Dual-metastability fpga-based true random number generator

A novel concept of a true random number generator (TNRG) based on two metastable flip-flops in a FPGA circuit is introduced. Most of metastable based TRNG solutions are based on the assumption of a D-latch (flip-flop) state´s uncertainty which is the source of randomness. In the proposed approach direct proximity of the metastable point is not necessary. Difference of the time of response of a pair of nearly metastable flip-flops lies upon the proposed circuit´s principle of operation. It can be implemented in common programmable FPGA or CPLD circuits ensuring randomness quality-passing NIST, Diehard and Matlab tests.