Revealing the Secret Parameters of an FPGA-Based “True” Random Number Generator

A new response system is suggested to show the security vulnerabilities of an FPGA-based chaotic “true” random number generator (RNG). The auto-synchronization method is used to justify the success of the response system. The hidden parameter of the chaotic RNG is revealed when the design of the RNG is open to everyone and a limited scalar time series can be monitored from the chaotic RNG. Experimental results prove the applicability of the response system in a way of estimating next bit while the same bit stream of the RNG can be reproduced.