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Two-Level QR Code for Private Message Sharing and Document Authentication

Iuliia Tkachenko 1 William Puech 1 Christophe Destruel 2 Olivier Strauss 1 Jean-Marc Gaudin 2 Christian Guichard 2 
1 ICAR - Image & Interaction
LIRMM - Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier
Abstract : The quick response (QR) code was designed for storage information and high-speed reading applications. In this paper, we present a new rich QR code that has two storage levels and can be used for document authentication. This new rich QR code, named two-level QR code, has public and private storage levels. The public level is the same as the standard QR code storage level; therefore, it is readable by any classical QR code application. The private level is constructed by replacing the black modules by specific textured patterns. It consists of information encoded using q-ary code with an error correction capacity. This allows us not only to increase the storage capacity of the QR code, but also to distinguish the original document from a copy. This authentication is due to the sensitivity of the used patterns to the print-and-scan (P&S) process. The pattern recognition method that we use to read the second-level information can be used both in a private message sharing and in an authentication scenario. It is based on maximizing the correlation values between P&S degraded patterns and reference patterns. The storage capacity can be significantly improved by increasing the code alphabet q or by increasing the textured pattern size. The experimental results show a perfect restoration of private information. It also highlights the possibility of using this new rich QR code for document authentication.
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Submitted on : Saturday, June 25, 2016 - 1:53:42 PM
Last modification on : Friday, August 5, 2022 - 3:02:19 PM




Iuliia Tkachenko, William Puech, Christophe Destruel, Olivier Strauss, Jean-Marc Gaudin, et al.. Two-Level QR Code for Private Message Sharing and Document Authentication. IEEE Transactions on Information Forensics and Security, Institute of Electrical and Electronics Engineers, 2016, 11 (3), pp.571-583. ⟨10.1109/TIFS.2015.2506546⟩. ⟨lirmm-01337360⟩



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