Abstract

In this paper, we introduce a method for firing nearly invisible, two-dimensional (2D) code on ceramic product surfaces and a 2D code-reader system, equipped with a smartphone and an ultraviolet (UV) light, to extract encoded character information (public and encrypted secret information). We created the nearly invisible 2D code to add character information to ceramic surfaces without impairing the ceramics’ colors and patterns as much as possible. When irradiated by UV light, the code is visible to the naked eye, emitting a pale-blue light. The 2D code-reader system uses a smartphone camera and a 2D code-recognition algorithm to extract character information from the 2D code reflected on the smartphone’s display. However, only smartphones that have access to digital keys can decrypt the encrypted secret information. We successfully fired this 2D code on ceramic surfaces.

Highlights

  • 1.1 Background and targetToday, adding 2D codes onto the surfaces of everyday products, such as home appliances, foods, and tools, is not uncommon because of the proliferation of codes

  • We propose a method of baking nearly invisible, secure 2D code (called Secure Quick Response Codes, or SQRC (1)) that can store public and encrypted secret information in ceramic surfaces

  • For an SQRC of 1.5 cm[2] to be fired onto ceramic surfaces, the authors searched for a best SQRC version that could store as much public and encrypted secret information as possible while enabling the easy extraction of the stored information

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Summary

A Method of Firing Nearly Invisible 2D Code with Public and Secret

Masaki Fujikawaa,*, Yui Uenoa, Daiji Osawab, Eigo Nishimurac, Koutaro Gomid, Hideki Iwasakid, Toshiaki Haradae, and Naoki Adachie aKogakuin University, Nishi-Shinjyuku 1-24-2, Tokyo 163-8677, Japan bTakane Silk Co., Ltd., Takane-cho 4-6, Tajimi, Gifu Pref. 507-0078, Japan cScience Park Corporation, Iriya 3-1649-2, Zama, Kanagawa Pref. 252-0024, Japan dYamaka Shoten Ltd., Izumi-cho Kujiri 547, Toki, Gifu Pref. 509-5142, Japan eGifu Prefectural Ceramics Research Institute, Hoshigadai 3-11, Tajimi, Gifu Pref.

Background and target
Forming 2D code on ceramics
Public and secret information
Access control of secret information
SQRC printing and firing
Handling a UV light source
Identification of verifier
Conclusions
Full Text
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