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Recyclable PUFs: Logically reconfigurable PUFs

: Katzenbeisser, S.; Koçabas, Ü.; Leest, V. van der; Sadeghi, A.-R.; Schrijen, G.-J.; Schröder, H.; Wachsmann, C.


Preneel, B.:
Cryptographic hardware and embedded systems, CHES 2011. Proceedings : 13th international workshop, Nara, Japan, September 28 - October 1, 2011
Heidelberg: Springer, 2011 (Lecture Notes in Computer Science 6917)
ISBN: 3-642-23950-1
ISBN: 978-3-642-23950-2
ISBN: 978-3-642-23951-9
ISSN: 0302-9743
International Workshop on Cryptographic Hardware and Embedded Systems (CHES) <13, 2011, Nara>
Conference Paper
Fraunhofer SIT ()

We introduce the concept of Logically Reconfigurable Physical Unclonable Functions (LR-PUFs). In contrast to classical Physically Unclonable Functions (PUFs) LR-PUFs can be dynamically 'reconfigured' after deployment such that their challenge/response behavior changes in a random manner. To this end, we amend a conventional PUF with a stateful control logic that transforms challenges and responses of the PUF. We present and evaluate two different constructions for LR-PUFs that are simple, efficient and can easily be implemented. Moreover, we introduce a formal security model for LR-PUFs and prove that both constructions are secure under reasonable assumptions. Finally, we demonstrate that LR-PUFs enable the construction of securely recyclable access tokens, such as electronic tickets: LR-PUFs enhance security against manipulation and forgery, while reconfiguration allows secure re-use of tokens for subsequent transactions.