Research On Information Encryption Method Based On Color Barcode

With the rapid development of information science and technology as well as the continuous upgrading of mobile terminal equipment,bar code technology shows high application value in many fields,such as e-commerce,logistics management,mobile payment,urban transportation,with its own advantages such as high reliability,large information capacity,strong error correction ability,low production cost,etc.However,with the wide application and in-depth development of QR code,security problems such as privacy disclosure,virus transmission and personal property loss have also broken out,which has attracted the attention of the state and society.How to achieve efficient and secure transmission of bar code information has also become one of the current key research topics.Therefore,this paper studies the transmission security of color bar code,and designs two kinds of color bar code encryption system based on image encryption technology and secret sharing mechanism respectively.Aiming at the application scene of several large-capacity color bar codes,this paper designs a color image encryption algorithm based on DNA coding calculation,and combines data encryption and information steganography technology to realize a multi-level encryption system based on color bar codes.The system takes into account the security of source information and bar code data,in which the data encryption method initially ensures the security of source information,and the introduction of steganography technology further improves the confidentiality of bar code data and the encryption and decryption speed of uniform bar code.The designed image encryption algorithm provides a great security guarantee for the carrier image transmitted in the public channel.In order to deal with brute force attacks,the encryption and decryption keys of the system are generated by the cascade iteration of two hyperchaotic systems,and the resulting cryptographic matrix is highly random and sensitive.The proposed image encryption algorithm is based on DNA coding and decoding,and adopts scrambling-diffusion encryption structure,which not only provides high confidentiality,but also achieves low operation loss.The experimental results show that the average correlation coefficient between pixels of the encrypted image to be transmitted is as low as 0.0044,and the average value of information entropy is close to 7.9993.At the same time,the average values of NPCR(Number of Pixels Change Rate)and UACI(Unified Average Changing Intensity)under differential test are 0.9961 and 0.3346 respectively,and the total key space of the system is as high as 2⁴⁶⁸,which proves that the system has strong ability to resist exhaustive attacks,statistical attacks and differential attacks.In addition,the average encryption time of color bar code in this system can be as low as 0.3257 seconds per sheet.Compared with other bar code encryption systems,it achieves lower encryption time loss under the condition of bar code with the same information capacity.Considering the application scenario of a single color bar code,this paper implements a color bar code encryption system based on secret sharing mechanism.The system takes the color block as the basic operating unit,the output encrypted image is presented in the way of color bar code,and the decryption algorithm only involves the XOR operation with low computation,which provides a design idea for the bar code encryption mechanism of mobile devices.The secret sharing mechanism,the encryption method of one-time key and the diffusion algorithm between color blocks provide high security for barcode data.The experimental results show that any shared secret map of less than 5 pieces in the same round or 5 shares which is not in the same round can not restore the barcode data.At the same time,the average correlation coefficient between the adjacent color blocks of the cipher images can be as low as0.0204 and 0.0140 respectively under the color bar code version of 7 and 20,which proves that the security of the system is at a high level.In addition,under the color bar code versions of version 5,version 7,version 20 and version 30,the average decryption time of the system can be as low as 0.015624 seconds,0.031242 seconds,0.125084seconds and 0.281119 seconds,respectively,which is at least 30%shorter than the encryption time.It is proved that the system has lower computational loss and is more suitable for mobile devices with low computing power.