Digital image steganography method and secret information extraction method

Abstract

The invention relates to a digital image steganography method which is used for embedding a binary secret message S into an original carrier image Gc with the size of M x N. The digital image steganography method is characterized by comprising the following steps of: firstly calculating a steganography system B of the secret message; Dividing the original carrier image Gc into three continuous pixel group sequences Q which are not overlapped with one another; Converting the binary secret message S into a B-system secret message SB; Taking out a group of data from the three-pixel group sequenceQ according to a sequence; Taking out a bit of secret data dB from the B-system secret message SB according to a sequence; Determining a candidate pixel value field set [phi]B (x, y, z) of the three-dimensional space point (x, y, z), and parameters k1 and k2: searching the candidate pixel value field set [phi]B (x, y, z) to find out (x ', y', z '), and satisfying f (x', y ', z') = dB; Replacing (x, y, z) in the three-pixel-group sequence Q by using (x ', y', z ') to complete steganography embedding of the secret data dB; Compared with the prior art, the method has the advantages that a smaller mean square error can be obtained, and the non-perceptibility and safety of the steganographic image can be effectively improved.

Description

technical field [0001] The invention relates to a digital image steganography method and a secret information extraction method. Background technique [0002] After years of development, the steganography of digital images is becoming more and more perfect, but there is still room for improvement. In particular, steganalysis, the opposite of steganography, is also being continuously improved, which puts forward higher requirements for steganography. In order to ensure the security of covert communication, the imperceptibility and security of steganographic images are crucial performances. Therefore, many scholars have carried out extensive research. [0003] Since the steganographic capacity and image quality are a pair of contradictions, increasing the steganographic capacity will definitely increase the distortion of the steganographic image to a certain extent, degrade the image quality, and thus reduce the imperceptibility and security of the steganographic image. Ther...

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Problems solved by technology

[0003] Since the steganographic capacity and image quality are a pair of contradictions, increasing the steganographic capacity will definitely increase the distortion of the steganographic image to a certain extent, degrade the image quality, and thus reduce the imperceptibility and security of the steganographic image

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