Reconfigurable Multilevel Optical PUF by Spatiotemporally Programmed Crystallization of Supersaturated Solution
Reconfigurable Multilevel Optical PUF by Spatiotemporally Programmed Crystallization of Supersaturated Solution
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DOI：
10.1002/adma.202212294
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发表时间：
2023-04-19
影响因子：
29.4
通讯作者：
Hong, Sukjoon
中科院分区：
文献类型：
--
作者：
Kim, Youngchan;Lim, Jaemook;Hong, Sukjoon
物理不可克隆函数（PUF）通过提供具有不可复制特性的高级加密密钥而作为信息安全的替代方案出现，但是常规PUF的加密密钥不能从在制造阶段分配的加密密钥重新配置，并且随着数据集中的实体数量或加密密钥的长度增加，整个认证过程减慢。本文中，提出了一种基于过饱和溶液的PUF（S-PUF），其利用过饱和乙酸钠溶液的随机结晶来允许时间有效的分级认证过程以及密码密钥的按需重写性。通过经由时空编程的温度分布控制乙酸钠晶体的取向和平均晶粒尺寸，S-PUF现在除了散斑图案之外还包括两个全局参数，即衍射光束的旋转角度和发散度，以产生多级密码密钥，并且这些参数用作用于快速认证过程的每个实体的分类的前缀。与此同时，醋酸钠的可逆相变使密码密钥能够重复重新配置，这有望为下一代可回收的防伪平台提供新的可能性。
Physical unclonable functions (PUFs) are emerging as an alternative to information security by providing an advanced level of cryptographic keys with non-replicable characteristics, yet the cryptographic keys of conventional PUFs are not reconfigurable from the ones assigned at the manufacturing stage and the overall authentication process slows down as the number of entities in the dataset or the length of cryptographic key increases. Herein, a supersaturated solution-based PUF (S-PUF) is presented that utilizes stochastic crystallization of a supersaturated sodium acetate solution to allow a time-efficient, hierarchical authentication process together with on-demand rewritability of cryptographic keys. By controlling the orientation and the average grain size of the sodium acetate crystals via a spatiotemporally programmed temperature profile, the S-PUF now includes two global parameters, that is, angle of rotation and divergence of the diffracted beam, in addition to the speckle pattern to produce multilevel cryptographic keys, and these parameters function as prefixes for the classification of each entity for a fast authentication process. At the same time, the reversible phase change of sodium acetate enables repeated reconfiguration of the cryptographic key, which is expected to offer new possibilities for a next-generation, recyclable anti-counterfeiting platform.