Cyber warfare: Steganography vs. steganalysis

The comparison between steganography and steganalysis which represents an important part of 21st century cyber warfare with a profound influence on information security is discussed. Quantization Index Modulation (QIM) approach uses different quantizers to carry different bits of the secret data. Some embedding tools cause subtle changes in the set of possible values that may be taken by the pixel gray levels and transform coefficients. Latest embedding methods are devised that avoid creation of new colors to combat steganalytic tools based on analyzing the increase of unique colors in an image.