Novel Randomized & Biased Placement for FPGA Based Robust Random Number Generator with Enhanced Uniqueness

Novel Randomized Placement for FPGA Based Robust ROPUF with Improved Uniqueness

“…The proposed approach has been used to increase the frequency difference (∆f ) such that all the ring oscillator pairs should satisfy (9), because the effect of noise (∆f ) in frequency difference can be compensated when the frequency difference is comparatively large. Therefore highly separated ring oscillator frequencies are preferred to improve the reliability.…”

“…Furthermore, the approach is limited to temperature variations. Later, the approach has been modified to improve the randomness and uniqueness along with reliability [9]. The authors additionally, employ the randomized placement to enhance the uniqueness, whereas randomness is improved using random frequency allocation with an LFSR design.…”

“…Rewriting (7) in (8). (8), it is clear that reliable condition (no frequency sign change) can be achieved by either (9) or (10).…”

“…|∆f | > (|∆fε t + ∆fε m |) (9) ∆f * (∆fε t + ∆fε m ) > 0 (10) The condition (9) itself is a complete one, but if (9) does not satisfy then (10) can be checked for stability.…”

“…Five steps have been used to generate ROPUF place & route constraints. As we have modified the ring oscillator design by inserting a latch circuit, therefore we have omitted the routing path validation scheme from the previous work [9]. The following steps have been used during the second phase to select suitable ring oscillator locations, which improves χ.…”