based Strong_PUF_With_Aging_Based_Response_Tuning.pdf8.36 MB


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