Text Information Hiding Technique By The Carrier Of Song Poetry

In recent years,information communication has played an increasingly important role in human social activities with the rapid development of the Internet technology.Every day,a large number of confidential documents and private information are transported on the Internet.Consequently,how to ensure the secrecy of important information on the public network has become the social focus.As an important branch of information security,information hiding technology,which is of great importance in many aspects including national security and copyright and privacy protection,can hide the secret information in the public carrier for transmission.The Text Information Hiding Technology,with utilizing test data as a transmission carrier,has advantages of broad usage,easy transmitting and etc.In view of the defects of the previous text information hiding technology,such as the embedding rate,the concealment of carrier text,the security of system and so on,the thesis takes the Whole Song Poetry as a new information hiding carrier and proposes three text information hiding schemes.The detailed research results are as follows:1.In order to enhance both the concealment of current text information hiding technology and the embedding rate,the thesis proposes a novel text information hiding technology with the whole Song poetry(Song-Steg).We design the Song Poetry splitting and dictionary generation algorithm to process 2538 song poetries with moderate length under 140 Ci-Pai,which generates 32 rhythms including “Ping-Ze” and a rhythms dictionary with a capacity of more than 30000 words.The thesis formulates 140 Ci-Pai generating templates including “Man-Jianghong”,and proposes an information hiding and extraction algorithm that hides a piece of information in a Song poetry whose space and rhythms meet the specified Ci-Pai.Compared with the current proposal in the aspect of information concealment and embedding rate,the integrated embedding rate of this proposal is up to 27.1%.Also the Song Steg text is more similar with an ordinary Song Poetry,and the concealment is much better.2.To further improve the security of information hiding system,this thesis puts forward a secure text-information hiding scheme with Song Poetry,which is based on hybrid encryption.This scheme encrypts the original information with the Advanced Encryption Standard(AES);then it uses elliptic curve cryptography(ECC)to encrypt AES keys;finally,it uses the Song-Steg to hide the encrypted ciphertext and keys,and then generates some Song Poetries with a randomly selected or a specified Ci-Pai template.The average encryption and decryption time for 100 Chinese characters are 79.6 ms and 33.3 ms,and the embedding rate is up to 28.13%.It is difficult for an attacker to steganalyses and much more difficult to get the embedded information,and the security has been greatly improved.3.Aiming at further improving the readability of the carrier Song Poetry,this thesis puts forward Song Poetry text-information hiding scheme based on sentence pattern control.We remade the generating template by analyzing the relationship between rhyme and propecty of words in traditional Song Poetries,which produces a “rhythms-property” dictionary with more than 40000 words,including 4 parts of speech and 32 rhythms,by processing the dictionary with speech extraction algorithm.We proposes a Song Poetry hiding algorithm by using sentence pattern control.Results shows the hiding Song Poetry generated by this proposal is fluent,readable and better concealment in aspect of the information hiding and concealment.