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The development of new anti-counterfeiting solutions is a constant challengeand involves several research fields. Much interest is devoted to systems thatare impossible to clone, based on the Physical Unclonable Function (PUF)paradigm. In this work, new strategies based on electrospinning andelectrospraying of dye-doped polymeric materials are presented for themanufacturing of flexible free-standing films that embed different PUF keys.Films can be used to fabricate anticounterfeiting labels having threeencryption levels: i) a map of fluorescent polymer droplets, with nondeterministic positions on a dense yarn of polymer nanofibers; ii) acharacteristic fluorescence spectrum for each label; iii) a challenge-responsepairs (CRPs) identification protocol based on the strong nature of the physicalunclonable function. The intrinsic uniqueness introduced by the depositiontechniques encodes enough complexity into the optical anti-counterfeiting tagto generate thousands of cryptographic keys. The simple and cheap fabricationprocess as well as the multilevel authentication makes such colored polymericunclonable tags a practical solution in the secure protection of merchandise inour daily life.

Flexible Physical Unclonable Functions based on non-deterministically distributed Dye-Doped Fibers and Droplets