面向高速保密通信的激光混沌物理随机数发生器研究进展

Research Progress in Physical Random Number Generator Based on Laser Chaos for High-Speed Secure Communication

物理随机数在密码学、通信及国家安全等领域具有重要应用价值。传统的物理随机数发生器受限于熵源(如热噪声等)带宽的限制,码率仅处于Mb/s量级。近年来,随着宽带光子熵源(如混沌激光、放大自发辐射噪声)的出现,研究学者提出了众多高速随机数产生方案。其中,混沌激光由于其高带宽、大幅度、易集成等特性,获得了人们的极大关注,被广泛应用于Gb/s量级物理随机数的产生。结合国内外研究现状,对基于混沌激光的物理随机数产生方案进行了综述,分析了各方案的优势及不足,归纳总结了当前混沌物理随机数发生器的研究热点,并指出了其未来可能的发展方向。

Physical random numbers have great application value in the fields of cryptography, communication and national security. Conventional physical random number generators are limited by the low bandwidth of applied entropy sources such as thermal noise and thus have low bit rates at Mb/s order. With the appearance of wideband photonic entropy sources （e.g. chaotic laser and amplified spontaneous noise） in recent years, lots of schemes for high-speed random number generation are proposed. Among them, chaotic laser attracted many attentions due to its merits such as high bandwidth, large amplitude fluctuation and ease of integration. According to the international research situation, physical random number generation schemes based on chaotic laser are overviewed. Through analyzing their own advantages and disadvantages, current hot spots in the studies are summarized and some possible development orientations in the future are pointed out.