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CRPUF: A modeling-resistant delay PUF based on cylindrical reconvergence

机译：CRPUF：基于圆柱收敛的抗建模延迟PUF

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Physical Unclonable Functions (PUFs) are devices which exploit manufacturing variability to uniquely distinguish individuals, thus preventing cloning for malicious purposes. With the increasing demand for low-cost devices, PUF designs which can effectively combine small silicon area and power consumption with high resistance to attacks have become of great interest. Unfortunately, many delay-based PUFs have revealed security weaknesses, making them less useful in such domains. This paper presents a novel delay-based strong PUF, the CRPUF (Cylindrical Reconvergence PUF). CRPUF is based on a carefully designed cylindrical XOR fabric, which allows for a large number of delay paths, thus producing a large combination of challenge-response pairs (CRPs) with relatively low transistor count. Simulations based on circuit delay variability models were performed to evaluate CRPUF with respect to well-known delay PUFs. The simulation results were then validated against an FPGA prototype to show that the desirable properties of the CRPUF can be obtained in a realistic physical implementation. Experiments show that CRPUF has Hamming Distance, Hamming Weight and Entropy comparable to the best results published so far, with acceptable levels of Bit Error Rate. Moreover, experiments also show that CRPUF is much more resistant to modeling attacks than other delay and some memory-based PUFs, making it a good candidate to systems which have stringent cost and security constraints.
机译：物理不可克隆功能（PUF）是一种利用制造可变性来唯一区分个人的设备，从而可以防止出于恶意目的进行克隆。随着对低成本器件的需求不断增长，可以有效地将小硅面积和功耗与高抗攻击性结合起来的PUF设计已引起人们极大的兴趣。不幸的是，许多基于延迟的PUF都揭示了安全漏洞，从而使其在此类域中的用处不大。本文介绍了一种新型的基于延迟的强PUF，即CRPUF（圆柱再收敛PUF）。 CRPUF基于精心设计的圆柱XOR结构，该结构允许大量的延迟路径，从而以相对较少的晶体管数量产生了挑战-响应对（CRP）的大型组合。进行了基于电路延迟可变性模型的仿真，以针对已知的延迟PUF评估CRPUF。然后，针对FPGA原型对仿真结果进行了验证，以表明可以在现实的物理实现中获得CRPUF的理想特性。实验表明，CRPUF的汉明距离，汉明权重和熵与迄今为止公布的最佳结果相当，并且误码率处于可接受的水平。此外，实验还表明，CRPUF比其他延迟和某些基于内存的PUF更能抵抗建模攻击，使其成为具有严格成本和安全约束的系统的理想之选。

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