Encryption techniques to the design of E-beam generated digital pixel hologram for anti-counterfeiting

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Detail(s)

Original languageEnglish
Pages (from-to)267-274
Journal / PublicationProceedings of SPIE - The International Society for Optical Engineering
Volume4677
Publication statusPublished - 2002

Conference

TitleOptical Security and Counterfeit Deterrence Techniques IV
PlaceUnited States
CitySan Jose, CA
Period23 - 25 January 2002

Abstract

The application of Digital Pixel Hologram (DPH) as anti-counterfeiting technology for products such as commercial goods, credit cards, identity cards, paper money banknote etc. is growing important nowadays. It offers many advantages over other anti-counterfeiting tools and this includes high diffraction effect, high resolving power, resistance to photo copying using two-dimensional Xeroxes, potential for mass production of patterns at a very low cost. Recently, we have successfully in fabricating high definition DPH with resolution higher than 2500dpi for the purpose of anti-counterfeiting by applying modern optical diffraction theory, to computer pattern generation technique with the assist of electron beam lithography (EBL). In this paper, we introduce five levels of encryption techniques, which can be embedded in the design of such DPHs to further improve its anti-counterfeiting performance with negligible added on cost. The techniques involved, in the ascending order of decryption complexity, are namely Gray-level Encryption, Pattern Encryption, Character Encryption, Image Modification Encryption and Codebook Encryption. A Hong Kong Special Administration Regions (HKSAR) DPH emblem was fabricated at a resolution of 2540dpi using the facilities housed in our Optoelectronics Research Center. This emblem will be used as an illustration to discuss in details about each encryption idea during the conference.

Research Area(s)

  • Anti-counterfeiting, Digital pixel hologram, Electronic beam technology, Optical security

Citation Format(s)

Encryption techniques to the design of E-beam generated digital pixel hologram for anti-counterfeiting. / Chan, Hau-Ping; Bao, Nai-Keng; Kwok, Wing-On; Wong, Wing-Hing.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4677, 2002, p. 267-274.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal