Secure steganographic method

A new data hiding method completely secure against the first-order statistical attack is proposed. This method separates the selective and non-selective blocks first, selects the selective blocks next, and shifts the position of last non-zero AC coefficients to embed secret messages. Even after hiding data, non-zero JPEG coefficients remain unchanged. Since this method does not change the AC coefficients, but changes their positions, the produced histogram of the image after data hiding remains the same as that of original image.