Presentation Information
[N-2-23]Evaluation of reproducible physical random number generation using semiconductor lasers
◎Kanato Toshihiro1, Ten-yu Hokari1, Chin-Hao Tseng1, Tomoki Yamagami1, Atsushi Uchida1 (1. Saitama Univ.)
Keywords:
physical random number generation,physical unclonable function,semiconductor laser,phase modulation,security
Random numbers are essential for information security and simulations, and fast, unpredictable generation methods are required. Pseudo-random numbers are fast, but their reproducibility and periodicity cause predictability issues. Physical random numbers have high randomness, but are generally slow to generate. Therefore, semiconductor laser chaos is a promising high-speed source. For physical unclonable functions (PUFs) and hash functions, reproducibility for the same input is important. In this study, we evaluated output waveform reproducibility in a semiconductor laser with optical feedback when the same random rectangular-wave signal was repeatedly input. The signal was applied by phase modulation of the feedback light, and the optical intensity waveform was measured. Reproducibility was quantified by the cross-correlation between two output waveforms for the same input. The two waveforms were similar, with a correlation value of 0.969. We examined the effect of optical feedback power: the correlation first increased, reached a maximum, and then decreased. These results show that optical-feedback adjustment can improve the reproducibility of the semiconductor laser output.