A novel blind detector for additive noise steganography in JPEG decompressed images

This paper proposes a novel universal steganalyzer for additive noise steganography in JPEG decompressed images. On the basis of the influence of the message embedding on the statistical distributions of alternating current (ac) discrete cosine transform (DCT) coefficients, we first develop a new steganalytic feature which is defined as the ratio between different ranges of the normalized ac coefficients histogram. Then a powerful blind …