Fast true random generator in FPGAs

Most hardware "True" Random Number Generators (TRNGs) take advantage of the thermal agitation around a Flip-Flop metastable state. In Field Programmable Gate Arrays (FPGAs), the classical TRNG structure uses two clocks, either from a PLL or from ring oscillators, in order to sample one by the other This creates good TRNGs albeit limited infrequency by the interference rate which cannot exceed a few Mbit/s. This article presents an architecture allowing higher bit rates while maintaining provable unconditional security. This requirement becomes stringent for secure communication applications such as the cryptographic Quantum Key Distribution (QKD) protocols. The proposed architecture is very simple as it is based on an open loop structure without any specific component such as PLLS.