Presentation Information
[N-2-01]Oblivious transfer using common-signal-induced synchronization in semiconductor lasers with polarization switches
◎Taiga Yahagi1, Yusuke Fujii1, Mika Sekiguchi1, Tomoki Yamagami1, Atsushi Uchida1 (1. Saitama Univ.)
Keywords:
Secure key distribution,Lasers,Chaos,Oblivious transfer,Polarization modulator
Secure computation is a technology in which multiple users obtain only the calculation result of a function while keeping their inputs secret from each other. It can be implemented by using garbled circuits and oblivious transfer. In oblivious transfer, a receiver can decrypt only some of multiple messages, and the sender cannot know which message the receiver has selected. In this study, we aim to implement oblivious transfer by secure key distribution using common-signal-induced synchronization in semiconductor lasers in order to increase the processing speed of secure computation by using the high speed of light. Specifically, we experimentally implement delay-path switching using a polarization switch and numerically evaluate common-signal-induced synchronization including phase modulation and intensity modulation. We generate secret keys from the obtained synchronized waveforms and perform 1-out-of-2 oblivious transfer. As a result, Bob can correctly decrypt only the selected message with a bit error rate of 0. These results show that common-signal-induced synchronization in semiconductor lasers using a polarization switch can be used for oblivious transfer.