Unclonable Micro‐Texture with Clonable Micro‐Shape towards Rapid, Convenient, and Low‐Cost Fluorescent Anti‐Counterfeiting Labels

Abstract

methods rely on clonable labels produced by a deterministic process. These labels are low-cost but their simple and repeatable preparation processes and regular decoding mechanisms are exploitable by counterfeiters. [4,5] Many of the more complex and safer anti-counterfeiting labels (such as high-end RFID labels with large number of logic gates) cannot become standard on some commonly used products due to their high cost. [5,6] Anti-counterfeiting labels with physical unclonable functions (PUF) are a feasible solution to the above shortcomings. Since the introduction of the PUF in 2002, [7] many anticounterfeiting labels with different PUF characteristics have been developed, such as unique bionic fingerprint pattern with random surface topography; [8][9][10] randomly distributed nanoparticle pattern, including flower-like patterns with random pinning points, [11] nanowires coated with fluorescent dyes in random positions, [12] etc. In addition, researchers have prepared many types of PUF anticounterfeiting labels with optical response. For example, Cheng et al. [13] reported a multicolor plasma nanopaper with random Raman intensity distribution, He et al. [14] designed multi-mode structural-color anti-counterfeiting labels composed of randomly arranged nanospheres, and Leem et al. [15] developed edible silk film labels with random light response. To improve the capabilities and speed of unclonable-pattern recognition,

Bright Cyan‐Emissive Copper(I)‐Halide Single Crystals for Multi‐Functional Applications

“…Multi-functional luminescent materials with broad response to different excitation sources afford the various applications in the solid-state lighting device, [1][2][3][4][5][6][7][8][9][10][11][12][13] anti-counterfeiting, [14][15][16][17][18][19] optical refrigeration, [20,21] and X-ray detection. [22][23][24][25][26][27][28] Recently, anti-counterfeiting has become a serious global issue in our daily lives, commercial trade, intellectual property protection, document encryption, etc.…”

Materials with Tunable Optical Properties for Wearable Epidermal Sensing in Health Monitoring

“…[197] Security labels with physically unclonable function (PUF) have been proven to be one of the most reliable ways to protect the data security, which may offer a practical solution to be integrated with wearables for avoiding the privacy infringement. [198] This is because that the PUF features within the security labels that are impractical to duplicate can be easily converted to binary-bit codes, enabling unbreakable encryption. [199] Furthermore, We have already illustrated two vial strategies (deep learning and computer visions) to collect, analyze, and decode the output data during the process of manufacturing, distribution, supply, and end users.…”

Random fractal-enabled physical unclonable functions with dynamic AI authentication

“…The security label should also survive the inevitable ambient exposure in daily life 18,37 , such as mechanical abrasion, aqueous corrosion, and contamination. All these can be simply implemented by covering a protective layer like SiO2 or Al2O3 for the high-temperature situations, PMMA for the daily temperature situations, and so forth on the PUF tag according to the usage situations.…”

“…An automated image identification is appropriate for decoding the PUF tags. The conventional image processing algorithms are based on the matching of feature points in library files one by one 1,37 . Apart from the relatively tedious matching time, their performance also strongly depends on the image orientation and quality 36,38 .…”