Secret Message CDMA Multiplexing via QR Codes
Chih‐Hung Lee, Kun-Sheng Sun, Yun-Qiao Wang, Ji-Hwei Horng, Chin‐Chen Chang · 2022
In this paper, we propose an innovative secret message multiplexing scheme for QR code based on the technology of Code Division Multiple Access (CDMA). Multiple secret messages distributed for several participants are encoded into a CDMA codeword through CDMA multiplexing and then embedded in the padding region of the cover QR code. In this way, everyone can read the public message of marked QR code by any standard QR code reader, but only the authorized user can decode the dedicated hidden secret message using a correct secret key. This feature helps the proposed scheme to possess strong data security. Meanwhile, the robust error correction capacity of QR code is still maintained. The proposed secret message multiplexing scheme is efficient and feasible for private message delivery applications.