title: Cryptography based on the absorption/emission features of multicolor semiconductor nanocrystal quantum dots.
abstract: Further to the optical coding based on fluorescent semiconductor quantum dots (QDs), a concept of using mixtures of multiple single-color QDs for creating highly secret cryptograms based on their absorption/emission properties was demonstrated. The key to readout of the optical codes is a group of excitation lights with the predetermined wavelengths programmed in a secret manner. The cryptograms can be printed on the surfaces of different objects such as valuable documents for security purposes.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhou
authors.forename: Shoude
authors.initials: S
authors.lastname: Chang
authors.forename: Chander
authors.initials: C
authors.lastname: Grover