Kenneth Sullivan Upamanyu Madhow Shivkumar Chandrasekaran B. S. Manjunath Steganalysis of spread spectrum data hiding exploiting cover memory. 38-46 2005 conf/sswmc/2005 Security, Steganography, and Watermarking of Multimedia Contents db/conf/sswmc/sswmc2005.html#SullivanMCM05