Targeted at the text steganography with mimic model

a steganalysis method based on source redundancy for stegotexts was proposed.This method processed the text and the words in it as the m-order Markov source and the source symbols respectively

then computed the redundancy of the source.Through analyzing the relationship between the re-dundancy and the size of the text

the existence of hidden information could be determined.With testing of 8 000 ste-gotexts produced by the four main softwares NiceText

Texto

Stego and Sams Big Play Maker

and 2 400 normal texts randomly sampled from innocuous texts downloaded from the Internet

the results show that the false positive rate of our steganalysis method is 0.5% and the false negative rate is 3.9%.Experiments and analyzing results indicate that the steganalysis method can effectively detect stegotexts based on natural language processing with mimic model.