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A 47 F²/bit charge-sharing based sequence-dependent PUF with a permutative challenge

: Müller, Kai-Uwe; Stanitzki, Alexander; Kokozinski, Rainer


Institute of Electrical and Electronics Engineers -IEEE-:
International Conference on Omni-layer Intelligent Systems, COINS 2020 : 31 August - 2 September 2020, Barcelona, Spain
Piscataway, NJ: IEEE, 2020
ISBN: 978-1-7281-6371-0
ISBN: 978-1-7281-6372-7
ISBN: 978-1-7281-6370-3
International Conference on Omni-layer Intelligent Systems (COINS) <2020, Online>
Fraunhofer IMS ()
physically unclonable functions (PUF); hardware security

Small sensor and actor nodes are often excluded from security mechanisms because of the lack of performance for cryptographic applications or the lack of a non-volatile memory to store the secret keys for such applications. Physical Unclonable Functions (PUFs) provide a good way for a secure key storage, but are also not necessarily lightweight in terms of area and power consumption. A PUF concept based on a capacitor array is described, which uses the a passive charge sharing technique and is able to accept a high number of challenges as input. By using pair building, an 8-stage array is able to derive up to 20160 bits of key material with an area use of 47F2/bit in a 350nm CMOS technology.