A method and system are provided. The method involves generating a plurality of nanoparticles, isolating fluorescent nanoparticles, embedding the fluorescent nanoparticles in a resin and applying the resin on a product. The system is for product authentication and includes a light source, fluorescence nanoparticles, a detector and a resin for applying on a product. Furthermore, a non-transitory computer readable medium encoded with codes is provided to direct the system to carry out the method.