Attack on a Microcomputer-Based Random Number Generator Using Auto-synchronization

A novel attack system is proposed to reveal the security weaknesses of a microcomputer-based random number generator (RNG). Convergence of the attack system is proved using auto-synchronization. Secret parameters of the microcomputer-based RNG are revealed where the available information are the structure of the RNG and a scalar time series observed from the chaotic system used as the seed of the RNG. Simulation results verifying the feasibility of the attack system are given such that, next bit can be predicted while the same output sequence of the RNG can be generated.