We develop some methods for evaluating the security of lsb steganography using randomness test and two - dimension self - correlation function . 4 ) evaluation of the statistical visibility of information hiding algorithms 提出了基于二維自相關函數(shù)徑向譜和隨機性檢驗(包括順序檢驗、游程檢驗和一維自相關檢驗)的lsb信息隱藏安全性評估方法。
[ 3 ] the vowel ' s self - correlation function has periodicity and the period of this function is the fundamental sound period of this speech . according to this , we propose a method of adjusting the tone in temporal field by adding or deleting the sampling points in the waveform with the whole speech waveform unchanged ( 3 )根據(jù)元音自關函數(shù)具有周期性并且其周期就是語音基音周期這一特性,提出在保持語音波形總體不變的前提下,在語音時域上對語音進行插值或刪值的方法來調(diào)整音調(diào)。
The self - correlation function of the m sequence is divided into the self - correlation between all same address users and the mutual - correlation between all different address users . a computer simulation experiment , which 100 users are communicating under our method , is given in this paper . the information of every user is known before the processing of s - cdma communication start 論文在提出地址碼設計方案后,通過計算機仿真實驗,模擬一個用戶數(shù)為100的小區(qū),使用論文設計的地址碼方案進行s - cdma綜合業(yè)務通信,已預先知道每個用戶通信的信息,在計算機仿真通信處理完成后,檢驗在接收端的用戶信息。