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The paper deals with true random number generators using a set of ring oscillators as proposed by Sunar et al. in 2007. The original generator has been recently enhanced by Wold and Tan by introducing flip-flops at the output of each ring. We show in the first part of the paper that both original and enhanced architectures have exactly the same behavior when composed of ideal components (they have...
Random number generators are one of basic cryptographic primitives used in cryptographic protocols. Most of true random number generators in field programmable gate arrays (FPGAs) employ the timing jitter from ring oscillator clocks as a source of randomness. The paper analyses the jitter generated in ring oscillators and it uses a simple physical model of jitter sources to show that the random jitter...
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