Efficient scheme for secret hiding in QR code by improving exploiting modification direction

Peng Cheng Huang, Yung Hui Li, Chin Chen Chang, Yanjun Liu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


QR codes as public patent are widely used to acquire the information in various fields. However, it faces security problem when delivering the privacy message by QR code. To overcome this weakness, we propose a secret hiding scheme by improving exploiting modification direction to protect the private message in QR code. The secret messages will be converted into octal digit stream and concealed to the cover QR code by overwriting the cover QR code public message bits. And the private messages can be faithfully decoded using the extraction function. In our secret hiding scheme, the QR code public message still can be fully decoded publicly from the marked QR codes via any standard QR Code reader, which helps to reduce attackers’ curiosity. Experiments show that the proposed scheme is feasible, with high secret payload, high security protection level, and resistant to common image post-processing attacks.

Original languageEnglish
Pages (from-to)2348-2365
Number of pages18
JournalKSII Transactions on Internet and Information Systems
Issue number5
StatePublished - 31 May 2018


  • Exploiting modification direction
  • QR code
  • Secret hiding


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