Research And Application Of Digital Image Transmission Technology For Minimum Steganography

With the wide application and popularization of network and computer technology in many fields such as e-commerce,e-government,finance,industrial control,military industry,national defense,medical care,railway,aviation,communication network and mobile Internet,the risk and vulnerability of information security are becoming more and more serious.Information hiding technology is one of the research orientation in the field of information security.The advantage of minimum steganography is that it builds a special mapping relationship between the original carrier and the secret information,and the original carrier itself is not affected.Therefore,minimum steganography is also called coverless steganography.The embedding capacity of coverless steganography is the size of secret information derived from the mapping relationship between cover image and stego image.Based on the existing information hiding algorithms and techniques,this paper proposes two kinds of coverless steganographic algorithms for color images.The main work of this paper is as follows:(1)Summarized the commonly used information hiding algorithms and analyzed the shortcomings of the current mainstream algorithms.the embedded capacity is limited by the size of the carrier itself and is easy to be detected and attacked by third-party steganographic analysis tools.(2)A coverless steganography algorithm based on color image rotation mapping is proposed to solve the problem of poor robustness for stego image.The rotation mapping of true color image and false color image is used to embed the secret information,and a series of preprocessing operations are performed to reduce the redundancy of the image.The new pixels are generated by rotating the cover image by 45 degrees,and the mapping relationship between the new pixel information of the cover image and the pixel information of the stego image is established.Finally,the correctness of the algorithm is verified by theoretical analysis and experiment.(3)To solve the problem of poor robustness for stego image,a coverless steganography al-gorithm based on color image scaling mapping is proposed.The secret information is derived from the mapping relationship between the enlarged cover image and the reduced stego image.Firstly,the stego image is preprocessed.Secondly,the stego image is reduced by 4 times and the cover image is enlarged by 2 times to generate new pixels.Then a mapping relationship between the new pixel information of the cover image and the new pixel information of the stego image is established.Finally,the high security and embedding capacity of the algorithm are verified by theoretical analysis and experimental results.