In this paper, the information hiding technology is being discussed. In allusion to the deficiency of the steganography based on LSB, the authors advanced a arithmetic based on least histogram abnormality （LHA）. The theory of the LHA steganography and the detailed program of the whole process of LHA are introduced. The result of the program can illuminate that this arithmetic can exactly pick up the secret information. When the secret information is not too large, the LHA steganography has the ability of visual concealment and hidden statisti...
