Abstract：
The development of new anticounterfeiting solutions is a constant challenge and involves several research fields. Much interest is currently devoted to systems that are impossible to clone, based on the physical unclonable function (PUF) paradigm. In this work, a new strategy based on electrospinning and electrospraying of dye-doped polymeric materials is presented for the manufacturing of flexible free-standing films that embed simultaneously different PUF keys. The proposed films can be used to fabricate novel anticounterfeiting labels having three encryption levels: (i) a map of fluorescent polymer droplets, with random positions on a dense yarn of polymer nanofibers, (ii) a characteristic fluorescence spectrum for each label, and (iii) the unique speckle patterns that every label produces when illuminated with coherent laser light shaped in different wavefronts. The intrinsic uniqueness introduced by the manufacturing process encodes enough complexity into the optical anticounterfeiting tag to generate thousands of cryptographic keys. The simple and cheap fabrication process as well as multilevel authentication makes such colored polymeric unclonable tags a practical solution in the secure protection of goods in our daily life.
摘要：
开发新的防伪解决方案是一个不断的挑战，涉及多个研究领域。目前，人们对无法克隆的系统产生了极大的兴趣，基于物理不可克隆函数(PUF)范式。在这项工作中,提出了一种基于染料掺杂聚合物材料的静电纺丝和电喷雾的新策略，用于制造同时嵌入不同PUF键的柔性独立式薄膜。所提出的薄膜可用于制造具有三个加密级别的新型防伪标签：（i）荧光聚合物液滴图，在聚合物纳米纤维的致密纱线上随机定位，(ii)每个标记的特征荧光光谱，和(iii)当用在不同波前中成形的相干激光照射时,每个标签产生的独特散斑图案。制造过程引入的内在唯一性将足够的复杂性编码到光学防伪标签中以生成数千个加密密钥。简单而廉价的制造过程以及多级认证使这种有色聚合物不可克隆标签成为我们日常生活中安全保护货物的实用解决方案。
