Research On Design Of Secret Image Sharing Scheme Based On QR Codes

With the rapid development of Internet and information technology,the security of the information,which is stored,managed and transferred in an open network environment,faces severe challenges.As an important research direction in the field of information security,digital image storage technology,a cryptographic technology,shares and embeds secrets into carrier images for secure storage and transmission,which can effectively solve the security problems faced by sensitive information.As a typical two-dimensional bar code,QR code is widely applied in many fields such as e-commerce,mobile payment and logistics due to its high capacity,high density and strong error correcting capability,and has gradually become an industry standard for information interaction.Besides,the non-contact one-way information interaction mode of QR code provides an effective way for communication in times of emergency,and shows extensive potential for application in the military field.Oriented on military practical application requirements,this paper analyzes the codec principle of QR code and designs image sharing scheme based on QR code,to ensure the protection of secret information and the readability of QR code.The specific research content is as follows:1.Research on image sharing scheme model based on QR codeWe refer to the international standard of QR code,study the secret payload capability of each link in the process of QR code reading,and summarize the embedding method of secret share in the carrier image.Eventually,the design goal of image sharing scheme is clarified,the idea of “first sharing and then embedding” for model design is proposed,and the model of image sharing scheme is established based on QR code.2.Design of image sharing scheme based on error correction mechanism of the QR codeUnder the premise of the readability of the QR code,we design an efficient image sharing scheme by introducing the Hamming code based on the error correction mechanism of the QR code in order to embed the secret information whose bit number exceeds the upper limit of the error correction capability.The scheme divides the secret information into two parts,and uses the secret sharing algorithm based on XOR to share and embed the first part of secret information.Under the constraint of the QR code error correction upper limit,the second part of the secret information is shared and embedded by constructing the Hamming code with the partial carrier pixels in the same coordinate.Finally,theoretical analysis and experimental results show that the scheme can embed more secret information and meanwhile ensure the readability of the QR code.3.Design of image sharing scheme based on module identification of the QR codeIn order to improve the robustness of QR codes shares and balance the secret load capability,an image sharing scheme with strong robustness,moderate secret load and blind information extraction is designed based on the module recognition characteristics of QR codes,Hamming codes and wet paper codes.The proposed scheme first defines a 3×3 module identification unit that binds its central location information to the carrier pixels,while the surrounding eight locations store the same secret information.Then,based on the random matrix block,we divide the secret information into two parts and share the first part of secret information with XOR-ed secret sharing algorithm.The column number of the element to be modified is used as the location index,and sharing and blind embedding the second part of secret information are realized by using the Hamming code error correction principle and the wet paper coding characteristics.Furthermore,we embed each row element of secret random matrix block into the corresponding carrier QR code to generate QR code shares based on the strong robustness of information storage pattern.The theoretical analysis and experimental results show that the secret information can still be extracted and restored blindly under the interference of general intensity,with high secret loading capacity of each carrier pixel.4.Design of image sharing scheme based on color space of the QR codeTo ensure the compatibility between color QR codes and binary QR codes,we design an image sharing scheme with large secret load by setting threshold to control the embedded data in R,G and B channels of QR codes.By Shamir(k,n)threshold secret sharing algorithm,the scheme divides secret information into three parts and controls the secret information sharing process by setting threshold,so that the threshold discrimination result of secret share is consistent with the carrier pixel at the embedding location.Afterwards,we embed the three secret shares in R,G and B channels of the carrier images respectively,and then generate a color QR code share read by a binary QR decoding terminal.The theoretical analysis and experimental results show that the color QR codes not only generated by this scheme can load gray secret images three times of the capacity of carrier image but also realizes high recognition efficiency.