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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 number has important application value in the fields of cryptography, communication and national security. The traditional physical random number generator is limited by the bandwidth of entropy source (such as thermal noise), the code rate is only on the order of Mb / s. In recent years, with the appearance of broadband photon entropy sources (such as chaotic laser, amplification of spontaneous emission noise), many high-speed random number generation schemes have been proposed by researchers. Among them, chaotic laser has drawn great attention because of its high bandwidth, large amplitude and easy integration, and is widely used in the generation of Gb / s physical random number. Combining with the research status at home and abroad, this paper summarizes the scheme of generating physical random numbers based on chaotic laser, analyzes the advantages and disadvantages of each scheme, summarizes the research hotspots of current chaos physical random number generator and points out its possible future Direction of development.