Design of compact CN delay-based PUFS in 65nm CMOS

Physical Unclonable Functions (PUFs) exploit the statistical variation of CMOS circuit during manufacture process to generate unclonable secret data. In the paper, compact C²_n delay-based PUFs (C²_n -PUFs) is designed in TSMC 65nm CMOS technology. After configuring the delay-paths, C²_n-PUFs build different data without circuit replace. C²_n combination method exponential decreases the number of delay path with keeping the output data bits. In custom designed, the area of 128-bit C²_n -PUFs is 30 × 147μm². Experimental results show that the C²_n -PUFs have reliability and randomness features, and improve information density about 89.6%.