关键词: 安全密写, 模运算, 像素差值, 直方图

Abstract:

A new steganographic embedding technique based on pixel pairs is described. The proposed method involves two modulo operations on the difference between pixels in each pixel pair and the gray-value of a pixel, respectively, hence the name modulo gray-value modulo difference(MGMD). The number of bits to be embedded into each pair is determined by the pixel difference. The secret data and the results of two modulo operations are combined and used to modify the host pixel pair such that the gray level difference is kept unchanged. MGMD embedding causes no histogram abnormality as often encountered in other pixel pairbased techniques such as PVD and SM. It can also resist the popular RS and χ² analyses. Security of the method is confirmed in experiments on a large number of images.

Key words:

secure steganography, histogram