Reconfigurable Optical Physical Unclonable Functions Enabled by VO2 Nanocrystal Films

• DOI: 10.1021/acsami.1c20803
• Publication Date: 2022-01-19T14:48:37Z
• Authors: Zaixin Gan; Feiliang Chen; Qian Li; Mo Li; Jian Zhang; Xueguang Lu; Lu Tang; Zhao Wang; Qiwu Shi; Weili Zhang; Wanxia Huang
• Keywords: Physical unclonable function; Robustness

Optical physical unclonable function (PUF) is one of the most promising hardware security solutions, which has been proven to be resistant machine learning attacks. However, disordered structures traditional optical PUFs are usually deterministic once they manufactured and therefore exhibit fixed challenge-response behaviors. Herein, a reconfigurable PUF (R-PUF) proposed demonstrated by using reversible phase transition behavior VO2 nanocrystals combined with TiO2 nanoparticles. Both simulation experiment results show that near-infrared laser speckle pattern R-PUF can almost completely altered after nanocrystals, resulting in reproducible response. The similarity response speckles shows an obvious hysteresis loop during rise drop temperature, providing simple way regulate control behaviors R-PUF. More importantly, hysteretic characteristic provides new dimension describe besides speckle, effective improve encoding capacity PUFs. employed as primitive for high robustness high-security authentication encryption.