PN Sequence Estimation and Spread-Spectrum Steganalysis
Chen Yang-kun · Dianzi xuebao · 2011
An efficient method that can estimate PN sequence of direct sequence spread spectrum(DS-SS) signal is presented in a non-cooperative context,on this base,spread-spectrum hidden message can be extracted blindly.At first,the optimization model with the cumulative correlation value between estimate sequence and SS signal as the objective function is established,and then the PN sequence can be estimated by Genetic Algorithm.Finally,by analyzing the correlation between PN sequence and stego-signal,the hidden messmate can be extracted.The method has been carried out on PC,the experimental results show that,PN sequence estimation performance of the low-SNR DS-SS signal is good,and the extracted hidden message can be identificated.