内建自调整的仲裁器物理不可克隆函数

Built-in Self Adjustable Arbiter PUF

针对仲裁器物理不可克隆函数(PUF)响应随机性难以保证的问题,提出具有内建自调整功能的仲裁器PUF设计,该设计包含激励产生模块、可调仲裁器PUF模块和自调整模块.首先在传统仲裁器PUF上增加由调整信号控制的时延调节电路,实现可调仲裁器PUF结构;然后用线性反馈移位寄存器实现激励产生模块,生成用于测试PUF随机性的激励;最后加入自调整模块,通过分析PUF响应的随机性自动调整时延调节电路的调整信号,提高可调仲裁器PUF的随机性.实验结果表明,经过自调整,在FPGA上实现的多个所提仲裁器PUF,其随机性的平均值为50.62%,标准差仅为0.5%,随机性得到有效提高.

A built-in self adjustable arbiter physical unclonable function(PUF)is proposed to solve the problem that the responses of arbiter PUF may not be random enough.The proposed design is consisted of challenge generation module,adjustable arbiter PUF,and self-adjustment module.Firstly,specific buffers,controlled by adjustment signals,are inserted into arbiter PUF to construct the adjustable arbiter PUF.Then,the challenge generation module based on LFSR generates random challenges to test the randomness of PUF.By analyzing the randomness,the self-adjustment module automatically sets the adjustment signals to improve the randomness.The proposed PUFs are implemented in FPGA.The experimental results show that the average randomness is50.62%,and the standard deviation of randomness is0.5%.Compared with previous work whose standard deviation is3.4%,the proposed PUF effectively improves the randomness.