Research On QR Code Security Technology Based On AES Algorithm And Digital Watermark

As a carrier tool for information storage and transmission,It is widely used because of its fast reading,high storage capacity and strong fault tolerance.However,the QR code encoding and decoding algorithm and the RS error correction algorithm are open source,and the information is not encrypted.so the information carried by the QR code can be read at will.The problem of information leakage caused by QR codes has become more and more serious,and the development prospects have been greatly restricted.Therefore,it is great significance to explore safe and efficient QR code technology.This article aims to use data encryption technology and digital watermarking technology to solve the security problems of QR codes,Generate a QR code that can be used safely.The main research work is as follows:1?An improved AES algorithm is proposed for the encryption of QR code Source infor-mation.In view of the security problems caused by fixed initial key and the mutual derivation of the keys.The algorithm uses the Logistic chaotic map and the Chebyshev chaotic map to generate a compound random sequence as the initial key of the AES algorithm grouping.And insert a random sequence in the key expansion process to destroy the derivability of the round key.Complete "one time one key" dynamic AES encryption.The experimental results and security analysis prove that the improved AES algorithm has better security performance.2?A secure QR code scheme is designed based on the combination of improved AES algorithm and digital watermark.On the basis of analyzing the characteristics of QR code images,taking the visual effects of QR codes and watermark robustness as reference standards,a blind watermarking algorithm based on DWT-DCT-SVD is designed.The watermarking algorithm has good robustness.The watermark information can be extracted Under the attacks of noise and geometry.Then,it is proposed by practicality that the QR code generated by the improved AES algorithm is used as the watermark information.Design an efficient and coupled secure QR code scheme that can not only ensure the security of the information carried by the QR code,but also achieve the anti-counterfeiting and anti-copying of the QR code.3?A secure QR code encoding and decoding system is realized on the PC side Through MATLAB language.The system has a secure QR code encoding and decoding function.In addition,ordinary QR code encoding and decoding and beautification functions have also been added to make the system more practical.Performance tests show that secure QR codes have high practical value.