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This paper presents a refined stochastic model of the delay-chain based true random number generator (DC-TRNG) and its application. DC-TRNG is a true random number generator for FPGAs that utilizes time-to-digital conversion (TDC) to accurately determine the position of the ring-oscillator jittery signal edge. Our stochastic model employs precise time characterization of the carry-chains that are used for TDC in the DC-TRNG. In order to determine lower bounds of the estimated min-entropy, thedoi:10.1109/iscas.2018.8351222 dblp:conf/iscas/GrujicR0V18 fatcat:uncnqqwz4bdahnpvp6lxj6z55e