Research On Digital Watermarking Encryption Algorithm For QR Code

QR code is a two-dimensional matrix barcode developed by Denso Wave of Japan in 1994 for encoding information.It has the characteristics of high information density,all-round accessibility reading,fast recognition speed,strong error correction ability,and can encode different types of information.The QR code is powerful enough to decode without special lighting or cameras.It is cheap to produce and has no thresholds for production.It is easy to implement,so it is very popular and has a wide range of uses.However,potential attacks against QR codes or the use of QR codes also occur.Now that the media has reported many fraud incidents based on QR codes,the security certification and ownership protection of QR codes are very important.Aiming at the problem of insufficient anti-counterfeiting ability of QR codes,this paper proposes a QR code digital watermarking encryption algorithm based on cellular automata and Joseph ring.Main tasks are as follows:1)In order to guarantee the secure transmission of digital watermarks,the watermark is generally encrypted before being embedded to make the image unrecognizable and ensure that it can be decrypted using only the correct key.Cellular automaton is a good candidate for image pixel encryption due to its parallelism,homogeneity and unpredictability.At the same time,Joseph traversal can be used to modify the pixel position for achieving better encryption effect,which is easy to implement and fast to calculate.This paper designs a digital watermarking composite encryption algorithm combining cellular automata and Joseph traversal.This method not only has a large key space,which is very important to avoid exhaustive guessing of secret information;it also breaks the correlation between adjacent pixels of the watermark image and improves the security and robustness of the watermark algorithm.2)This paper applies a digital image composite encryption algorithm based on cellular automaton and Josephus traversal to the QR code ownership protection and security authentication fields,and proposes a QR code digital watermarking algorithm based on composite encryption.The algorithm first uses a composite encryption algorithm combining cellular automaton and Josephus traversal to encrypt the watermark image to increase the difficulty of cracking the watermark,and then combines the characteristics of the discrete cosine transform with low bit error rate,fast calculation speed,and singular value decomposition of stability and energy concentration to complete the watermark embedded.This method not only has better robustness against common image processing attacks,but also resists scanning attacks,and has higher practical value.3)The traditional QR code is composed of monotonous black and white modules,which has a small aesthetic appeal.The color QR code adds color information without changing the size of the traditional QR code shape,which improves the color singleness of the QR code,the information density is greater,and the color QR code has unlimited development potential.The proposed digital watermarking algorithm based on composite encryption is applied to the anti-counterfeiting of color QR codes.The simulation software Matlab shows that the algorithm is also applicable to color QR codes.It has good resistance to noise,filtering,JPEG compression,and geometric attacks.It can be used as a new measure for color QR code copyright protection and security authentication.