The physical unclonable functions (PUFs) are getting more applications in information security. However, as a typical strong PUF, the arbiter PUF has deterministic logic, so adversaries could use model attacks to break it. On the other hand, although weak PUFs are immune to model attacks, they cannot pro-vide as many challenge-response pairs as arbiter PUFs. A nondeterministic logic based arbiter PUF was proposed. By combining the arbiter PUF with the weak PUF, partial Boolean relations within the proposed PUF were configured by the nondeterministic outputs of the weak PUF, so its security against model attacks is effectively improved. Meanwhile, experiments in FPGA also show the proposed PUF has good random-ness 50.6% and stability 94.5%.%物理不可克隆函数(physical unclonable function,PUF)在信息安全领域的应用日益广泛.然而,仲裁型PUF作为一种典型的强PUF,因逻辑确定而易被建模攻击破解;弱PUF虽然对建模攻击免疫,但无法提供较多激励响应对.为解决此问题,提出了一种非确定性仲裁型PUF,通过结合仲裁型PUF和弱PUF,使非确定性仲裁型PUF的部分布尔逻辑关系取决于弱PUF的不确定性输出,以提高该PUF的逻辑不确定性,进而提高了其抗建模攻击能力.同时,在FPGA上的实验也表明,所提设计具有较高的随机性(50.6%)和稳定性(94.5%).
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