Secure and useful QR-code system based on reversible information hiding

提出了一种基于二值图像压缩的可逆信息隐藏技术，研究了一种评价信息隐藏技术的隐写分析方法。研究了QR码的三种信息隐藏技术。一种是基于可逆信息隐藏的方法，另两种是将待嵌入的信息放在QR码的终止码之后，用湿纸码来表示。此外，研究了基于RSA公钥密码体制和QR码信息隐藏技术的考试成绩安全发布系统。

A technique for reversible information hiding that is based on compression for binary images was proposed and a method for steganalysis to evaluate information hiding techniques were studied. Three information-hiding techniques for QR codes were investigated. One of them is based on the proposed reversible information hiding, and other two methods are based that message we want to embed is put after the terminate code of QR code, and Wet paper code is used to represent the message. In addition, the secure release system of examination score which is based on RSA public key crypto system and information hiding for QR code was studied.