Research On Text Coverless Information Hiding Method Based On Multi-label And Multi-keyword

Information hiding technology is an important technology to ensure the security of information transmission in open channels.Usually,text information hiding technology is based on carrier modification to achieve information hiding,which is difficult to resist steganography detection.The coverless information hiding technology emphasizes that the dense carrier text is retrieved directly from the natural text database without modifying the carrier,so as to achieve information concealment,which is superior to the information hiding technology based on the modified carrier in terms of security.However,this technology still has the limitations of low hidden success rate,small hidden capacity,and high construction and maintenance cost of carrier library.This dissertation aims to solve the limitations of text-free information hiding technology,and the main work and innovation points are as follows:(1)A coverless information hiding method based on multi-label and multikeyword is proposed.Under the small-scale carrier library,the hidden success rate is low due to the existence of the label negotiation mechanism.Therefore,a multi-label mapping method based on tagged text features is designed,which uses labeled text to record label and label position information,so as to improve the success rate of hiding.At the same time,according to the correlation between words,the word combination method is introduced in the information hiding process,so that multiple keywords can be embedded after a single tag,thereby improving the hidden capacity.Experiments show that under the small-scale carrier text library,the hidden success rate of the proposed method can reach more than 90%,and the average single text can be embedded with 6.8 Chinese characters,while the hidden success rate of the traditional method is below 54%,and the average single text can be embedded with 4 Chinese characters,which proves the effectiveness of the proposed method.(2)A coverless information hiding method based on homophone Chinese characters and Chinese character component mapping is proposed.When the secret information contains non-traditional Chinese characters,it is usually necessary to expand the database to improve the hidden success rate and hidden capacity,which is more expensive.Therefore,based on the character characteristics of Chinese characters,this dissertation designs a homophone and Chinese character component mapping method,and maps them into homophones and homophones and homophones when embedding fails with Chinese characters,and embeds them respectively,so as to improve the hidden success rate and hidden capacity.Experiments show that the success rate of this method in hiding non-traditional Chinese characters increases from92% to 98%,and the hidden capacity increases from 6.8 Chinese characters to 7.6Chinese characters in a single text,which proves the effectiveness of this method.