A Fragile Watermark-Based JPEG Image Tampering Detection Method

Abstract

The invention discloses a JPEG image tampering detection method based on a fragile watermark. First, the JPEG image is decoded to obtain the number of brightness DCT blocks and the DCT quantization coefficients in each brightness block; a key K is used to generate a pseudo-random number matrix to make Each DCT block can be assigned a pseudo-random number; the pseudo-random number of each DCT block is combined with the DCT quantization coefficient to calculate a fragile watermark containing 16 bits of information; the watermark is embedded in the DCT quantization coefficient to obtain a JPEG image containing a fragile watermark . During inspection, decode the brightness block DCT quantization coefficient of the target image; generate a pseudo-random matrix with the key K; then calculate the fragile watermark in the same way; extract the watermark in the DCT quantization coefficient of the photo to be tested and compare it with the calculated fragile watermark, If they are not equal, it is determined that the DCT block has been tampered with, and when all the DCT blocks of the image have not been tampered with, it is determined that the JPEG image has not been tampered with.

Description

technical field [0001] The invention relates to the fields of information hiding, digital watermarking, digital forensics, and tampering detection, in particular to a JPEG image tampering detection method based on a fragile watermark. Background technique [0002] With the development of digital media and Internet technology, it has become more and more common for individuals or organizations to publish or disseminate digital images on the Internet. Digital images have thus become an increasingly important and common information carrier and digital credential. However, the emergence and widespread use of image editing software such as Photoshop and Meitu has made digital image content easy to be edited, tampered with or even forged. The characteristics of easy tampering and forgery of digital images make them face information security hidden dangers and trust crisis when they are used as digital certificates. Existing digital images often lack data integrity protection tec...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems in the prior art that the tampering position of the JPEG image cannot be clearly determined, and the fragile watermark of the picture is easily damaged, etc., and proposes a JPEG image anti-tampering method based on the fragile watermark, which is verified in units of blocks , compared with the traditional hash or digital signature, it can effectively locate the tampering position

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