A sub-threshold SRAM based PUF

The uniqueness and randomness of Physical Unclonable Functions (PUFs) allow secret keys to be stored in a tamper-proof package. In this paper, we propose a design for using a 65nm 10T sub-threshold Static Random Access Memory (SRAM) as a PUF. For this PUF, the challenge is the sub-threshold supply voltage and the response is the fingerprint obtained from the initial values of the cells when powered-up. In this design, we achieve significant improvements in power consumption and security over existing designs which makes it promising for low-power security applications.