Safe fragile watermarking method based on multiple dependency structures

Abstract

The invention discloses a safe fragile watermarking method based on multiple dependency structures. The method comprises a watermark embedding part and a tampering localization part, wherein the watermark embedding process specifically comprises the following steps of: a step 1 of segmenting an image file, a step 2 of generating a watermark, a step 3 of embedding the watermark and a step 4 of obtaining an image Y containing the water mark through the three steps; and an image authentication process specifically comprises the following steps of: a step 1 of generating the watermark, a step 2 of extracting the watermark and a step 3 of authenticating integrity. The method can accurately check the integrity of images, and can implement accurate location of tampering. Particularly, for isolated block tampering which cannot be detected by a conventional algorithm, the method has better detection and location effect, and the method encrypts the generated watermark, and selects an embedding position of the watermark through a chaotic sequence generated by a key, so that safety intensity of the method is improved.

Description

technical field [0001] The invention relates to an integrity authentication method of a digital image, in particular to the integrity authentication and tampering positioning of a digital image by using a fragile watermark method, and belongs to the field of information hiding and security. Background technique [0002] With the rapid development of computer information technology, people can store and transmit digital media economically, conveniently and efficiently. However, through special computer software, the content of digital media can be easily changed without being discovered by people. Once used by criminals, it will bring unnecessary losses. Therefore, the issues of information security and content security of digital media have become increasingly prominent. People need to study related technologies to effectively protect the authenticity and integrity of information content, so as to avoid illegal operations such as forgery and tampering of digital media by a...

AI Technical Summary

Problems solved by technology

However, this scheme has the following disadvantages: 1) the scheme appends the summary to the message and sends it together with the message, which increases the data volume of the file and correspondingly increases the burden of network transmission; high demands

4) Only the integrity of the data can be judged, and the cause of damage and the location of tampering can not be given

However, this type of method cannot detect tampering of isolated blocks. In fact, in some cases, this operation may change the content of the image, such as the minutiae information of the fingerprint image.

Images